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EK-DZ110-UG-002

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Document:	DZ11 User's Guide
Order Number:	EK-DZ110-UG
Revision:	002
Pages:	56
Original Filename:

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EK-DZ110-UG-002

D211
user’'s guide

digital equipment corporation - maynard, massachusetts

Preliminary Edition, March 1977
Preliminary Edition (Rev), June 1977
1st Edition, September 1977
2nd Edition, February 1979

The drawings and specifications herein are the property of Digital Equipment
Corporation and shall not be reproduced or copied or used in whole or in part
as the basis for the manufacture or sale of equipment described herein without
written permission.

Copyright © 1977, 1979 by Digital Equipment Corporation
The material in this manual is for informational
purposes and is subject to change without notice.
Digital Equipment Corporation assumes no re-

sponsibility for any errors which may appear in
this manual.

Printed in U.S.A.

This document was set on DIGITAL’s DECset-8000
computerized typesetting system.

The following are trademarks of Digital Equipment Corporation,
Maynard, Massachusetts:
DIGITAL

DECsystem-10

MASSBUS

DEC

DECSYSTEM-20

OMNIBUS

PDP

DIBOL

OS/8

DECUS
UNIBUS

EDUSYSTEM
VAX
VMS

RSX

RSTS
IAS

CONTENTS

Page
- CHAPTER 1

GENERAL DESCRIPTION

1.1

INTRODUC I ION‘Q“*"'"**.'W"”“W»"‘U.*.'"flflfi'*"W"v"'\"".‘."*"’fl‘*.‘fl"“‘*""'. ***************** \.01| 1

1.2

PHYSICAL DESCRIPTION LA R RS AR RS AR R R

R R

Con flguratlons
A AA LA AR AR AR AR AR R R R A R R
1

A AR

R R

1.2.1

1.3
1.3.1

1.3.1.1
1.3.1.2

S SsR

I I mM T T ITMMT T fi‘fll 2

T I I I I I T I T I T, 1 3

GENERAL SPECIFICATIONS oo 18
Output‘s Q”"fllfi‘!00'0“"0."‘%"‘00!‘I‘Qfli#‘.#'l’.‘l*.‘U*'fi*flfi&flfi"*‘lQ‘W*flh*fi*’llfll!l*lmfib'.llfifi'!fl"lO‘".flll.‘flflw1 -;
DZ11-A, -B, and -E
’

DZ11-C, -E, and -F
’

’

LE 2 R BB
X LA S

LA
E N A B

RN ER] BERERA

E R Y

BRSNS LE

KB 8

] (L EE

R ERNE
RN’ LA

E T F

RN EEE]“’l* lllllllllllllllllllllll »

NI BEER

RN E DWW LA

RS R

R ZEEREEDN]

1-9
1-9

1.3.2
1.3.3

Power chmrcmcnts DZ11-A, -B, and E Ceievnaes eeresssrsetsreserenansernreressreranes 1-9

1.3.4

Power Requirements, DZ11-C, -D,and -F............cccceeevvviviivniniiiennieecnnenenn..
159

1.3.5

Environmental Requirements
- All Dles....eestsinestaesiannnsernnssseenersennestrasasan 1-10

1.3.6

1.3.7
1.3.8

1.3.9
1.3.10

1.4

1.4.1

Distortion- DZ11-A, -B, and-E ...... creeeereeenannas Ceveeeerieeens 1-10

Interrupts...... veerrnreereennans ceeeereeenanes verrneeerans Ceretaeerneeraeerteeeateaneaanns Ceereeeenns 1-10

LINE SPeed......coooiieiiiiiiieeeeieiei ererereerieseennnnneeennn
1210
Distance (DZ11-A,-B,and -E)..........ccooiviiiiiiiiiiieeeeeeeeee
e eeeeeeeeeeeeeeeens 1-11
Distance (DZ11-C, -D, and -F) .....ccooiiiiiiiiiiieieeeeeeeeeeeeeeeeeeeeeeeeeea
e 1-11
FUNCTIONAL DESCRIPTION ...t
eeeeeeeeeee e ee e 1-11
PDP-11 Unibus Interface.....

1.4.2

,
Control Logic............... terrreereneeaens feeeennerenneeeeteeeanaeetnran——aaetaeeraaetraneeraneeenns 1-12

1.4.3

Line Interface......................... cererrrnnas feeeeeteeeeertereeeettiaaetatreernnn
e rraaaas 1-13

CHAPTER 2

INSTALLATION

2.1

SCOPE AR
S E R R R RN A AL AR SR A AR R R A R R R R R R R R R R R BAREBEESEEDRNETE BT RN LA A EREEEERE
S NN LA RS AR E R E S R A RS R R R ST N E R R Y
CONI IGURATION DIFFERENCES LE RS E AL E RSSRR
SR RS NN LA R A R AR R R A R RS R R
RR
R R N R

2.2
2.3

UNPACKING AND INSPECIION
llllll LA A A RS A E R A R R R R R R R R A E R R R R R NN

24
24.1

24.1.1

24.1.2
24.2

243

EIA Optlon LA A AR R R AR R R AR
R R R A
R e sy T T T I MMM I T T LA R E XN
20 mA OptIOHOOflQ flflflflflfl LA AERER R R R R RS
EE R LA AR R A SRR R R RS R R R S R R R N
T R R RS
M7819 MOdUIe Installatlon UUUUUUUU HREPERERREE TR RN kR WHEEERNR SR ‘A AR S R R R R RS R R R R R Y - o e w
-

M7814 MOdulc Installatlon BERERADERBESR
BRI ES SRR R D ERRT ANERD
ER RSNRSB A Z B R A RSEENEEN] LA R A EREERE
RSN 2“6

CHAPTER 3

PROGRAMMING

3.1

INTRODUCTION........... ceereenreeeen et ereeea———— tertieteetassasaresarsissorararassesensras eeerens 3-1
Device and Vector Address Assignments ............. eerrerrrana. Ceeeareeeeans eeerereeann 3-1

3.1.1
3.2
3.2.1

Control and Status Register (CSR) ...............eeemeeraeeteeanrenntitennaennernstrnsnnsennns 3-2

322

Receiver Buffer (RBUF)......ccoooiuiiiiiiiiiiieeieeeeeeeeeeeeeeeeeeeeee
e e, ...3-6

323

Line Parameter Register (LPR)........cccvuviiieeeiiiieeeeeeieeeeena, e, 3-7

3.24

Transmit Control Register (TCR).........uvuveeiiiiiiiiiieeiieiiiiieeeeeeeeeeei 3-8

iii

CONTENTS (CONT)

Page

3.2.5
3.2.6

Modem Status Register (MSR).......ccoivriiieeeiiiiireeeeeeeirineeeeeeeeeesienneeeeeseenennes 3-9
Transmit Data Register (TDR) ..... reeresieshesnineitrarabonsstaberetasiectrannsetensennrensaseres 3-9

3.3
3.3.1
3.3.2
3.33
3.34
3.35
3.3.6
3.3.7

PROGRAMMING FEATURES
............ erererreeens Ceeeenteeeteeeenaeeennerennaetaaaaeanaaernnns 3-9
Baud Rate..................... veetsmasesiereeineeesinseniveseresivearseinrtstnteeranctonasarnserernsceansacen 3-9
Character Length.............. eeetttetertnrerneearhaeaaaeearaaraeararraneranarnnneerreennnaers 3-10
StoOp BitS...cvvuiiiiiiiiiiiiereeeeee s eeeereerereeeteneseearrareatnernraaeearnereannaaeees 3-10
Parity ..ccoovveviiiiiiiicciieneeceeees Ceeemeretteerntereteeetetanaeeteanetataeetetaaeeeneareenaaes 3-10
Interrupts....ccccveevvnievneennnnnn.eeeerrenese eeeteetereeteetierareee
e eeeetrtaeeaneeereannaaenns 3-10
Emptying the Silo ................. feesevteesuidiseetariernserasianssenrernasnaseseensenresenssnnansnenans 3-11
Transmitting a Character...........cooevvieiiniiiini, 3-12

PROGRAMMING EXAMPLES .......recrcevcve
eerreeerteeerreeernaans 3-13

APPENDIX A

DZ11 (M7814) TO AN ACTIVE DEVICE INSTALLATION

3.3.8

Data Set Control ..........cccoveveennnnne eeevdiesisnrsaasasans e eer et e e e et

—aeereeeeaeeans 3-13

)

FIGURES

Figure No.

1-1
1-2

1-3

1-4
1-5
1-6
1-7
1-8
2-1
2-2
2-3
2-4
2-5
3-1
A-1
A-2

Title

Page

DZ11 System ApPliCations ..........eeeeeeerrriiiiiiiiimmmiiee
e 1-1
DZ11 EIA Module (M7819), Distribution Panel (H317-E), Static Filter
(H7004C), and Cables (BCO6L-OJ and BCOSW-15) .....covviiiiniiiiiiiiiiiiiiiiinniicicenn, 1-2
DZ11 20 mA Module (M7814), Distribution Panel (H317-F), Static
|
Filter (H7004B), and Cables (BCO6K-OJ and BCO8S-15).......ccccuvvmmmiviiininiinnennnn. 1-3
DZ11 Hardware Interconnections..........ccceeevneees teerrrrrerneeaneen eeteernreneereerreeneraeernens 1-4
H3271 or H327 TurnaroUnd ........ccovviiueieuiirierneennenereeessesimeemstssssccssssnsenesssssnns 1-5
Test Connectors H327, H3190, H3271 and H325 ................................................. 1-6

H3190 Staggered Line Turnaround..........ccoocvveeeeeneenenen.rerete
e et ——————————— 1-7
General Functional Block Diagram .........cc.cooiiiiiiiiiiiiiiiiniini
e, 1-12
M7819 AdAress SEIECION .......oivvriiiiieeiiieiii
e
earereaeeeta s rneesrasesennseessnsennns 2-3
M7819 Vector Selection........ccuuveeeeiieieiiniineeereeeceerennnnes veessriresresiosertessasanenanseinsierenns 2-3
BCO5W-15 and BCO8S-15 INterconnNection ........cccuuveieeieimiiiinniimniieiirinniecereeennnenes 2-5

M7814 AdAress SEIECHION .....ccuuiviiieiiiiieiiriiierie
e eeeenec et s enn s rea e ens s e senesanseaas 2-6
M7814 Vector Selection........ccccceeeeeeeevennnnnnnnee eetaeeeeernreereraaeeerrataeerraraeeerrraeerarans 2-7
Register Bit Assignments........... Creceeneresonines Ceeeerreeenteeerrereennesatnraataaeetanreraneaernsaerannns 3-3
DZ11 (M7814) to Active Device CONNECLION .......ccceuvviiiiiiiniiiiiiiiiiiniieeeieieeeeees A-1
H319 Current Loop Receiver Schematic Diagram ............ eeeeersereeereeeeereaeernnaeeees A-2

TABLES

Table No.
1-1

1-2

2-1
2-2

3-1
3-2

3-3
3-4

Title

Page

DZ11 Model Configurations ...........uuueeeiieiireiiiiiiineieeciieniiieeeeetirnneae
e eereseranaaees 1-4
DZ11 Performance Parameters.........cccccevvvevevennnnnen. et eatenreeeetaenteereeerereerearenans 1-8
Items Supplied Per Configuration............cccccuuveennee. Ceeeereeteneeeesenaeeeettrnaeeeraeieaeaans 2-2
DZ11 to Terminal Wiring (Using BCO4R Cable) ....... eereeeeees eeereereeenterararerneres ...2-8
CSR Bit Functions........ vereenees Ceeeneteeeseenetaetaeeaebeenetaetnraneatrreernrreanernennns ceerrerreenenssd=S
RBUF Bit Functions..........cc.c...... e teeeretreneerernerernaenernes e tetertereenetnererenererearraaans 3-7
LPR Bit Functions.................. eereens errerene et teeneeaeteeneeneeeeteth
e taeteheenernerasrerarnern 3-8
Baud Rate Selection CRaTt.......ovuieiiiiiiiiiiiiiieiiiiiiieetiieeteeessrereseenesrensaceresnsnsenes 3-10

CHAPTER 1

GENERAL DESCRIPTION

The DZ11 is an asynchronous multiplexer that provides an interface between a PDP-11 processor and
eight asynchronous serial lines. It can be used with PDP-11 systems in a variety of applications that
include communications processing, time-sharing, transaction processing, and real-time processing.
Local operation to terminals or computers is possible at speeds up to 9600 baud using either EIA
RS232C interfaces or 20 mA current loop signaling. Remote operation using the public switched
telephone network is possible with DZ11 models offering EIA RS232C interfaces. Enough data set
control is provided to permit dial-up (auto answer) operation with modems capable of full-duplex*
operation such as the Bell models 103 or 113 or equivalent. Remote operation over private lines for
full-duplex* point to point or full-duplex* multipoint as a control (master) station is also possible.
Figure 1-1 depicts several of the possible applications for the DZ11 in a PDP-11 system.

LOCAL

REMOTE

| . TELEPHONE
7 LINE

»| REMOTE

———g—— =

TELEPHONE

.
U le

DZ 11

SYSTEM e —

"] TERMINAL

P“T“ SeY

LINE
A
Bt AT

27 1 svstem

|‘;"1‘5’§f {

—_PDP-11

|
w

COMPUTER
A

o
oot
A

11-4332

Figure 1-1

DZ11 System Applications

*The DZ1 IW data set control does not support half-duplex operations or the secondary transmit and receive

operations available with some modems such as the Bell model 202, etc.

1-1

The DZ11 has several features that provide flexible control of parameters such as baud rate, character
length, number of stop bits for each line, odd or even parity.for each line, and transmitter-receiver
interrupts. Additional features include limited data set control, zero receiver baud rate, break generation and detection, silo buffering of received data, module plug-in to hex SPC slots, and line turnaround.

Each DZ11 module provides for operation of eight asynchronous serial lines. Since the module interfaces to these channels with a 16-line distribution panel, 2 DZ11 modules can be used with 1 panel.
Also note that the two versions of the DZ11 (EIA or 20 mA output) consist of different module and
panel types. This fact allows a system to mix EIA and 20 mA by using multiple DZ11s.
The DZ11 (8-line configuration) comprises a single hex SPC module and a 13.34 cm (5.25 in), unpowered distribution panel, connected by a 4.6 m (15 ft) ribbon cable. Several types of interconnecting
cables are used between the distribution panel and the modem or terminal, depending on the device. A
16-line configuration uses two modules and a single distribution panel connected by two ribbon cables.
The DZ11 modules, cables, static filters,* and distribution panel are shown in Figures 1-2 and 1-3. The
subsequent paragraphs present a detailed description of the physical and electrical specifications of the
various DZ11 options and configurations.

DZ11 (M7819-EIA)

CABLE

(BCOSW-15)

__ STATICFILTER

{(H7004C)

CABLE

(BCO6BL-0J)

DISTRIBUTION PANEL
(H317-E)

8884-1

Module (M7819), Distribution Panel (H317-E), Static Filter (H7004C),
and Cables (BC06L-0J and BCO5W-15)
*Static filters are not supplied with earlier modules.
5

1-2

DZ11 (M7814-20MA)

CABLE

(BCO8S-15)

STATIC FILTER

- {(H7004B)

__CABLE

(BCOGK-0J)

DISTRIBUTION PANEL
(H317-F)

8884-2

Figure 1-3 DZI11 20 mA Module (M7814), Distribution Panel (H317-F), Static Filter (H7004B),
and Cables (BCO6K-0J and BCO08S-15)

1.2.1

DZ11 Configurations

The DZ11 can be supplied in six different configurations, each designated by a suffix letter (A-F). The
DZ11-A and the DZ11-B options are EIA devices with partial modem control. The DZ11-E is the
combination of a DZ11-A and a DZ11-B. The DZ11-C and the DZ11-D are 20 mA loop output
versions. The DZ11-F is the combination of a DZ11-C and a DZ11-D. Table 1-1 lists the various

option configurations and Figure 1-4 shows the required hardware for the various configurations.

The DZ11-A and DZ11-B each use an M7819 module that plugs into slot 2 or 3 ofa DD11-B or any
system unit with a hex SPC slot; however, slotsin the PDP-11/20 BA11 box cannot be used. The
H317-E distribution panel pmwdm 16 communication lines from 2 M 7819 modules (8 lines per module) and is included with the DZ11-A and DZ11-E configurations. The H317-F distribution panel
provides 16 lines for the DZ11-C and DZ11-F configurations, which use the M7814 modules (20 mA
system). The distribution panels require no power and can be mountedin an H960 48.26 cm (19 in)
cabinet. Static filters (H7004C, EIA, and H7004B, 20 mA) are used to prevent problems caused by
electrostatic discharge. A 50-conductor, flat, shielded cable, BCOSW-15, connects from the M7819
module to the static filter. Cable BCO6L-0J connects the static filter to the EIA distribution panel. A
40-conductor, flat, shielded cable, BCO8S-15, connects from the M7814 module to the static filter.
Cable BC0O6K-0J connects the static filter to the 20 mA distribution panel.

PDP-11

DZ11-A

M7819

| (spc sww

r———

b (spc sLom)|

~ pzi-]
[ _m781a

|[IsPC sLoT)

BCOBS-15—

HTOOackl

;mmuwm)

| l | H7oc

| H70048

'acnam——jg

LINES ——16

i1l

DATA

EQUIVALENT

' o21-¢ ‘i
l M7814|

"
o (

<« BCOSW\" (EIA (im

-« BCOSDTM
103A OR

UNIBUS

L—

i’l

TERMINAL

8 LINES

H317-F

LINES ——»16

|e—BcO3M
TM
LOCAL

SET

8 LINES

l l 1

1
'

'
'

1101J

~_ CUSTOMER
SUPPLIED
CABLE

LOCAL

TERMINAL

TO TELEPHONE
LINES

NOTE
#* Not included with DZ11, must be
ordered separately.

»%x DZ11-E
= DZ11-A and DZ11-8

11-4333

DzZi1-F=DZ11-C and DZ211-D

Figure 1-4

DZ11 Hardware Interconnections

Table 1-1

DZ11 Model Configurations
Test

Model

Output

DZ11-A | EIA

Module

Panel

Connector

M7819

H317-E | H325/H327

M7819
H327
M7819(2) | H317-E | H325/H327
M7814
H317-F | H3190
M7814
H3190
M7814(2) | H317-F | H3190

NOTES

Static

Cables

Filter

BCO5W, BCO6L

H7004C

BCO5W, BCO6L
H7004C
BCO5W (2), BCO6L (2) | H7004C
BCO08S, BCO6K
H7004B
BCO08S, BCO6K
H7004B
BCO08S (2), BCO6K (2)
| H7004B

H327 will be replaced by H3271 in later units.
H3190 is not supplied with early units. The shipping
list will indicate which test connector, if any, is supplied.
H7004C, H7004B, BCO6L, and BCO6K are not supplied with early units. The shipping list will indicate
which static filter and cable, if any, are supplied.

Modems or terminals are connected to the H317-E EIA panel by cables that attach to 16 DB25P cinch
connectors. These cables are not provided with the DZ11. The BC0O5D-25 cable is recommended for
data set interconnections, and the BCO3M cable is recommended for local terminal interconnections.
The BCO5W-15 cable carries the data and control signals for all eight lines. Connections between
terminals and the H317-F 20 mA panel are by customer-supplied cables to 16 (4-screw) terminal strips.
The data signals for all eight lines are carried to the distribution panel by the BC08S-15 cable.
Two accessory test connectors, H325 and H3271*, are provided with each DZ11-A. The H325 plugs
into an EIA connector on the distribution panel or on the end of the BCO5D cable to loop back data
and modem signals onto a single line. The H3271 connects to the module with the BCO5W cable (two
M 7819 modules can be connected to one H3271) and stagge:rs the data and modem lines as shownin
Figure 1-5. The connectors are shownin Figure 1-6.

The 20 mA (M7814 module) options also havc a staggcred turnaround connector (H3190%). The
H3190 connects to the M7814 using the BCO8S cable and staggers the lines as shown in Figure 1-7.

A priority level 5 insert plugs into a socket on the M7819 or M7814 module to establish interrupts at
level 5 on the Unibus.

Maximum configuration allows 16 DZ11 modules per Unibus.

TRANS @

* REC 1

DTR @

-+ R 1
> CO 1

RI @

REC @

‘

S—

et DTR 1

> TRANS 1

NOTE:

Lines 283, 48 50and 6 8 7 are

staggered the same way.

11-4334

Figure 1-5

H3271 or H327 Turnaround

*This is a new item replacing the H327. The H327 may be used until the H3271 becomes available. The H327

plugs directly into J1 on the M7819 module.

+This is a new item; check the shipping list for availability.

1-5

Hif

H327

i »{'k

.
..
D
Q

o(n&)fl

o
i

8639-1

Figure 1-6

Test Connectors H327,

3190, H3271, and H325

20MA LOOP

AMA

O
LINE

TRANSMITTER

W
e

o—

’

!
e

LINE 1

RECEIVER

‘L,

20MA LOOP
O

1
LINE

TRANSMITTER

/ l>
D

LINE O

RECEIVER

) 4
»

LINES 2 & 3, 4 & 6, AND 6 & 7 ARE STAGGERED THE SAME WAY
11-5141

Figure 1-7

H3190 Staggered Line Turnaround

1.3 GENERAL SPECIFICATIONS
The following paragraphs contain electrical, environmental, and performance specifications for all
DZ11 configurations. Table 1-2 lists the performance parameters of the DZ11.

Table 1-2

DZ11 Performance Parameters

Parameter

Description

Operating Mode

Full-Duplex

Data Format

Asynchronous, serial by bit, 1 start and 1, 1-1/2 (5-level codes only), or 2
stop bits supplied by the hardware under program control

Character Size

5, 6, 7, or 8 bits; program-selectable. (Does not include parity bit.)

Parity

Parity is program-selectable. There may be none, or it may be odd or even.

Bit Polarities

Unibus

Interface

EIA Out

20 mA Loop

Data Signal

Low =1
High =0

High =1
Low =0

Low = 1 = Mark
High = 0 = Space

0-5mA
15-20 mA

Control Signal

Low = 1
High =0

High = 1
Low =0

Low = OFF
High = ON

Order of Bit

Transmission /reception low-order bit first

Baud Rates

50, 75, 110, 134.5, 150, 300, 600, 1200, 1800, 2000, 2400, 3600, 4800, 7200,
and 9600

Breaks

Can be generated and detected on each line

Throughput

21,940 characters/second = (bits/second X No. Lines
X direction)/(Bits/Character)

Example: (9600 X 8 X 2)/7 = 21,940 characters/second
NOTE
The theoretical maximum is 21,940. A ctual throughput depends on other factors such as type of CPU,
system software, etc.

1.3.1

Outputs

1.3.1.1 DZ11-A, -B, and -E - Each line provides voltage levels and connector pinnings that conform
to Electronic Industries Association (EIA) standard RS232C and CCITT recommendation V.24 The
leads supported by this option are:*
Circuit AA (CCITT 101)
Circuit AB (CCITT 102)
Circuit BA (CCITT 103)
Circuit BB (CCITT 104)
Circuit CD (CCITT 108.2)
Circuit CE (CCITT 125)
Circuit CF (CCITT 109

Pin 1
Pin 7
Pin 2
Pin 3
Pin 20
Pin 22
Pin 8

Protective Ground
Signal Ground
Transmitted Data
Received Data
Data Terminal Ready
Ring Indicator
Carrier

NOTE
Signal ground and protective ground are connected.

1.3.1.2 DZ11-C, -D, and -F - Each line is a 20 mA current loop used for connection to local terminals. (No data set control is provided.) All lines are active and, therefore, can only drive a passive
device. However, a pair of H319 20 mA receivers for each line may be used to convert from active to
passive operation in order to allow the DZ11 to drive an active device. Refer to Appendix A for
connection details.

1.3.2 Inputs
The PDP-11 Unibus is the input for all DZ11s. The DZ11-A, -B, -C, and -D present one unit load to
the Unibus and the DZ11-E and -F present two unit loads to the Unibus. Four ac loads per module are
presented to the Unibus in the EIA version and five ac loads per module are presented in the 20 mA
version.

1.3.3

Power Requirements, DZ11-A, -B, and -Et
~ Typical

(A)

2.2
0.13
0.1

1.3.4

Maximum

(A)

2.5
0.15
0.13

at +5.0 Vdc
at-15.0 Vdc
at +15.0 Vdc

Power Requirements, DZ11-C, -D, and -F¥

Typical

Maximum

(A)

2.1
0.4
0.12

2.3
0.42
0.15

at +5.0 Vdc
at-15.0 Vdc
at +15.0 Vdc

*Circuit CA (CCITT 105 - Request to Send) is connected to circuit CD (DTR) through a jumper on the distribution panel. This allows control of the Request to Send line for full-duplex modem applications that use the RTS
circuit.

+DZ11-E and DZ11-F are twice the above given values.

1-9

1.3.5

Environmental Requirements — All DZ11s

Class C Environment Operating

5° to 50° C* (41° to 122° F)

Temperature

Relative Humidity

10 to 95%, with a maximum wet bulb of 32° C (90° F) and a

minimum dewpoint of 2° C (36° F)

Cooling

DZ11-A, -B, -C, and -D
DZ11-E and -F

Heat Dissipation

DZ11-A and -B
DZ11-E
DZ11-C and -D
DZ11-F

1.3.6

Air flow 1.416 1/second (3 cu. ft/min)
Air flow 2.832 1/second (6 cu. ft/min)
3.99 g-cal/second (57 Btu/hr)
7.98 g-cal/second (114 Btu/hr)
3.85 g-cal/second (55 Btu/hr)
7.7 g-cal/second (110 Btu/hr)

Distortion - DZ11-A, -B, and -E

The maximum *‘space to mark” and “mark to space” distortion allowed in a received character is 40
percent.

The maximum speed distortion allowed in a received character for 2000 baud is 3.8 percent. All other
baud rates allow 4 percent. The maximum speed distortion from the transmitter for 2000 baud is 2.2
percent. All other baud rates have less than 2 percent.
1.3.7

Interrupts

RDONE

Occurs each time a character appears at the silo output.

Silo Alarm. Occurs after 16 characters enter the silo. Rearmed by reading the

TRDY

silo. This interrupt disables the RDONE interrupt.

Occurs when the scanner finds a line ready to transmit on.
NOTE

There are no modem interrupts.

Normally, a level 5 priority plug is supplied. The interface level can be modified to level 4, 6, or 7 by
using the proper priority plug.
1.3.8

Line Speed

The baud rate for a line (both transmitter and receiver) is program-selectable. Also, the receiver for
each line can be individually turned on or off under program control. (See Table 1-2 for a list of
available baud rates.)

*Maximum operating temperature is reduced 1.8° C per 1000 meters (1.0° F per 1000 feet) for operation at
|

altitudes above sea level.

1-10

1.3.9 Distance (DZ11-A, -B, and -E)
The recommended distance from computer to DZ11 is 15 m (50 ft) at up to 9600 baud with a BCO5D
cable or equivalent. Operation beyond 15 m (50 ft) does not conform to the RS232C or CCITT V.24
specifications. However, operation will often be possible at greater distance depending on the terminal
equipment, type of cable, speed of operation, and electrical environment. Reliable communication
over long cables depends on the absence of excessive electrical noise. For these reasons, DIGITAL
cannot guarantee error-free communication beyond 15 m (50 ft). However, the EIA versions of the
DZ11 may be connected to local DIGITAL terminals and most other terminals at distances beyond 15
m (50 ft) with satisfactory results if the terminal and computer are located in the same building, in a
modern office environment. Shielded twisted pair wire (Belden 8777 or equivalent) is recommended
and is used in the BCO3M null modem cable.
With cables made with shielded twisted pair wire, such as the Belden 8777, the following rate/distance
table may be used as a guide. This chart is for informational purposes only and is not to be construed
as a warranty by Digital Equipment Corporation of error-free DZ11 operation at these speeds and
distances under all circumstances.

90 m (300 ft) at 9600 baud
300 m (1000 ft) at 4800 baud
300 m (1000 ft) at 2400 baud
900 m (3000 ft) at 1200 baud
1500 m (5000 ft) at 300 baud
NOTE
The ground potential difference between the DZ11
and terminal must not exceed 2 V. This requirement
will generally limit operation to within a single building served by one ac power service. In other cases, or
in noisy electrical environments, 20 mA operation
should be used.
1.3.10 Distance (DZ11-C, -D, and -F)
The length of cable that may be used reliably is a function of electrical noise, loop resistance, cable
type, and speed of operation. The following chart is given as a guide; however, there is no guarantee of
error-free operation under all circumstances.
Speed (Baud)

9600
4800
2400

1200 and below

Belden 8777, 22 AWG,

22 AWG, 4 conductor

shielded, twisted pairs
(shields floating)
(DECP/N 9107723)

inside station wire
(DEC P/N 9105856-4)-

150 m (500 ft)
300 m (1000 ft)
600 m (2000 ft)

300 m (1000 ft)
540 m (1800 ft)
900 m (3000 ft)

1200 m (4000 ft)

1500 m (5000 ft)

1.4 FUNCTIONAL DESCRIPTION
;
The following paragraphs present a general description of DZ11 operation. Figure 1-8 is a general
functional block diagram that divides the DZ11 into three basic components: Unibus interface, control
logic, and line interface.
|

[controL

DATA

U
N| ADDRESS
L

;

PDP-11
INTERFACE

CONTROL
-

—I

SCANNER

""""‘"L—"']

]

REGISTERS

N B

LINE
INTERFACE

"
SRRy

F
8 s

mmm

__1
11-4335

Figure 1-8

General Functional Block Diagram

1.4.1
PDP-11 Unibus Interface
The PDP-11 Unibus interface component of the Dle handles all transactions between the Unibus
and the DZI11 control logic. The Unibus interface performs three functions: data handling, address
recognition, and mterrupt control. In its data handling function, the interface routes data to and from
the various registers in the control logic and provides the voltage condltmmng necessary to transmit
and receive data to and from the PDP-11 Unibus. The address recognition and control logic activates
the proper load and read signals when it recognizes its presclected address on the Unibus. These signals
are used by the data handling function to route theimcommg and outgomg data to the desired locations. The interrupt control function initiates and controls mterrupt processing between the DZ11 and
the PDP-11 processor.

1.4.2 Control Logic
The control logic provides the required timing and control signals to handle all transmitter and receiver operations. The control logic can be divided into two major sections: the scanner and the registers.

The scanner contmuausly examines each linein succession and, based on information from the line
interface and the reglsters generates signals that cause data to flaw to or from the appropriate line.
The scanner comprises a 5.068 MHz oscillator (clock), a 64-w0rd FIFO receiver buffer a 4-phase
clocking network, and other control generating logic.

The DZ11 uses four device registers in a manner that yields
six unique and accessible registers, each
having a 16-bit word capacity. The six discrete registers tempora
rily store input and output data,
monitor control signal conditioning, and establish DZ11 operatin
g status. Depending on their functions, some of the registers are accessible in bytes or words; others
are restricted to word-only operation. Registers can be read or loaded (written), depending on the
operation. The ability to read or
write a register allows the use of two of the device registers
as four independent registers.
1.4.3

Line Interface

Two of the most important operations in the DZ11 are the convers

ions from serial-to-parallel and

parallel-to-serial data formats. These conversions are required
since the DZ11 is located between the
PDP-11 Unibus (a parallel data path) and either local terminal
s or telephone lines (serial data paths).

Conversions for each line in the DZ11

are performed by independent universal asynchronous receiver-

transmitter (UART) integrated circuits. Another component

of the line interface, the line receiver or

driver, converts the TTL voltage levels in the DZ11 so that they correspo
nd to those in the external
device input lines (modem or terminal).

CHAPTER 2

INSTALLATION

2.1 SCOPE
This chapter contains the procedures for the unpacking, installation, and initial checkout of the DZ11
Asynchronous Multiplexer.

2.2 CONFIGURATION DIFFERENCES
The DZ11 can be supplied with or without a distribution panel. The DZ11-B and -D do not have
distribution panels. The following list describes the variations.
DZ11-A
DZ11-B
DZ11-C
DZ11-D
DZ11-E
DZ11-F

EIA level conversion with distribution panel (8 lines)
EIA level conversion without distribution panel (8 lines)
20 mA loop conversion with distribution panel (8 lines)
20 mA loop conversion without distribution panel (8 lines)
DZ11-A and DZ11-B (16 lines)
DZ11-C and DZ11-D (16 lines)

2.3 UNPACKING AND INSPECTION
The DZ11 is packaged in accordance with commercial packaging practices. First, remove all packing
material and check the equipment against the shipping list. (Table 2-1 contains a list of supplied items
per configuration.) Report damage or shortages to the shipper immediately and notify the DIGITAL
representative. Inspect all parts and carefully inspect the module for cracks, loose components, and
separations in the etched paths.
2.4 INSTALLATION PROCEDURE
The following paragraphs should be followed to install the DZ11 option in a PDP-11 system.

2.4.1 H317 Distribution Panel and Static Filter Installation
Install the H317 distribution panel and static filters according to unit assembly drawing D-UA-DZ110-0.
2.4.1.1 EIA Option - For the DZ11-A or DZ11-E option, check to ensure that all of the machineinsertable jumpers on the distribution panel are in place. (See Drawing E-UA-5411928-0-0 for jumper

locations.) These jumpers are in anticipation of future use of the DZ11 with modems other than the
103; however, two of the jumpers are now functional. The jumper labeled DTR (refer to D-CS5911928-0-1) connects DTR to pin 4 or Request to Send. This allows the DZ11 to assert both DTR
and RTS if using a modem which requires control of RTS. The jumper labeled BUSY is also connected
to the DTR lead for use in modems that implement the Force Busy function. This jumper should
normally be cut out unless the modem has the Force Busy feature and the system software is implemented to control it.

R R

xx**i‘ix *xx

X
MMM
MM

e
e
e
e
i
e
e
e
e

PEXRK

=
OXX|
o

K EX K R

»< X

VORI

VDS

—

M7819 module
H7004C static filter (EIA)
H3271 test connectort
BCO06L-0J filter cable (EIA)
H317-E distribution panel assembly
H325 test connector
BCO5W-15 cable
Print set (B-TC-DZ11-0-6) DZ11, A, B,and C
order number
MP00132
Software kit
Panel and static filter mounting hardware set
Priority insert (5)
DZ11 User’s Manual (EK-DZ110-OP-01)
M7814 module
H7004B static filter (20 mA)
BCO8S cable
- BC06K-01J filter cable (20 mA)
H317-F distribution panel assembly
Print set (B-TC-DZ11-0-11)DZ11,C, D, and F
order number
MP00253
H3190 test connector}

Description

AKX

Quantity

Items Supplied Per Configuration

Table 2-1

*Shipment contains two of the items listed.

tNew item: An H327 will be s.hlppcd with each M7819 unit until the H3271 becomes available. The shipping list

will indicate which test connector is supplied.

iNew item: The shipping list will include the H3190 test connector when supplied.

2.4.1.2 20 mA Option - For the DZ11-C or DZ11-F option, refer to D-UA-5411974-0-0. Each line
has a jumper on the distribution panel (W1 through W16) which should be in if the terminal operates
at 300 baud or less. The jumper should be removed for higher baud rates.

2.4.2 M?7819 Module Installation
To install the M7819 module, perform the following procedure.
1.

Ensure that the priority insert (level 5)is properly seatedin socket E52 on the M7819 module(s). (Refer to drawing D-UA-M7819-0-0.)
|
Refer to Paragraph 3.1.1 for descriptions of the address assignments. Set the switches at E81
so that the module will respond to its assigned address. When a switchis closed (on), a
binary 1 is decoded. When a switchis open (off), a binary 0 is decoded. Note that the switch
labeled 1 corresponds to bit 3, 2 corresponds to bit 4, etc. (See Figure 2-1.)
|

A12

A1l

A10

N
|

OFF

NOTE:
%

Address 160000 - A12 through A3,

OFF

160010 - A12 through A4, OFF;
177770
- A12 through A3, ON

A3, ON

(OFF= LOGICAL @, ON=LOGICAL 1)
MSB

51|

13|12|1n|lwo|o|8|7]|6|5]|a|s|2]:1

*
l

SWITCHES

o X | x | x l

)

6 OR 7

2 TO7

(DZ11 REGISTERS)
11-4563

Figure 2-1

M7819 Address Selection

Vector selection is accomplished by the 8-position switch at E11. Switch positions 1 and 8
are not used. Switch position 2 corresponds to vector bit 3, 3 corresponds to vector bit 4, etc.
When a switch is closed (on), a binary 0 is decoded. When a switch is open (off), a binary
1is
decoded. Note that this is opposite of the address switch decoding. (See F igure 2-2.)

OFF

ON
|

E11

OFF

NOTE:

LOGICAL 0

OFF

LOGICAL 1

VECTOR

310

OFF

OFF OFF OFF

OFF

300

770

OFF

OFF OFF ON

OFF
11-5314

Figure 2-2

M?7819 Vector Selection

2-3

If the DZI11 is supplied with the H3271 test connector, perform step 4. If the H327 test
connector is supplied, go to step 5.

Insert the module(s) into an SPC slot and connect the flat shielded cable (BCOSW-15),

ribbed side up, to J1 on the module(s). Connect the other end of the cable, ribbed side
up, to the H3271.*
CAUTION
Insert and remove modules slowly and carefully to
avoid snagging module components on the card
guides and changing switch settings inadvertently.

Run the DZI11 diagnostic in staggered mode to verify module operation. Refer to
MAINDEC-11-DZDZA, the diagnostic listing. Run at least two passes without error.

Remove the BCO5SW-15 cable(s) from the H3271 and install the cable(s) (with smooth

side up) to the static filter socket(s) on the back of the H317-E distribution panel. Refer
to D-UA-DZI11-0-0 and Figure 2-3.
Proceed to step 8.

Install the H327 test connector in J1 (the cable connector at the top of the M7819) and align
arrows for proper connection.

Insert the M7819in its SPC slot and run the DZ11 diagnosticin the staggered mode to verify
module operation. Refer to MAINDEC-11-DZDZA, the dxagnostlc listing for the correct
procedure. Run at least two passes without error.
CAUTION
Insert and remove modules slowly and carefully to
avoid snagging module components on the card
guides and changing switch settings inadvertently.

Replace the H327 test connector with the BCOSW-15 cable and observe the same caution as
in step 6. Install the other end of the cable at the static filter socket on the back of the
distribution panel. Refer to Figure 2-3 and D-UA-DZ11-0-0.

Connect the H325 (or H315) test connector on the first line and run the diagnostics in
external mode. The test connector may be installed on the H317-E distribution panel or on
the end of a BCO5D cable.
Repeat this step for each line.

Run DEC/XI11 system exerciser to verify the absence of Unibus interference with other

system devices.

*The H3271 has connections for two H7819 cables.

STATIC
y

FILTER SOCKET

SMOOTH
SIDE

BCOSW-15

CABLE

OR
BCO8S-15 CABLE

RIB
SIDE

(0\

OUTPUT BOARD

11-4327

Figure 2-3

10.

BCO05W-15 and BC08S-15 Interconnection

The DZ11 is now ready for connection to external equipment. If the connection
is to a local
terminal, a null modem cable must be used. Use the BCO3M or BCO3P null
modem cables
for connection between the distribution panel and the terminal. The H312-A null
modem
unit may also be used with two BCOSD EIA cables (one
on each side of the null modem
unit). If connection is to a Bell 103 or equivalent modem, a BCO5D cable is required
between
the distribution panel and the modem. All of the cables mentioned must
be ordered separately as they are not components of a standard DZ11 shipment. When possible,
run the
diagnostic in echo test mode to verify the cable connections and the terminal equipment
.

2-5

2.4.3 M7814 Module Installation
To install the M7814 module, perform the following procedure.

Ensure that the priority insert (level 5) is properly seatedin socket E41. Refer to D-UAM 7814-0-0.

Refer to Paragraph 3.1.1 for a description of address assignments. Set the switches at E72 so
that the module will respond to its assigned address. When a switch is closed (on), a binary 1
is decoded. When a switch is open (off), a binary 0 is decoded. Note that the switch labeled 1
corresponds to bit 3, 2 to bit 4, etc. (See Figure 2-4.)

A12

A1l

OFF

T e B

NOTE:

Address 160000
- A12 through A3,

OF F

160010
- A12 through A4, OFF;

A3, ON

177770
- A12 through A3, ON

(OFF:=LOGICAL @, ON=LOGICAL 1)
MSB

LSB

SWITCHES

6 OR 7

@ TO07

(DZ11 REGISTERS)
11-4562

Figure 2-4

M7814 Address Selection

Vector selection is accomplished by an 8-position switch at E81 on the module(s). When a

decoded. Note that this is the opposite of the address switch decoding. Also, note that switch
positions 7 and 8 are not used and switch 6 corresponds to bit 3, 5 to bit 4, etc. (Refer to

switch is closed (on), a binary 0 is decoded. When a switch
is open (off), a binary 1 is

F:gure 2-5.)
CAUTION
Insert and remove modules slowly and carefully to
avoid snagging module components on the card
guides and changing switch settings inadvertently.

2-6

OFF

NOTE:

LOGICAL O

OFF

LOGICAL 1

VECTOR

300

OFF

310

OFF

7:70

OFF

OFF OFF OFF

OFF

11-5140

Figure 2-5

M7814 Vector Selection

Insert module(s) into their assigned SPC slot(s). Connect the BCO8S cable, with ribbed side
up, to J1 on the module(s).
|

Skip this step if you have an H3190 test connector; otherwise perform the following.
a.

Connect the other end of the BCO8S cable to the static filter on the back of the distribution panel (H317-F) with smooth side up. Refer to Figure 2-3 and D-UA-DZ11-0-0.

Run the DZI1 diagnostic in internal (maintenance) mode for two error-free passes.
Refer to MAINDEC-11-DZDZA, the diagnostic listing, for the proper procedure.

Proceed to step 9.

Connect the other end of the BCO8S cable, with smooth side up, to the H3190 test connector.

Run the DZ11 diagnostic in staggered mode for two error-free passes.. Refer to MAINDEC11-DZDZA, the diagnostic listing, for the correct procedure.

Remove the BCO8S cable from the H3190 test connector and plug it into the static filter

socket
on the back of the distribution panel (H317-F) with smooth side up. Refer to Figure
~2-3 and D-UA-DZ11-0-0.
|
|
|

Run the DEC/X11 system exerciser to verify the absence of Unibus interference with other

system devices.

2-7

10.

The DZ11 is now ready for connection to passive external equipment. This is accomplished
with a customer-supplied cable. Most DIGITAL terminals use a BCO4R cable as shown in
Figure 2-6. Table 2-2 shows terminal connections for connecting VTO05, LA30, or LA36 to
DZ11. Run an echo test to verify terminal connections.
NOTE
For customer terminals that can only transmit or receive in a single direction, the echo test cannot be
run.

If the DZ11 is to be connected to an active device, a pair of H319s are required. Refer to
Appendix A for details on this connection.

11-2700

Figure 2-6

Table 2-2

BCO04R Cable

DZ11 to Terminal Wiring (Using _BC04R‘Cable) ’
VTO0S5 Wiring

Mate-N-Lok
5
2
3
7

VTO05

Signal

|
"

Terminal +RCV
Terminal —RCV
Terminal —XMIT
Terminal + XMIT

2-8

- Color
Black
White
Green
Red

D711

Terminal No.
4 (XMIT++)
3(XMIT-)
2 (REC-)
1 (RECH)

Table 2-2

DZ11 to Terminal Wiring (Using BCO4R Cable) (Cont)

LA30, LA36 Wiring

Mate-N-Lok
5
2
3
7

'LA30,LA36

DZ11

Signal

Color

Terminal No.

Terminal +XMIT
Terminal —XMIT
Terminal —REC
Terminal +REC

Black
White
Green
Red

1 (REC+)
2(REC—-)
3(XMIT-)
4 (XMIT+)

NOTE
Terminal RCYV is connected to DZ11 XMIT. Terminal XMIT is connected to DZ11 RCYV. Polarity
should always be + to + and — to — for both XMIT
and RCV,

In addition, post 1 is located at the top of the terminal block on the distribution panel and goes in sequence to post 4 at the bottom of the terminal block.

CHAPTER 3
'PROGRAMMING

3.1 INTRODUCTION
‘This chapter provides basic information for programming the DZ11. A description of each DZ11
register, its format, programming constraints, and bit functions are presented to aid programming and
maintenance efforts. Special programming features are also presented in this chapter.
3.1.1. Device and Vector Address Assignments
W
|
The DZ11’s device and vector addresses are selected from the floating vector and device address space.

NOTE
The device floating address space is 160010, to
163776,.
The vector floating address space is 300, to
776s.

Its floating address space follows the DJ11, DH11, DQI L, DU11, DUPI11, LK11, and DMC11.
Its floating vector space follows the DC11; KL11/DL11-A, -B; DP11, DM11-A; DN11; DM11-BB
and other modem control vectors; DR11-A; DR11-C; PA611 reader, PA611 punch; DT11; DXI1;

DL11-C, -D, -E; DJ11; DH11; GT40; LPS11; DQ11; KW11-W; DUI11; DUPI1; DV11; LK11-A;
DWUN; and DMCI1. If a DZ11 is installed in a system with any of the above listed options, then its

assigned vector and device address should follow the vector and device address of the other options.
Two examples follow. Fimt, the simplest case where there is only one DZ11.

Option

Address

GAP
GAP
GAP
GAP
GAP
GAP
GAP
DZ11
GAP

160010
160020
160030
160040
160050
160060
160070
160100
160110

Vector

300

Comment
No DJl1l1s
NoDHlls
NoDQll1s
No DUlls
No DUPI11s
No LKl1l1s
No DMCl1s
No more DZ11s

3-1

Next, a System with one DJ11, one DH11, one GT40, one KW11-W, and two DZ11s.
Option
DJ11
GAP
GAP

DHI11

Address

Vector

160010
160020
160030

300

160040

310

160050

GAP

160060

GT40
KWI11-W
|
|
GAP
GAP
GAP
GAP
GAP
DZ11

160070
160100
160110
160120
160130
160140

GAP

160160

DZ11

3.2

Comment
|

No more DJ11s

DH11 must start on an address boundary that is a multiple of 20.

No more DH11s

320

GT40 address is not in the floating address space.

330

160150

|
340
350

KW11-W address is not in the floating
address space.
NoDQlls
NoDUlls
No DUPl1s
No LKl1ls
No DMClls
|

No more DZ11s

A comprehensive pictorial of all register bit assignments is shown in Figure 3-1. The four device
registers (DRO, DR2, DR4, and DR6) are subdivided to form six unique registers. This subdivision is
accomplished in DR2 and DR6 by assigning read-only (RO) or write-only (WO) status to each register. Since the reading and writing of DR2 and DR6 accesses two registers, PDP-11 processor instructions that perform a read-modify-write (DATIP) bus cycle cannot be used with DR2 or DR6. Also,
DR2 permits only word instructions, but either byte or word instructions may be used with DR6. DRO
and DR4 have no programming constraints. In all register operations, the following applies: read-only
bits are not affected by an attempt to write, and write-only and *“‘not-used” bits appear as a binary 0 if
a read operation is performed. Specific programming constraints for each register are discussed in the
following paragraphs. A description of each bit function is presented in Tables 3-1 through 3-3.
3.2.1

Control and Status Register (CSR)

The control and status register (CSR) contains the states of flags and enable bits for scanning, processor interrupts, clearing, and maintenance. The 16-bit CSR has no programming constraints. The format is depicted in Figure 3-1, and bit functions are described in Table 3-1. Write-only and *“not-used”
bits are read as zeros by the Unibus, and read-only bits are not affected by write attempts.

«*'V'MMMW"\‘!‘J,,

BYTES
MSB

HIGH g LOW

JRO

(CSR)

RECEIVER

_|RO_|RO _JRORO RO(RO __| RO

BUFFER

LINE | LINE | LINE

| RO_IRO |RO__

JRBUF | RBUF | RBUF | RBUF

RBUF

RBUF | RBUF|

RBUF

LINE

ODD | PAR

PARAMETER

FREQ | FREQ | FREQ

(LPR)

| STOP | CHAR

CHAR

| ENAB | CODE | LGTH

LGTH

LINE | LINE | LINE

LINE | LINE | LINE
ENAB | ENAB | ENAB

JPAR

TRANSMIT *
CONTROL
(TCR)

DTR
7

| DTR |
6

DTR
5

'DTR
4

DTR
3

| DTR | DTR | DTR
2
1
0

,
RO

mooem*
<
DR6

(RBUF)

DR4

LSB

CONTROL T
T Mé“m I
....,...-......._...,...._._.__...____,________é_ ‘o“ m; }
&STATUS | TRDY
| TIE | SA
SAE | T/&
|TUNE|
TLINE
|TUNE feponel RiE | mse | ctr | wat | /&S | /9|
/&
|
N]
C
B

DRO

DR2
<

[~
I~
T~ ~T1T

-T
T

| RI6

| RIS

RI 3

RI 2

Ri1 | RIO

Wo |wo

TBUF

TBUF | TBUF | TBUF

STATUS

|co

RI7

(MSR)

" WO

TRANSMIT
DATA

(TDR)

RI 4

BRK

|BRK

;

|BRK

BRK

|BRK

Jwo

B
JTBUF | TBUF | TBUF | TBUF

*The high byte of the TCR (Data Terminal Ready) and the MSR are not used with the 20 mA options.
'

11-6313

Figure 3-1

Table 3-1
Bit

Title

00-02

Not used

- Maintenance (MAINT)

CSR Bit Functions
Function

A read/write bit that, when set, causes the serial
output data from the transmitter to be fed back as
serial input data to the receiver. All lines are turned
around. Cleared by BUS INIT and CLR.

Clear (CLR)

A read/write bit that fires a one-shot to generate a
15 us reset which clears the receiver silo, all
UARTs, and the CSR. After a CLR is issued, the
CSR and line parameters must be set again. CLR
in progress is indicated by CLR = 1. Modem control registers are not affected, nor are bits 00
through 14 of RBUF.

Master Scan Enable

A read/write bit that activates the scanner to enable the receiver transmitter and silo. Cleared by
CLR and BUS INIT.

Receiver Interrupt Enable

A read /write bit that enables the receiver interrupt.
Cleared by CLR and BUS INIT.

Receiver Done (RDONE)

A read-only bit (hardware set) that generates RCV
INT if bit 06 = 1 and bit 12 = 0. The bit clears
when the RBUF is read and resets when another
word reaches the output of the silo (RBUF). If bit
06 = 0, RDONE can be used as a flag to indicate
that the silo contains a character. If bit 12 = 1,
RDONE does not cause interrupts but otherwise
acts the same.

08-10

Transmit Line A-C (TLINE)

When bit 15 = 1, these three read-only bits indicate
the line that is ready to transmit a character. Bit 15
clears when the character is loaded into the transmit buffer, but sets again if another line is ready. A
new line number could appear within a minimum
of 1.9 us. Bits 08-10 return to line 0 after a CLR or
BUS INIT. These bits are meaningful only when
bit 15 (TRDY) is true.

Not used

Silo Alarm Enable (SAE)

A read/write bit that enables the silo alarm and
prevents RDONE from causing interrupts. If bit 06
= 1, the SAE allows the SA (bit 13) to cause an
interrupt after 16 entries in the silo. If bit 06 = 0,
the SA can be used as a flag. The bit is cleared by
CLR and BUS INIT.
=i

3-5

Table 3-1

CSR Bit Functions (Cont)

Bit

Title

Function

Silo Alarm (SA)

A read-only bit set by the hardware after 16 characters enter the silo. It causes an interrupt if bit 06

= | and is cleared by CLR, BUS INIT, and reading the RBUF. When the silo flag occurs (SA = 1),
the silo must be emptied because the flag will not
be set again until 16 additional characters enter the
silo.

Transmitter Interrupt Enable

A read/write bit that allows an interrupt if bit 15

Transmitter Ready (TRDY)

A read-only bit that is set by hardware when a line

(TIE)

(TRDY) = 1.

number is found that has its transmit buffer empty
and its LINE ENAB bit set. It is cleared by CLR,
BUS INIT, and by loading the TBUF register.

3.2.2 Receiver Buffer (RBUF)
The receiver buffer (RBUF) register contains the received character bits, with line identification, error
status, and data validity flag. As one of two registers in DR2 (RBUF and LPR), RBUF is accessed
when a read operation is performed (write operation accesses the LPR). The programming constraints
for the RBUF register are as follows.
1

Byte instructions cannot be used.

It is a read-only register.

TST or BIT instructions cannot be used because they cause the loss of a character.

The register requires master scan enable (CSR, bit 05) to be set in order to be functional.
When this bit is off, bits 00 to 14 of the RBUF become invalid regardless of the state of bit
15 (data valid) and the silo is held empty. The register format of RBUF is depicted in Figure
3-1 and bit functions are described in Table 3-2. Each reading of the RBUF register advances the silo and presents the next character to the program. Bits 00 through 14 do not go
to zero after a CLR or BUS INIT; however, they become invalid and the silo is emptied. Bit
15 (data valid) does clear to zero. (See Table 3-2.)

3-6

Table 3-2

RBUF Bit Functions

Bit

Title

Function

00-07

Received Character

These bits contain the received character. If the selected code level is less than eight bits wide, the
high-order bits are forced to zero.

08-10

Line Number

These bits present the line number on which the
character was received.

Not used

Parity Error

This bit indicates whether the received bit had a
parity error. The parity bit is generated by hardware and does not appear in the RBUF word.

Framing Error

This bit indicates improper framing (stop bit not a
mark) of the received character and can be used for
break detection.

Overrun

This bit indicates receiver buffer overflow. The resultis a received character whichis replaced by another received character before storage in the silo.
A characteris lost but the received character put in
the silo is valid.

Data Valid

This bit indicates that the character read from the
silo (RBUF) is valid. The RBUF is read until the
data valid bit = 0, indicating an invalid character
and empty silo. Cleared by CLR and BUS INIT.

3.2.3 Line Parameter Register (LPR)
The line parameter register (LPR) is a 16-bit register that sets the parameters (character and stop code
lengths, parity, speed, and receiver clock) for each line (Table 3-3). Bits 00-02 select the line for
parameter loading. Line parameters for each line must be reloaded after a CLR (bit 04 of CSR) or
BUS INIT operation. The programming constramts for the LPR are as follows.
>

Itis a write-only register.

BIS or BIC instructions are not allowed.

Byte operations cannot be used.

3-7

Table 3-3

LPR Bit Functions

s
fiy,

Bit

Title

Function

00-02

Line Number

These bits select the line for parameter loading

| 03-04

Character Length

These bits set the character length for the selected

Stop Code

Parity

line. The parity bit is not part of the character
length.
04

0
0
1
1

0
1
0
1

5 bits
6 bits
7 bits
8 bits

This bit sets the stop code length (0 = 1-unit stop, 1
= 2-unit stop or 1.5-unit stop if a 5-level code is
employed).
This bit selects the parity option (0 = no parity
check, 1 = parity enabled on TRAN and RCV).

Odd Parity

This bit selects the kind of parity (0 = even parity

select, 1 = odd parity select). Bit 06 must be set for
this bit to have effect.
08-11

Speed Select

These bits select the TRAN and RCV speed for the

line selected by bits 00-02. Refer to Table 3-4 for a
list of available baud rates.
12

Receiver On

This bit must be set when loading parameters to

activate the receiver clock. (Transmitter clock is always on.)

A CLR or BUS INIT turns the receiver

clock off.

3.2.4 Transmit Control Register (TCR)
The transmit control register contains 16 bits for the EIA options (M7819 module) and 8 bits for the 20
mA option (7814 module). The difference is that the data terminal ready (DTR) lines that make up the
high byte (bits 08 through 15) of the TCR are not used by the 20 mA options because they do not have
modem control capabilities.
”’

The high byte (M7819 only) contains a read/write DTR bit for each line. This byte is cleared by BUS
INIT only, not by CLR. When the high byte is not used (M 7814 only), it reads back to the Unibus as
all zeros. Attempts to write into it will have no effect. The low byte contains a read/write line enable
bit for each line. A set bit allows transmission on the corresponding line. Paragraph 3.3.7 explains how
to properly use this bit. This byte is cleared by CLR and BUS INIT.

3-8

3.2.5 Modem Status Register (MSR)
,
This is a 16-bit register used only with the EIA options (M7819 module). The 20 mA options (M7814
module) do not have modem control capabilities. When not used, this register reads all zeros to the
Unibus.

The MSR consists of two bytes: the low byte (bits 00-07) and the high byte (bits 08-15). The low byte
monitors the state of each line’s ring indicator (RI) lead; the high byte monitors the state of each line’s
carrier (CO) lead. The MSR is the read-only portion of DR6 and has the following programming
characteristics.
1.

It is a read-only register.

CLR and BUS INIT have no effect.

Bit format is shown in Figure 3-1.

3.2.6 Transmit Data Register (TDR)
The TDR consists of two 8-bit bytes. The low byte is the transmit buffer (TBUF) and holds the
character that is to be transmitted. The high byte is the break register with each line controlled by an
individual bit. When a break bit is set, the line associated with that bit starts sending zeros immediately
and continuously. The TDR is the write-only portion of DR6 and has the following programming
characteristics.
|

It is a write-only register.

BIS or BIC instructions cannot be used.

For character lengths less than 8 bits, the character loaded into the TBUF must be right
justified because the hardware forces the most significant bits to zero.

The break register has no effect when running in the maintenance mode (i.e., CSR bit 03 =
1).

It is cleared by CLR and BUS INIT.

Bit format is shown in Figure 3-1.

3.3 PROGRAMMING FEATURES
The DZ11 has several programming features that allow control of baud rate, character length, stop
bits, parity, and interrupts. This section discusses the application of these controls to achieve the
desired operating parameters.
3.3.1 Baud Rate
The selection of the desired transmission and reception speed is controlled by the conditions of bits 08
through 11 of the LPR. Table 3-4 depicts the required bit configuration for each operating speed. The
baud rate for each line is the same for both the transmitter and receiver. The receiver clock is turned on
and off by setting and clearing bit 12 in the LPR for the selected line.

3-9

Table 3-4

Bits
11

0
0
0
0
0
0
0
0
1
1
1
1
1
1

0
0
0
0
1
1
1
1
0
0
0
0
1
1

0
0
1
1
0
0
1
1
0
0
1
1
0
0

0
1
0
1
0
1
0
1
0
1
0
1
0
1

1
1

3.3.2

Character Length

3.3.3

Stop Bits

3.3.4

Parity

Baud Rate Selection Chart

1
1

|
1

0
1

Baud Rate

50
75
110
134.5
150
300
600
1200
1800
2000
2400
3600
4800
7200

9600
|
Not used

The selection of one of the four available character lengths is controlled by bits 03 and 04 of the LPR.
The bit conditions for bits 04 and 03, respectively, are as follows: 00 (5-level), 01 (6-level), 10 (7-level),
and 11 (8-level). For character lengths of 5, 6, and 7, the high-order bits are forced to zero.

The length of the stop bits in a serial character string is determined by bit 05 of the LPR. If bit 05 is a
zero, the stop length is one unit; bit 05 set to a one selects a 2-unit stop unless the 5-level character
length (bits 03 and 04 at zero) is selected, in which case the stop bit length is 1.5 units.

The parity option is selected by bit 06 of the LPR. Parity is enabled on transmission and reception by

setting bit 06 to a one. Bit 07 of the LPR allows selection of even or odd parity, and bit 06 must be set
for bit 07 to be significant. The parity bit is generated and checked by hardware, and does not appear
in the RBUF or TBUF. The parity error (bit 12, RBUF) flag is set when the received character has a
parity error.
3.3.5

Interrupts

The receiver interrupt enable (RIE) and silo alarm enable (SAE) bits in the CSR control the circumstances upon which the DZI11 receiver interrupts the PDP-11 processor.

If RIE and SAE are both clear, the DZ11 never interrupts the PDP-11 processor. In this case, the
program must periodically check for the availability of data in the silo and empty the silo when data 1s
present. If the program operates off a clock, it should check for characters in the silo at least as often as
the time it takes for the silo to fill, allowing a safety factor to cover processor response delays and time
to empty the silo. The RDONE bit in the CSR will set when a character is available in the silo. The
program can periodically check this bit with a TSTB or BIT instruction. When RDONE is set, the
program should empty the silo.

3-10

If RIE is set and SAE is clear, the DZ11 will interrupt the PDP-11 processor to the DZ11 receiver
vector address when RDONE is set, indicating the presence of a character at the bottom of the
silo.
The interrupt service routine can obtain the character by performing a MOV instruction from
the
RBUF. If the program then dismisses the interrupt, the DZ11 will interrupt when another character
is
available (which may be immediately if additional characters were placed in the silo while the interrupt
was being serviced). Alternatively, the interrupt service routine may respond to the interrupt by emptying the silo before dismissing the interrupt.
|

If RIE and SAE are both set, the DZ11 will interrupt the PDP-11 processor to the DZ11 receiver
vector when the silo alarm (SA) bit in the CSR is set. The SA bit will be set when 16 characters
have
been placed in the silo since the last time the program has accessed the RBUF. Accessing the RBUF
will clear the SA bit and the associated counter. The program should follow the procedure described
in
Paragraph 3.3.6 to empty the silo completely in response to a silo alarm interrupt. This will ensure
that
any characters placed in the silo while it is being emptied are processed by the program.

NOTE
|
If the program processes only 16 entries in response
to each silo alarm interrupt, characters coming in
while interrupts are being processed will build up
without being counted by the silo alarm circuit and
the silo may eventually overflow without the alarm
being issued.

If the silo alarm interrupt is used, the program will not be interrupted if fewer than 16 characters are
received. In order to respond to short messages during periods of moderate activity, the PDP-11
program should periodically empty the silo. The scanning period will depend on the required
responsiveness to received characters. While the program is emptying the silo, it should ensure that DZ]1
receiver interrupts are inhibited. This should be done by raising the PDP-11 processor priority.
The
silo alarm interrupt feature can significantly reduce the PDP-11 processor overhead required
by the
DZ11 receiver by eliminating the need to enter and exit an interrupt service routine each time a character is received.
The transmitter interrupt enable bit (TIE) controls transmitter interrupts to the PDP-11 processor.
If
enabled, the DZ11 will interrupt the PDP-11 processor to the DZ11 transmitter interrupt vector
when
the transmitter ready (TRDY) bit in the CSR is set, indicating that the DZ11 is ready to accept
a
character to be transmitted.
|
3.3.6 Emptying the Silo
fl
|
|
The program can empty the silo by repeatedly performing MOV instructions from the RBUF
temporary storage. Each

MOVinstruction will copy the bottom character in the silo so it will not be

lost and will clear out the bottom of the silo, allowing the next character to move down for access by
a
subsequent MOV instruction. The program can determine when it has emptied the silo by testing
the
data valid bit in each word moved out of the RBUF. A zero value indicates that the silo has been
emptied. The test can be performed conveniently by branching on the condition code following
each
MOY instruction. A TST or BIT instruction must not access the RBUF because these instructions
will
cause the next entry in the silo to move down without saving the current bottom character. Furthermore, following a MOV from the RBUF, the next character in the silo will not be available for at
least
1 us. Therefore, on fast CPUs, the program must use sufficient instructions or NOPs to ensure
that
successive MOVs from the RBUF are separated by a minimum of 1 us. This will prevent
a false
indication of an empty silo.

3-11

a Character

Transmitting
the control and
The program controls the DZ11 transmitter through five registers on the Unibus:
status register (CSR), the line parameter register (LPR), the line enable register, the transmitter buffer

3.3.7

(TBUF), and the break register (BRK).

speed and character
Following DZ11 initialization, the program must use the LPR to specify the bit
in the CSR. The
(MSE)
format for each line to be used and must set the master scan enable
the DZ11 transwants
it
if
CSR
program should set the transmitter interrupt enable (TIE) bit in the
mitter to operate on a program interrupt basis.

line. One bit in this 8-bit
The line enable register is used to enable and disable transmission on eachusing
MOV, MOVB, BIS,
by
bits
clear
and
set
register is associated with each line. The program can
and the DTR
register
enable
line
the
used,
are
ons
BISB, BIC, and BICB instructions. (If word instructi
registers on M7819 modules are simultaneously accessed.)

line (line
The DZ11 transmitter is controlled by a scanner which is constantly looking for an enabled
a line, it
such
finds
scanner
the
When
buffer.
er
enable bit set) which has an empty UART transmitt
sets the
and
CSR
the
of
field
(TLINE)
number
line
loads the number of the line into the 3-bit transmit
TRDY
the
clear
can
program
The
set.
is
bit
TIE
the
if
" TRDY bit, interrupting the PDP-11 processor
bit.
enable
line
the
clearing
by
or
TBUF
the
into
line
indicated
" bit by moving a character for the
Clearing the TRDY bit frees the scanner to resume its search for lines needing service.

wait for
To initiate transmission on an idle line, the program should set the TCR bit for that line and
number of the line
the scanner to request service on the line, as indicated by the scanner loading thetransmitt
into the
into TLINE and setting TRDY. The program should then load the character to be of startingedup
TBUF by using a MOVB instruction. If interrupts are to be used, a convenient way routine loada line
the
is to set the TCR bit in the main program and let the normal transmitter interrupt
character into the TBUF.

NOTE

The scanner may find a different line needing service
before it finds the line being started up. This will occur if other lines request service before the scanner

can find the line being started. The program must

always check the TLINE field of the CSR when responding to TRDY to ensure it loads characters for
the correct line. Assuming the program services lines
as requested by the scanner, the scanner will eventually find the line being started. If several lines require
service, the scanner will request service in priority
order as determined by line number. Line 7 has the
highest priority and line 0 the lowest.

ed into
To continue transmission on a line, the program should load the next character to be transmitt
TRDY.
and
TLINE
the TBUF each time the scanner requests service for the line as indicated by
waits for the
To terminate transmission on a line, the program loads the last character normally and
bit at this
enable
line
the
clears
program
scanner to request an additional character for the line. The
time instead of loading the TBUF.

3-12

The normal rest condition of the transmitted data lead for any line is the 1 state. The break register
(BRK)is used to apply acontinuous zero signal to the line. One bitin this 8-bit register is associated
with each line. The line will remain in this condition as long as the bit remains set. The program should
use a MOVB instruction to access the BRK reglster If the program continues to load characters for a
line after setting the break bit, transmitter operation will appear normal to the program despite the fact
that no characters can be transmltted while the lineis in the continuous zero sending state. The program may use this facility for sending precisely timed zero signals by setting the break bit and using
transmit ready interrupts as a timer.

It should be remembered that each line in the DZ11 is double buffered. The program must not set the
BRK bit too soon or the two data characters preceding the break may not be transmitted. The program must also ensure that the line returns to the 1 state at the end of the zero sending period before
transmitting any additional data characters. The following procedure will accomplish this. When the
scanner requests service the first time after the program has loaded the last data character, the program
should load an all-zero character. When the scanner requests service the second time, the program
should set the BRK bit for the line. At the end of the zero sending period, the program should load an
all-zero character to be transmitted. When the scanner requests service, indicating this character has
begun transmission, the program should clear the BRK bit and load the next data character.
3.3.8

Data Set Control

DZ11 models with EIA interfaces include data set control as a standard feature. The program may
sense the state of the carrier and ring indicator signals from each data set and may control the state of
the data terminal ready signal to each data set. The program uses three 8-bit registers to access the
DZ11 data set control logic. One bit in each register is associated with each of the eight lines. There are
no hardware interlocks between the data set control logic and the receiver and transmitter logic. Any
required coordination should be done under program control.
The data terminal ready (DTR) register is a read /write register. Setting or clearing a bit in this register
will turn the appropriate DTR signal on or off. The program may access this register with word or byte
instructions. (If word instructions are used, the DTR and line enable registers will be simultaneously
accessed.) The DTR register is cleared by the INIT signal on the Unibus butis not cleared if the
program clears the DZ11 by setting the CLR bit of the CSR.
The carrier register (CAR) and ring register (RING) are read-only registers. The program can determine the current state of the carrier signal for a line by examining the appropriate bit of the CAR
register. It can determine the current state of the ring signal by examining the appropriate bit of the
ring register. The program can examine these registers separately by using MOVB or BITB instructions or can examine them as a single 16-bit register by using MOV or BIT instructions. The DZ1
1
data set control logic does not interrupt the PDP-11 processor when a carrier or ring signal changes
state. The program should periodically sample these registers to determine the current status. Sampling at a high rate is not necessary.

3.4 PROGRAMMING EXAMPLES
The following six examples are sample programs for the Dle option. These examples are presented
only to indicate how the DZ11 can be used.

3-13

Example 1 - Initializing the DZ11

The DZ11 is initialized by a power-up sequence, a reset instruction, or a device clear instruction.

Device Clearing the DZ11
001000
001002
001004
001006
001010
001012
001014

012737
000020
160100
032737
000020
160100
001374

START:

MOV #0, DZCSR

1$:

BIT #20, DZCSR

Set bit4 in the

;DZ11 control and
;status register.
;Test bit 4.

'BNE 1$

;If bit 4 1s still
;set, the branch
;condition is true
;and the device clear
;function is still in
;progress.

001016

:The device clear
;function is complete
;and the DZ11 has been
;cleared.

HALT

DZCSR = Control and Status Register Address = 160100.
Example 2 - Transmit Binary Count Pattern on One Line
001000
001002

012737
000020

001004

160100

001006
001010
001012
001014

001016

032737
000020
160100

001374

012737

001020
001022

001070
160102

001024

012737

START:

MOV #0, DZCSR

Set bit 4 in the DZ11

15:

‘BIT #20, DZCSR

:Testbit4.

BNEI1$

;If bit 4 is still set,
~;the branch condition

:control and status
;register.

:1s true and the device
:clear function is still
;in progress.
- ;Load the parameters
:for line 0: 8-bit

~ MOV #n, DZLPR

~;character; 2 stop bits;
MOV #1, DZTCR

3-14

:110 baud
;Enable line 0
;transmitter.

001026
001030
001032
-

000001
160104
012737

001034
001036
001040

000040
160100

001042
001044
001046

005737
160100
100375

|
MOYV #m, DZCSR

005000

CLR RO

2$:

TST DZCSR
BPL 2§

001050
001052
001054
001056

110037
160106
105200
100371

INCB RO
BPL 2%

001060

000000

HALT

MOVB RO, DZTDR

;Set scanner enable bit

;5 in the control and
;status register.
;Set binary count
;pattern to zero.

;Test the transmitter
;ready flag (bit 15).
;If branch condition

;1s false, continue;
;otherwise test again.
:Load character to be

;transmitted.
;Increment binary count.
;If branch condition is
;false, the binary count
;pattern is complete.

RO = Register 0 = Binary Count Pattern
DZCSR = DZI11 Control and Status Register Address = 160100
DZLPR = DZ11 Line Parameter Register Address = 160102
DZTCR = DZI11 Transmit Control Register Address = 160104
DZTDR = DZ11 Transmit Data Register Address = 160106

Example 3 — Transmit a Binary Count in Maintenance Loopback Mode, with the Receiver “On”’ in the
Interrupt Mode

Output Received Data to Console
001200

005000

CLR RO

;Set binary count

001202

012701

MOV 1400, R1

;Set R1 to first

001204

001400

001206
001210
001212
001214
001216

012706
001100
012737
001304
000300

MOV #SP, R6

001220
001222

005037
000302

CLR (RVEC+2)

001224
001226

012737
000020

MOV #20, DZCSR

MOYV #INT, RVEC

;to zero.

;address of data
:buffer.
;Initialize stack
;pointer.
;Set DZ11 vector
;address to start of
;receiver interrupt
;routine.
;Set up processor
;status word for DZ11
;receiver interrupt.
;Set bit 4 in the
;DZ11 control and
;status register.

315

001230
001232
001234
001236
001240

160100
032737
000020
160100
001374

1%:

BIT #20 DZCSR

;Test bit 4.

BNE 1%

;If bit 4 is still
:set, the branch
;condition is true
;and the device clear
is still in
:function
;progress.

001242
001244
001246

012737
011070
160102

MOV #PAR, DZLPR

001250

012737

MOV #1, DZTCR

001252
001254
001256
001260
001262

000001
160104
012737
000150
160100

MOV #150, DZCSR

001264
001266
001270

005737
160100
100375

001272
001274
001276
001300

110037
160106
105200
001371

INCB RO
BNE 2%

001302

000777

BR.

28:

TST DZCSR

BPL 2%

MOVB RO, DZTBUF

3-16

;Load the parameters
-for line 0: 8-bit
:character; 2 stop bits;
:110 baud; no
;parity; receiver on.
:Enable line 0
stransmitter.

‘Turn scanner on,
:enable receiver
;interrupts, and loop
:lines back on themselves.
‘Test the transmitter
;ready flag.
:If branch condition is
-false, continue;
;otherwise test again.
:Load character to be
;transmitted.
:Increment binary count.
:If branch condition is
;false, the binary count
;pattern is complete.
:Wait for last character
-transmitted to be
:received.

Receiver Interrupt Service Routine

;Store received
;character in memory

001304
001306

013711
160102

MOV DZRBUF, (R1)

001310
001312
001314

022721
100377
001401

CMP #100377,
(RD+
BEQ .+2

001316
001320
001322

000002
012701
001400

RTI
MOV #1400, R1

001324
001326
001330

105737
177564
100375

001332
001334
001336
001340
001342

111137
177566
022721
100377
001370

CMP #100377,
(RD+
BNE 3%

stransfer character
:to console.
:Check for last
:character.
:Not finished if

001344

000000

HALT

:finished.

33:

TSTB TPS

BPL 3%
MOVB (R1), TPB

RVEC = DZ11 Receiver Interrupt Vector Address
DZCSR = DZ11 Control and Status Word Address
DZLPR = DZI11 Line Parameter Register (Write-Only) Address
DZTCR = DZ11 Transmit Control Register Address
DZTBUF = DZ11 Transmit Buffer Address

DZRBUF = DZ11 Receiver Buffer Address (Read-Only Register)
TPS = Teletype® Punch Status Register Address
TPB = Teletype Punch Data Register Address

®Teletype is a registered trademark of Teletype Corporation.
3-17

:table.

;:Check for last
;character.
:Branch condition is

:true when last
:transmitted character
;1s received.

:Exit routine.
;Initialize pointer
;to start of received

;:data buffer in memory.

:Test to see if console
;is ready.
:Wait, and test again.
-If condition is met,

:condition is true.

Example 4 - Transmit and receive in Maintenance Mode on a Single Line
The switch register bits (SWR00-SWRO07) hold the desired data pattern (character).

001000
001002

012737
000002

001004
001006
001010

160104
012737
017471

001012

160102

START:

MOV #LINE, DZTCR

:Select the line for
;transmitting on.

MOV #PAR, DZLPR

;Choose one of eight.
;Line #1 selected.
;Select desired line
;parameters for
;transmitting line

:and turn on receiver
.for that line.
;8-level code, 2 stop
;bits, and no parity
;selected.
:19.2K baud selected
:Note: 19.2K baud is
;not used by the
;customer but can be
;used for diagnostic
;purposes to speed up

;the transmit-receive
;loop to make it easier

001014
001016
001020
001022
001024
001026

012737
000050
160100
005737
160100
100375

001030
001032
001034
001036

113737
177570
160106
000240

001040

012701
177670

;to scope.

MOV #N, DZCSR

Test 1:

TST DZCSR
BPL Test2

MOVB SWR,
DZTBUFF
NOP

MOV #DEL, R1

3-18

;Start scanner and set
;maintenance bit 3.
:Test for bit 15
;(transmitter ready).
:If the branch condition
;is false, the transmitter
;1s ready; if true, go
;back and test again.
;Load the transmit
~:character from the
;switch register.
;INo operation. This
;location can be changed
:to a branch instruction
;if only test 1 is
;desired (replace 000240
;with 000771).
;Delay equals a
:constant that will
;allow enough time for
;the receiver done
;flag to set before
;recycling the test.
;The value will change
:with baud rate and
;processor. The
;constant given is
;good for 19.2K baud
;ona PDP-11/05.

001042
001044
001046

105737
160100
100402

001050
001052

001373

001054
001056

013700
160102

001060

000760

Test 2:

TSTB DZCSR
BMI 1%

005201

INCRI1
BNE TEST 2

1%:

MOV DZRBUF, R0

BR TEST 1

;Test bit 2 (receiver
;done flag).
;When the branch
;condition is true,
;the receiver done
;flag is set.
;Increment delay.
;If the branch
;condition is true, the
;delay is not finished.
;Read the DZ11
;receiver buffer to
;register 0.
;Loop back and
;test again.

Example S - Transmit and Receive on a Single Line Using Silo Alarm in Maintenance Mode
001200
001202
001204
001206
001210
001212
001214

012706
001100
012737
001274
000304
005037
000306

001216
001220

012700
001304

MOV #DBUF, RO

001222

012737

MOV #1, DZTCR

001224
001226
001230
001232
001234
001236
001240
001242

000001
160104
012737
017470
160102
012737
050050
160100

001244
001246
001250
001252

032737
020000
160100
001774

1$:

001254
001256
001260
001262

013720
160102
000240
000240

28:

MOV #1100, R6
MOV #3838, TVEC

CLR TVEC+2

;Initialize stack
;pointer.
;Initialize transmitter
;vector address.
;Initialize transmitter
;vector processor status

MOV #17470,
DZLPR

MOV #50050,

DZCSR

BIT #20000,
DZCSR
BEQ 1%

MOV DZRBUF,
(RO)+
NOP
NOP

;word.
;Set first address of
;input data table
;into RO.
;Enable line 0
;transmitter.

;Set up line parameters
;and turn on the receiver
:clock for line 0.
;Enable transmitter
;interrupt and silo
;alarm. Turn on
;scanner and maintenance
;mode.
;Test for silo alarm

;Loop until silo alarm
;flag sets.
;Read DZ11 silo
;receiver buffer output.
;Delay to allow next
;word 1n silo to filter
;down to the silo
;output.

3-19

001264

100773

001266
001270

012700
001304

001272

000764

BMI 2%

:Data valid set says

MOV #DBUF, RO

-Silo has been emptied.

-that word is good,
:go back for more.

:Reinitialize data
-table address pointer.

Do it again.

BR 1%

Transmitter Interrupt Service Routine
001274
001276
001300
001302

112737
000252
160106
000002

MOVB DAT, DZTBUF

‘Transmit

:character 252

RTI

Data Table

1304
1306

100252
100252

;Word 1
:

1340
1342

100252
000252

;Word 16
;Data valid
:not set

:.character is

;:invalid
NOTE

It is possible to get more than 16 words because they
are being put into the silo simultaneously with the

3-20

Example 6 - Echo Test on a Single Line (Transmit Received Data)

001000

012737

001002

011073

001004

160102

001006
001010
001012
001014
001016
001020
001022
001024
001026

012737
000010
160104
012737
000040
160100
105737
160100
100375

001030
001032
001034

005737
160100
100375

001036
001040
001042
001044

013700
160102
110037
160106

001046

000765

START

MOV #PAR, DZLPR

MOV #LINE, DZTCR

1$:

MOV #n, DZCSR

;Turn scanner on
;(set CSR-5)

TSTB DZCSR

;Test (bit 7) for

BPL 1%

2%:

;Load line parameters
;for line being used.
:Line 3, 8-bit
;character, 2 stop
;bits, no parity,
:110 baud, and receiver
:clock on.
;Turn line 3
;transmitter on.

TST DZCSR
BPL 2%

MOV RBUF, RO
MOVB RO, DZTDR

BR 1§

3-21

;RDONE
;If bit 7 is not set,
;g0 back and test again.
;Test (bit 15) for
‘TRDY
If bit 15 is not set
;20 back and test again.
:Read received data
;word into RO
;Load character
;into DZ11 TBUF
;register for
;transmitting.
;Repeat.

g
o

APPENDIX A

DZ11 (M7814) TO AN ACTIVE DEVICE INSTALLATION

receivers must be used.
er active device, two H319 current loop
When a 20 mA DZ11 is used with anoth
DZ11 is used with another
the connections involved when the
Figure A-1 provides an exampleer ofDZ11.
A schematic of the H319 is shown in Figure A-2.
active device, in this case anoth

uBn

uAn

DZ11

H317F DISTRIBUTION PANEL

‘

H317F DISTRIBUTION PANEL

GREEN
1

@ | REC - DZ11 8"

(©:

- @
DZ11 "A” REC

pz11 A" xmiT- |@D
DZ11 “A” XMIT +

H319 INPUT

\ —u

. XMIT + DZ11 “B"

H319

||
10 FT.CABLE
SUPPLIED WITH |

H319 OUTPUT

XMIT - DZ11 “B"

H319

(
/

| BCO4R-XX CABLE

| w3 @ R
o1

11-5639

SHOULD HAVE THE
NOTE: THE CABLE ATTACHED TO THE H319
CONNECTOR REMOVED AND RING LUGS ATTACHED TO THE
RED AND GREEN LEADS AS SHOWN.
THE BLACK AND WHITE LEADS IN THE H319 CABLE AND BCO4R CABLE
ARE NOT USED.

Figure A-1 DZ11 (M7814) to Active Device Connection

BLK

I.‘{«r WHT
h—

AL, GRN

<
<

M‘O-h

S8
x

(.& o 0 QU @9» S SN .-Di'i

TL
~-

?z.‘w -

Q2132
[4

30K

D664
D664
D2
RL
~ - RED
Sl

11-5640

Figure A-2

H319 Current Loop Receiver Schematic Diagram

Reader’s Comments
DZ11 USER’S GUIDE
EK-DZ110-UG-002

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