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EK-ISB11-UG-001

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Document:	EK-ISB11-UB-001 DECdataway Users Guide Mar78
Order Number:	EK-ISB11-UG
Revision:	001
Pages:	37
Original Filename:	EK-ISB11-UB-001_DECdataway_Users_Guide_Mar78.pdf

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DISTRIBUTED
PLANT MANAGEMENT
OECdataway
user's guide

INDUSTRIAL PRODUCTS

EK-ISB11-UG-001

DECdataway
user's guide

digital equipment corporation • maynard, massachusetts

Preliminary, November 1977
Preliminary, December 1977
1st Edition, March 1978

The material in this manual is for informational
purposes. and is subject to change without notice.
Digital Equipment Corporation assumes no responsibility 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:
DEC
DECCOMM
DECsystem-IO
DECSYSTEM-20

DECtape
DEC US
DIGITAL
MASSBUS

VAX

PDP
RSTS
TYPESET-8
TYPESET-II
UNIBUS

CONTENTS
Page
CHAPTER 1

INTRODUCTION

1.1
1.2
1.2.1
1.2.1.1
1.2.1.2
1.2.2
1.3
1.3.1
1.3.2
1.3.3
1.3.4
1.3.5
1.3.6
1.4

SCOPE ................................................................................................................ I~I
GENERAL DESCRIPTION ............................................................................... I-~I
DECdataway Functions ............................................................................... 1-2
Controller Functions ............................................................................ 1-2
Port Functions ..................................................................................... 1-2
DECdataway Performance ........................................................................... 1-3
PHYSICAL DESCRIPTION .............................................................................. 1-3
KM C II-A Microprocessor Specifications .................................................... 1-3
M8202YE DECdataway Line Unit Module Specifications ............................ 1-3
Cable Specifications ..................................................................................... 1-4
Optional Cables ............................................................................................ 1-5
Line Termination ......................................................................................... 1-5
Applicable Documents ................................................................................. 1-5
PROGRAMMING INFORMATION ................................................................ 1-6

CHAPTER 2

SITE PREPARATION AND PLANNING

2.1
2.2
2.2.1
2.2.2
2.3
2.3.1
2.3.2
2.4
2.4.1
2.5
2.6

INTRODUCTION .............................................................................................. 2-1
ACCESSIBILITY AND SPACE REQUIREMENTS .......................................... 2-:l
Access .......................................................................................................... 2-2
Space Requirements ..................................................................................... 2-2
ENVIRONMENTAL CONSIDERATIONS ....................................................... 2-2
Hostile Environment .................................................................................... 2-2
Static Electricity ........................................................................................... 2-2
ELECTRICAL CONSIDERATIONS ................................................................. 2-2
Ground Requirements .................................................................................. 2-2
CABLE ROUTING CONSIDERATIONS ......................................................... 2-3
SAFETY PRECAUTIONS ................................................................................. 2-4

CHAPTER 3

INSTALLATION

3.1
3.2
3.2.1
3.2.2
3.2.3
3.2.4
3.2.4.1
3.2.4.2
3.2.4.3

INTRODUCTION .............................................................................................. 3-1
DECDATAWAY CABLE ................................................................................... 3-1
Introduction ................................................................................................. 3-1
Installation Sequence .................................................................................... 3-2
Cable Lengths Required ............................................................................... 3-2
Cable Mounting ........................................................................................... 3-3
DECdataway Assembly Items Required ............................................... 3-4
Installing Cable Runs and Associated Hardware ................................... 3-5
Cable Connections ............................................................................... 3-6
iii

CONTENTS (Cont)
Page
3.3
3.3.1
3.3.1.1
3.3.1.2
3.3.1.3

ISBII-A I)ECDATAWAY CONTROLLER ..................................................... 3-13
Intro,duction ............................................................................................ ,.. 3-13
ISBII-A Hardware ............................................................................. 3-13
ISBII-A Software ............................................................................ ,.. 3-13
Acceptance Procedures .................................................................... ".. 3-14

CHAPTER 4

USER'S r~AINTENANCE

4.1
4.2
4.2.1
4.2.2
4.3

INTRODUCTION .............................................................................................. 4-1
PREVENTIVE MAINTENANCE ...................................................................... 4-1
Cable Inspection ............................................................. ,............................. 4-1
Diagnostics .................................................................................................. 4-2
TOOLS A.ND TEST EQUIPMENT ...................................... ,............................. 4-2

FIGURES
:Figure No.
1-1
2-1

2-2
3-1
3-2
3-3
3-4
4-1

Title

Page

Typical D ECdataway Configurations ................................................................... 1-1
Accessibility and Space Requirements .................................... "............................. 2-1
Cable ROl1ting ........................................................................ ,............................. 2-3
Installatio,n Flowchart ............................................................ ,............................. 3-2
Total Cable Length .............................................................................................. 3-3
DECdataway Controller Connector ....................................... ,.............................. 3-8
DECdata'way Port Connector ................................................. ,.........................,.... 3-9
Cable Ch(~ck Points for Shorts ................................................ "............................. 4-1

TABLES
Table No.
3-1
3-2
3-3
3-4
3-5
3-6
3-7
3-8
4-1

Title

Page

DECdata'way Assembly Items ............................................................................... 3-4
Cable Measurements Example .............................................................................. 3-5
Parts List for DPMXX-A ............................................................... ;................ ,.... 3-6
DPMXX Installation Kits .................................................................................... 3-7
Controller Connection Parts List .......................................................................... 3-8
Port Conrlection Parts List ............................................................. "................... 3-10
DECdataway Port Address Selection ..............................,................ ,.................... 3-11
ISBI1-A ]-{ardware .........................................................,.................,................... 3-13
Tools and Test Equipment .............................................................................. "' .... 4-3
iv

CHAPTER 1
INTRODUCTION

1.1 SCOPE
This manual contains a general description of the DECdataway subsystem, including detailed information necessary to install and service the DECdataway cable. It also presents an overall view of the
subsystem, its physical description, and specifications.
1.2 GENERAL DESCRIPTION
DECdataway consists of an ISBII-A controller interfaced with a PDP-II computer and to a desired
number of terminals and peripherals (slaves), each containing a port. The port connector has address
jumpers installed so that the controller can select anyone device with which to communicate. A port
can have more than one address as discussed further in Note 2, Paragraph 3.2.4.3.2. The number of
addresses per controller may not exceed 63. The DECdataway cable is linear and free of any branches,
stubs, splitters, or repeaters as described in detail in Chapter 3. Positioning of the controller is optional. Figure I-I is a block diagram of two typical DECdataway configurations (see Figure 3-2 for
total cable length).
CONFIGURATION EXAMPLE 1:

___-"'-",,""- ____

~...,....

CONFIGURATION EXAMPLE 2:

--,
I

.------,1
--"..........,,...

Figure I-I

-- --

Typical DECdataway Configurations

1-1

---'

DECdataway provides the capability to transfer data between a PDP-II and a maximum of 63 slaves
in a block or message-oriented fashion via controller and multidrop cable. Data transfer between the
PDP-II and the controller is accomplished by the Unibus; data transfer between the controlk~r and
slaves is via the multidrop cable.
Unibus: The Unibus program controlled interface appears as eight bytes of read/write registers in the
PDP-II external page. Thes(: registers are used primarily as a one-way port by the: CPU to pass
information to the controller.

Communication of data from the controller to the CPU is done via an area in main mt:mory set aside
by the operating system.
DECdataway (Multidrop) Cable: A shielded, twisted pair cable provides a path for information transfer between the controller and the ports; transfers are executed sequentially.

1.2.1 DECdataway Functions
The controller is always master of the DECdataway and all transactions on the bus consist of two
messages: (I) a command from the controller to the port and (2) a response from the port to the
controller. There is one excep1tion in that the controller has the capability of broadcasting a message to
all ports simultaneously with no response allowed from any port.
Each message is formatted in DSBC (DEC Serial Bus Control) protocol to ensure error-free communication between the controllc:r and ports by assuring accurate recovery from communic:ation errors.

1.2.1.1

Controller Functions

• Controls access to the bus and thereby establishes bus priorities via the "round robin" poning
scheme.
• Recovers from bus error conditions and reports errors to host.
• Monitors bus connections and notifies the host of devices that connect or disconnect to/from
the bus
• Maintains a logically separate nonprocessor request (NPR) in and J~PR out channel for each
device on the bus (64 into host CPU including one unsolicited data (~hannel and 64 out of host
CPU including one bJroadcast channel).
• Formats information transfers into messages with DSBC Protocol, and adds sequencing and
Cyclic Redundancy Checking (CRC) information to each data transfer.
• Receives messages in DSBC protocol and passes data to the host via an NPR.
• Notifies the host of successful completion of message transfers.

1.2.1.2 Port Functions:
• Receives messages in DSBC protocol and checks for port address and error-free message reception. If these conditions are met, acts in response to the received command.
• Transfers responses back through the bus to the host in DSBC protocol.
• Performs DSBC protocol functions for bus initialization (and reinitialization) and error recovery.
1-2

1.2.2 DECdataway Performance
If a communication error is detected during a transaction between the controller and a port, the
controller generates a recovery procedure so that the transaction is successfully completed. A transaction may involve information transfer in one or two directions on the bus (only one transaction in a
broadcast). The controller supports messages with up to 255 bytes (maximum) of information. A single
bus transaction between the controller and a port can result in up to 255 bytes of information being
moved in each direction on the bus in the correct order and without error. It is this ability to move
error-free blocks of information of variable length in a single bus transaction that gives the DECdataway the throughput potential to be an effective multi device bus for both terminals and process control
peripherals.
The performance of the DECdataway is a function of:
• The communication rate
• The number and type of devices on the bus.
• The protocol used on the bus.
DECdataway data efficiency is the percent of data bytes versus total message transactions for (1) data
transferred in one direction only and (2) in both directions for a complete transaction. Single byte
transfers make poor utilization of the bus; transfers of 8 to 16 bytes can achieve 50% utilization.
1.3 PHYSICAL DESCRIPTION
The DECdataway consists of an ISBI1-A controller that includes a KMCII-A microprocessor
(M8204) module, a line unit (M820YE) module, and associated interface cables. Both modules must be
mounted in a DD ll-C, DDII-D, or equivalent Small Peripheral Controller (SPC) system unit.
.
CAUTION
A DDII-B system unit must not be used.
1.3.1 KMCII-A Microprocessor Specifications
The KMC ll-A consists of a single hex height multilayer module (M8204).
• Cycle time - 300 ns
• Power requirements - 5.0 A @ +5 V
• Environment must be in accordance with applicable portions of DEC Std. 102 for Class C
environment. However, in most cases, the computer system is restricted to Class A.
1.3.2 M8202YE DECdataway Line Unit Module Specifications
This module must be used with the KMCll-A microprocessor; it is not a stand-alone device.
Power Requirements

+4.75 V to +5.25 V @ 3.0 A (max.)
+14 V to +16 V @ 0.1 A (max.)
-14 V to -16 V @ 0.1 A (max.)

Operating mode

Half Duplex

Data format

Synchronous serial by bit LSB first

Character size

8 bits plus 0 to 2 stuffing bits
1-3

Data rate

55,500 bits/second

Modulation

Biphase (space)

Transmitter timing

Adjustable RC clock

Receiver timing

From received signal.

Line interface

Transformer coupled

Transmitter signal

6 V peak (min.) into terminated 200 g cable

Receiver signal threshold

150 mV peak (min.)

Error-free signal level

250 mV peak (min.)

Common mode isolation

350 Vac peak (min.)
500 Vdc

Receiver bandpass

6 kHz - 130 kHz 3 db points

1.3.3 Cable Specifications
The integral modem is designed to operate with shielded, balanced, or unbalanced 75 to 200 n cables.
Digital Equipment Corporation recommends Belden 9182 cable. The cable consists of a shielded,
twisted pair of 22 AWG conductors. The maximum length for this cable its 45.72 m (15,000 ft). This
distance must include the length contributions required at the host and tenninals for servicing.
Belden 9182 Specifications:
Physical Design
Conductors

22 A WG stranded tinned copper (19X34)

Dielectric material

Cellular polypropylene

Nominal insulation thickness

1.65 mm (0.065 in)

Number of pairs

One

Shield

Duofoil (polyester film laminated on both sides with aluminum
foil)

Drain wire

22 AWG (19X34) tinned copper

Jacket

PVC

Jacket thickness

0.89 mm (0.035 in)

Cable Nominal
Diameter

10.26 mm (0.404 in)

1-4

Electrical Characteristics
Nominal dc resistance of
conductor at 20 0 C (68 0 F)

52.5 O/km (16 0/1000 ft)

Nominal capacitance between conductors of a pair

29.5 pF1m (9 pF1ft).

Nominal velocity (V) of
propagation (% of velocity
of light)

67 @ 56 kHz

Nominal impedance (Zo) of
a pair (ohms)

150 @ 1 MHz; 200 @ 56 kHz

1.3.4 Optional Cables
Other cables than Belden 9182 may be used, provided the following criteria are met. However, if cable
impedance is less than 200 0, then the maximum distance is reduced.
• Characteristic impedance 7 5 ~ Zo ~ 200 0 measured at 56 kHz.
• Cable loss < 15 db measured at 56 kHz with termination at both end points.
• Cable run is homogeneous with shield continuity maintained.
• Step response ~ 5 ,."s 10% - 90% risetime measured differentially at end point and driven from a
differential source into terminated line.
• Conductor size - 22 AWG.
1.3.5 Line Termination
The ends of the cable must be terminated in the characteristic impedance of 2000 measured at 56 kHz.
The ports and controller do not provide termination.

1.3.6 Applicable Documents
Digital Site Preparation Guide (EK-CORP-SP)
DECdataway Technical Manual (EK-ISBII-TM)*
KMCII General Purpose Microprocessor User's Manual (EK-KMCII-0P)
KMCII General Purpose Microprocessor Technical Manual (EK-KMCII-TM)*
DMCII IPL Synchronous Line Unit Maintenance Manual (EK-KMCLU-MM)*
Remote Terminals RT801, 803, 805 User's Guide (EK-RT80X-UG)
DPM Terminals Application Programmer's Manual (AA-C878A-TC)
DECdataway Noise Specification (A-SP-ISBII-0-X)
Diagnostic listings (Refer to Paragraph 4.2.2)

*This document is available as part of DIGITAL's microfiche libraries. Printed copies can be obtained from
Digital Equipment Corporation, Communications Services, Northboro, MA 01532.

1-5

1.4 PROGRAMMING INJFORMATION
NOTE
Thtere is no programming information provided in
this User's Guide. For programming information on
the DECdataway, refer to DPM Terminals Application Programmer's Manual (AA-C878A-TC).

1-6

CHAPTER:2
SITE PREPARATION AND PLANNING

2.1 INTRODUCTION
Since installation of the ISBll-A DECdataway subsystem is to be done in conjunction with a host
PDP-II system, the assumption is made that site preparation and planning guidelines for the host
system have been fulfilled. This chapter contains additional guidelines pertaining to accessibility, space
requirements, and environmental and electrical considerations that will facilitate the DECdataway
cable installation and produce efficient total system operation and performance.
2.2 ACCESSIBILITY AND SPACE REQUIREMENTS (Figure 2-1)
Successful installation of DECdataway requires thorough investigation of the existing site and those
areas in which peripherals/terminals are to be located to ensure that proper access points are provided
between the system and the devices for servicing the connecting cable. Therefore, spacing of junction
boxes along the cable route must be planned accordingly.

'SEE DETAILS IN FIG. 2·2

Figure 2-1

Accessibility and Space Requirements

2-1

2.2.1 Access
Access to the M8204 Microprocessor module and the M8202YE Line Unit module is assured in the
site preparation and planning guidelines applicable to the host.
Junction and pull box locations must be in areas that are easily accessible to ensurc~ ease of cable
maintenance.
2.2.2 Space Requirements
Spacing related to DECdataway with emphasis on cable lengths and junction and pull box locations is
determined by the number of peripherals or terminals associated with a spedfic installation with ]possible expansion considerations.
2.3 ENVIRONMENTAL CONSIDERATIONS
Area environment can have a substantial effect upon the overall reliability of the system. Several
factors must be considered with respect to the areas in which the cable is to be routed.
Temperature: Cable attenuation increases with temperature. Also, routing cables in areas where temperatures exceed vendor specifications of nominal room temperatures and allowable d'~wiations cause
.
cables to age faster than at the normal rates.
Moisture: Moisture-related impurities may enter the cable through cuts or scratche:s on the outer
jacket or through improperly installed connectors. Minute amounts of water vapor will condense into
water and can migrate along the shield. ·Water condensed from a polluted atrnosphere can contaminate
the entire length of the cable" shorten its life, and seriously degrade its performance.

2.3.1 Hostile Environment
DIGIT AL has designed a spe:cial enclosure which solves many of the mechanical, electrical, and environmental problems of housing and protecting standard rack-mounted cornputer equipment in a hostile environment. It is the customer's responsibility to protect the DECdataway cable within such an
environment.
2.3.2 Static Electricity
Static electricity, a result of physical action, can affect the operational characteristics of a computer,
related peripheral equipment, and cabling. Vibration and friction are the: most COITlmOn causes of
static that could affect cabling associated with D ECdataway. In planning the cable route, ensure that
the cable is installed in areas where vibration of cable carriers and mountings is at a minimuln.
2.4 ELECTRICAL CONSIDERATIONS
The following ground considerations pertain to cable routing and maximuln lengths, junction box tie
points, safety precautions, and future expansion provisions.
2.4.1 Ground Requirements
Ground requirements as they relate to the PDP-Ii system are presented in detail in respective system
manuals provided with each shipment. This discussion relates to proper grounding prac:tices that apply
to the DECdataway cable and junction/pull boxes.
The outer shield of the cabh~ must be grounded near, but not to, the COlllputer syst(~m chassis. The
ground conductor should be connected to one of the following.
• Cold water pipe electrode
• Power service conduit
• Service equipment enclosure
• Grounding electrode of the power service of a multigrounded neutral power system.
2-2

If it is not possible to ground the cable shield by any of these methods, one of the following methods
may be used.
• An electrode of not less than 6.096 m (20 ft) of bare copper conductor, no smaller than 4
AWG, encased in at least .0508 m (2 in) of concrete and located near the bottom of a concrete
foundation footing that is in direct contact with the earth.
• An effectively grounded metal structure.
• An extensive underground gas piping system where acceptable to both the servicing gas supplier and to the authority having jurisdiction.
• A ground rod or pipe driven into permanently damp earth.
WARNING
Under no circumstances shall the grounding conductor be connected to a steam or hot water pipe, a
lightning rod conductor, or pipe or rod electrodes
grounding, other than multiground neutral power circuits.
Lightning protection should be installed in cases where the cable is routed from one building to another. Methods should conform to the requirements of the Lightning Protection Code (NFP A 78)
issued by the National Fire Protection Association.
2.5 CABLE ROUTING CONSIDERATIONS (Figure 2-2)
It is imperative that cabling be installed in such a way as to protect it from damage from excessive heat,
moisture, or mechanical stress. Preferably cables should be enclosed in a metal conduit, but metal
troughs are acceptable. Rigid steel conduits afford better noise protection than the thin wall type.
Conduit runs must be laid to avoid low points where moisture could accumulate. All cabling should be
carefully located to avoid coupling from sources of high-intensity electrical transients such as large
motors. Additional information is provided in Chapter 3, Installation.
TERMINATION BOX

PULL BOX

200 n, v.w, 5%, CC LINE DECDATAWAY
TERMINATION RESISTOR FOR SEGMENTED
DEC PIN 1311522
MAINTAINABILITY

JUNCTION
BOX

TERMINATION
BOX

r--r--r--, 200 n , V.W, 5%, CC
LINE TERMINATION
RESISTOR

SHIELD
TO
EARTH
GROUND
NEAR
HOST

CONTROLLER
ISB11-A
DPM
HOST

SHIELD IS AC
GROUNDED
IN EACH
DEVICE

NOTES:
1. DO NOT ATTACH SHIELD TO JUNCTION BOXES.
SHIELD MUST BE DC GROUNDED AT ONE POINT NEAR THE HOST.
2. CABLE MAY BE RUN IN GROUNDED CONDUIT FOR INCREASED
EMI PROTECTION, BUT DO NOT CONNECT SHIELD TO CONDUIT.
3. TOTAL CABLE LENGTH IS THE SUM OF ALL LENGTHS OF CABLE
USED. THE TOPOLOGY IS ELECTRICALLY PERFECT IN LINEARITY.
4. THE SHIELD IS AC GROUNDED VIA 0.78 MICROFARAD CAPACITORS
AT EACH PORT TO MAXIMIZE HIGH FREQUENCY SHIELDING. THEY
PREVENT 50/60 HZ FROM ENTERING THE SHIELD. THE CAPACITORS
ARE PROVIDED IN EACH DECDATAWAY PORT DEVICE, THEY ARE
NOT CUSTOMER INSTALLED.

Figure 2-2

Cable Routing

2-3

BELDEN 9182 CABLE
TWISTED PAIR

~@22
.',

']"

SHIELD

To obtain the ultimate benefits of accuracy, cabling between the system and the peripherals or terminals should be given the same care as with any highly accurate process instrument. Good cable-routing
practices are an extremely important part of reducing noise problems. ~,faintaining themaxirnum
practical separation between electric power conductors and the DECdataway cable protects the actualsignals being transmitted by the cable from noise coupling.
As indicated in Chapter 1, DIGITAL recommends the use of Belden 9182 cable. A shielded, twisted
pair of 22 AWG conductors (~an be used. The maximum length from the ISBII-A to all DECdataway
ports is 4572 m (15,000 ft), including the length contributions of drops frorn the trunk as indicated in
Figure 2-2. This length applies to Belden 9182 only.
2.6 SAFETY PRECAUTIONS
The site preparation and planning guidelines in this chapter, the installation procedurc!s in Chapter 3,
and the user maintenance information in Chapter 4 have been prepared to ,ensure optimum operation
and reliability of DECdataway and also provide protection to operating pc!rsonnel. Please read these
chapters thoroughly prior to installing and maintaining the system.

2-4

CHAPTER 3
INSTALLATION

3.1

INTRODUCTION
CAUTION
Read Chapters 2 and 3 thoroughly prior to installing
the DECdataway subsystem.

Installation of the DECdataway subsystem is divided into two parts. The first, section 3.2, discusses
the DECdataway cable and its connections to the DECdataway controller and to the DECdataway
ports of terminals and peripherals.
The second, section 3.3, discusses the DECdataway controller (ISBII-A). This includes setting of
address and vector switches on the KMCII-A Microprocessor module (M8204) and the Line Unit
module (M 8202-YE).
Diagnostic checkout procedures for stand-alone and system acceptance are also included.

3.2

DECDATAWAY CABLE

3.2.1 Introduction
Installation procedures, guidelines, and recommendations are provided in this section to ensure proper
installation and operation of the DECdataway.
Prerequisites for proper installation are:
• Planning the physical location of the PDP-II and all terminals.
• Providing a maintenance area as close to the host system as possible.
• Generating a map of cable routing.
• Selecting a cable that conforms to the cable specifications given in Chapter I.
• Ensuring that cable routing is within an environment that meets standards specified by the
vendor.
• Procuring the proper hardware and tools necessary to perform the installation and checkout
procedures.

3-1

READ CHAPTERS
2 & 3 THOROUGHLY
PRIOR TO PERFORMING
INSTALLATION

PAR. 3.2.3

L.-;.;.;;;":;';;;';~_--'

-RE·jiEWC)F--.,.-----'--..., ~
ROUTING RULES

J-

(

CHECK OFF
EACH STEP
WHEN COMPLETED

("\

,""PAR. 3.2.4

<JAR. 3.2.4.1

--------~--.--~

~=~"------'

INSTRUCTIONS MAY
BE EXECUTED PRIOR

PAR. 3.2.4.2 ( : )

;rNOS~~~~!~~~NTERMINAL L---_-...-_--'
CONTINUE FROM
THIS POINT ON
FOLLOWIN3
INSTALLAllON &
CHECKOU-OF SYSTEM &
TERMINAU;

1...----...-----' <JAR. 3.2.4.3 ( )

~AR. 3.2.4.3.1(]
'---~~---'

~AR. 3.2.43.2(~
'---~...,...~--'

Figure 3-1

Installation Flowchart

3.2.2 Installation Sequence
Installation is performed in the step-by-step procedure reflected in the flowchart of Figure 3-1. Read
each step carefully, perform indicated operation, then check off the corresponding block in the flowchart upon its completion.
3.2.3 Cable Lengths Required (Figure 3-2)
With reference to Chapter 2 and the map layout (prerequisite), make a detailed floor plan that must
include:
• The physical location of the PDP-II.
• The physical location of each terminal.
• The length of cable n~quired from the controller in the PDP-II cabinet to the first terminal.
Allow enough slack at both ends of the cable for servicing (service loop).
• The length of cable required between each terminal, again allowing for service: loops.
• The length of cable required from the controller to the maintenance area if closc::r than the first
terminal. The maintenance area is to be treated as another terminall connection.
• All cable lengths are to be clearly identified on the floor plan.
NOTE
Genlerate a floor plan for each controller and associ··
ated terminals.
3-2

UPPER FLOOR
LEVEL

1-"----152.5 m (600 f t ) - - - - + _ - - - - - 1 5 2 . 6 m (600 f t ) - - - - - - - i

TO OTHER
~BUILDING
POSSIBLE ROUTING .
TO OTHER TERMINAL$
MAY BE DIFFERENT
LOWER FLOOR FLOOR LEVEL OR
LEVEL
OTHER BUILDING
(SEE FIGURE 2-1 IN
CHAPTER 2)

---- -

CABLE ENTRY
AT BOTTOM OF
CABINET

NOTES:
1. TOTAL CABLE LENGTH SHOWN IS 335 m (1100 It) THE SUM
OF A THROUGH H (I.E .. AB + BC + CD + DE + EF + FG + GH =
20' + 500' + 20' + 20' + 500' + 20' + 20' = 1100'). TOTAL LENGTH
FROM TERMINATION TO TERMINATION IS NOT TO EXCEED
4.5 KM (15.000 ft).
2. REFER TO INSTALLATION PROCEDURES SUPPLIED WITH
PDPll SYSTEM AND TERMINALS PURCHASED TO
DETERMINE CABLE LENGTHS REQUIRED AT
RESPECTIVE LOCATIONS.

3. DETERMINE TOTI'-L CABLE LENGTH REQUIRED
USING MAP LAYOUT INCLUDING SLACK REQUIRED
TO ALLOW FOR CABLE CONNECTOR ACCESSIBILITY
AND TENSION-FREE CONNECTIONS.
4. DETERMINE TOTAL CABLE LENGTHS FOR EACH
APPLICATION OF ADDITIONAL CONTROLLERS
WITH A MAXIMUM OF FOUR.
5. TWO POSSIBLE CONFIGURATIONS ARE SHOWN
IN FIGURE 1-' O~ CHAPTER 1

Figure 3-2

Total Cable Length

3.2.4 Cable Mounting
It is the customer's responsibility to ensure that the cable is routed in accordance with the cable';'
routing practices described in Chapter 2. The cable recommended by DIGITAL is the Belden 9182
shielded, twisted pair. To ensure satisfactory cable performance, cable must be routed away from
electrical power equipment and lighting fixtures to avoid electrical and electromagnetic interference.

For more interference information pertaining to various noise sources and noise measurements, refer
to the DECdataway Noise Specification listed in Applicable Documents, Paragraph 1.3.6 of Chapter
1.
It is also recommended to keep all cabling away from the following at the minimum distance indicated:

• Fluorescent, incandescent, and neon lighting fixtures: 1 m (3.3 ft).
• Power wiring, transformers, generators, and alternators: 3.05 m (10 ft).
• Air conditioners, elevators, escalators, large blowers, and machine tools: 3.05 m (10 ft).
• Radios and televisions: 91.44 cm (3 ft).
• Intercommunication systems and security signal systems 91.44 cm (3 ft).
• RF stabilized arc welders: 4.3 m (14 ft).
• 3 KW plastic welders: 14 m (45 ft).
• 3 KW wood gluers: 14 m (45 ft).
• 12 KW plastic preheaters: 4.3 m (14 ft).
• RF induction heaters: 7.3 m (24 ft).
• Automotive induction noise: 3.7 m (12 ft).
3-3

• Transmitting systems (e.g., commercial broadcast, citizen radio, navigation, radar, and relay
communications) with the following output power.
50KW:
100W:
5W:

2000 m (6600 ft)
100 m (330 ft)
20 In (66 ft)

Cabling between buildings nlust be:
• In earth protected conduit if run underground.
• Protected against strain and lightning as required by the national electrical and local c:odes if
run overhead.

3.2.4.1 DECdataway Assembly Items Required - Table 3-1 lists the tools and supplies required to
assemble a DECdataway system.

Table 3-1
Item

DECdataway Assembly Items

Descriptiol1l

Part No.

Quantity

Pin extraction tool

AMP 305183

Pin insertion tool

AMP 91002-1

Crimping tool

AMP 90277-1

Termination resistors (200 n,
1/4 W, 5%, cc)

DEC 13-11522

2 per cable

Cable

Belden 9182 is
recommended.

A/R

Conduit, junction boxes, pull
boxes, and mounting hardware

A/R

Electrical assembly hand tools (Le.,
wire strippers, small Phillips screwdriver, and knife or cable stripper)

1 each

Electrical supplies (Le., electrical
tubing, vinyl tape, cable tie wraps,
etc.)

A/R

VO M or DVM (see Table 4-1)

3-4

3.2.4.2

Installing Cable Runs and Associated Hardware

• Refer to the detailed floor plan and install conduits or troughs with required hardware including pull boxes. Recommended distance between pull boxes is approximately 30.48 m (100 ft). A
90 0 conduit bend is equal to 9.14 m (30 ft) of a straight conduit run. All pull boxes must be
grounded in compliance with local and municipal electrical codes.
• Measure and cut required cable length for first run (from controller to service area or first
terminal, whichever is the closest).
• Using a VOM or DVM, measure dc resistance of the cable wires with the far ends shorted
together (refer to vendor cable specifications). Make a table to record same and keep for future
reference as shown in Table 3-2 example format.
Table 3-2
Run

Length

Cable Measurements Example
DC Resistance

Propagation Delay*

From

(ft)

Spec

Free

Installed

Spec

Free

Controller

Service
Area

100

Xns/ft

XH/ft

Controller

Terminal
No. I

Xft

Xns/ft

XH/ft

Terminal
No.8

Terminal
No. 20

Xft

Xns/ft

XH/ft

Installed

NOTE
100 ft = 30.48 m
*This block applies only if TDR is used
tRecord prior to installation
:j:Record following installation

• Time Delay Reflectometry (TDR) techniques provide a useful tool and may be used in checking a possible defect in a long cable run. If TDR is to be used, it will be useful in future
maintenance to have data taken when the cable is installed. For further information on TDR,
refer to the maintenance chapter in the DECdataway Technical Manual (EK-ISBII-TM).
• Extra DECdataway cable should be kept on hand or easily available for replacement due to
maintenance. It should be stored in an environment that is recommended by the manufacturer.
• Install first cable run. An antifriction agent should be used to avoid excessive tension on the
cable when pulling cable through a conduit, provided that the agent is not damaging to the
cable jacket. Great care should be exercised in pulling cable through sharp bends in the conduit
where tension may be increased and cause conductor to short circuit to shield.
• Following installation of the first run, repeat dc resistance and record measurement under
"Installed" column in Table 3-2. If cable was installed properly, measurements should not
differ from those recorded prior to installation.
3-5

• Refer to Figure 4-1 in Chapter 4, User's Maintenance, and check for shorts between:
Cable wires (2)
Each cable win: and shield
Shield to conduit (except section connected to ISBII-A).
• Repeat foregoing procedure for each cable run.
3.2.4.3 Cable Connections - Each DECdataway consists of a continuous, homog1enous length of
shielded, twisted pair cable (DIG IT AL recommends Belden 9182) with a 200 n ternlination resistor
fixed across the signal pair at each end. Each DECdataway has one "DECdataway Controller Connector" and from one to 63 "DECdataway Port Connectors" as required by the application. If the
customer has chosen to cover his RT8XX terminals under the FDM Addcmdum, on<: port connector
must be dedicated to the maintenance area. The controller connector may be placed anywhere along
the length of the cable. The port connectors may also be placed anywhere along the length of th!e cable.
The only restriction on how close together port connectors may be placed is the need for sufficient
slack to enable servicing the terminals conveniently. DIGITAL recommends a minimum of 3.05 m (10
ft) of cable between port connectors. The maximum total length of cable permitted is 4572 m (15,000
ft), if Belden 9182 is used. The maximum length of cable is not specified for any other cable type.
There is only one controller for each DECdataway, therefore no address selection i~: necessary. The
addresses of the DECdataway port connectors are set by jumpers inserted in each port I:;onnector at the
time of installation. This arrangement, along with the fact that the DECdataway is a. true multidrop
communications line, will allow terminals to be removed from and replacf~d on the line for servicing
without disturbing the D ECdataway operation.
An installation kit may be purchased from DIGITAL, containing all parts., special tools, and instructions necessary to install an average-sized DPM DECdataway system. Table 3-3 specHles parts for the
two kits available. The DPMXX-A kit contains all the parts and special tools (except wire) necessary
to build two controller connectors and twenty port connectors. The DPMXX-B kit contains the same
types and quantities of parts as DPMXX-A, except there is no crimping tool included. The number of
kits required for each type of DPM system is detailed in Table 3-4 with the kits to be purchased.

Table 3-3 Parts List for DPMXX-A

Item

Descril)tion

Part No.

1
2
3
4

Port Plug
Port Cable Clamp
Cable Contact
Port Address Contact
Extraction Tool
Insertion tool
Crimping Tool·
Controller Plug
Controller Cable Clamp
Controller Contact
Termination Resistor

AMP 206037-1
AMP 206322-1
AMP 66592-2
AMP 66594-2
AMP 305183
AMP 91002-1
AMP 90277-1
AMP 206153-1
AMP 206358-1
AMP 66589-2
DEC 13-11522

6
7
8
9
10
II

*For DPMXX-B, Delete Item 7.

3-6

Quantity
20
20
100
240
1
I
I
2
2
1O
4

Table 3-4 D PMXX Installation Kits
For System Type

With Number of Ports

Purchase

DPM 61 or 64

1- 20
21- 40
41- 60
61- 80
81 - 100
101 - 120
121 - 126

I DPMXX-A
I DPMXX-A + I DPMXX-B
I DPMXX-A + 2 DPMXX-B

1- 20
21- 40
41- 60
61- 80
81 - 100
101 - 120
121 - 140
141 - 160
161 - 180
181 - 200
201 - 220
221 - 240
241 - 256

I DPMXX-A
I DPMXX-A + I DPMXX-B
I DPMXX-A + 2 DPMXX-B

DPM 84 or87

I DPMXX-A + 3 DPMXX-B

I DPMXX-A + 4 DPMXX-B
I DPMXX-A + 5 DPMXX-B
I DPMXX-A + 6 DPMXX-B

I DPMXX-A + 3 DPMXX-B
I DPMXX-A + 4 DPMXX-B
I DPMXX-A + 5 DPMXX-B
I DPMXX-A + 6 DPMXX-B
I DPMXX-A + 7 DPMXX-B
I DPMXX-A + 8 DPMXX-B
I DPMXX-A + 9 DPMXX-B
I DPMXX-A + 10 DPMXX-B
I DPMXX-A + 11 DPMXX-B
I DPMXX-A + 12 DPMXX-B

A DPMXX-A may be substituted for any DPMXX-B kit if more than one set of tools is desired.
Instructions for connecting the DECdataway cable to its respective connectors are presented in two
parts: connection to the controller connector and connection to the port connector.
3.2.4.3.1 Connection to the Controller (refer to Figure 3-3 and Table 3-5) - Perform the following steps
when connecting the DECdataway cable to a controller.
1.

Locate the two DECdataway cable ends in the DPM Systems area and cut them off evenly.
Ensure that the finished connector will reach the controller pigtail inside the system cabinet
with enough slack, approximately 1.52 m (5 ft) for the BAll mounting rack to be pulled out
for service.

2. Strip back the sheath of both cable ends 7.5 cm (3 in), and remove the foil sheath and filler.
3. Slide one 50 mm (2 in) length of insulating tubing over both cable ends, holding them
together.
4. Join both drain wires together. Insulate them with a piece of tubing 7 cm (2.75 in) long, and
crimp them together in one male pin (AMP PIN 66589-2), using AMP tool PIN 90277-1.
5. Strip 2.54 cm (l in) of insulation from each of the four signal wires.
6. Twist each pair of like color wires together (black to black and yellow to yellow) and cover
each pair of bare wires with a piece of tubing (heat shrinkable preferred), 20 mm (0.75 in)
long.
3-7

PLUG
AMP PIN 206153-1

BLACK PAIR

~:~N~2 ~

YELLOWPAIR~ ~

MALE PINS

~AMPP/N

2~3

66569-2

EMPTY

DRAIN PAIR
PLUG
AMP PIN 206153-1

MALE PINS
AMP PIN 66569-2

Figure 3-3

DECdataway Controller Connector

llable 3-5 Controller Connection Parts List
Item

Description

Part No.

1
2
3

Plug
Clamp
Nlale Pins

AMP 206153-1
AMP 206358-1
AMP 66589-2

Quantity
1
1
3

7. Crimp the two bla,ck wires together into one male pin using the AMP tool (AMP PIN
90277-1).
8. Repeat step 7 for the yellow pair of wires.
9. Slide the cable clamp (AMP PIN 206358-1) over the assembled cable end. Make sure all
three pairs (yellow, black, and drain) are inside the clamp body.
10. Insert the three male pins into the controller plug (AMP PIN 206153-1), using the insertion
tool (AMP PIN 91002-1). Observe color coding as follows: black pair to 1, ydlow pair to 4,
and drain pair to 3. Pin 2 is not used (see Figure 3-3).
11. Slide the cable clamp body up to the plug and screw both parts together.
12. Slide the 50 cm (2 in) length of tubing (from step 3) up to the cable: clamp body and insert it
into the body far enough so that it will be secured by the cable clamp.
13. Select the right size clamp and secure it to the cable clamp body using both screws provided.
Tighten the clamp sufficiently to provide strain relief for the pin connections. Secure the
tubing with a tie wrap.
3-8

14. Inspect the controller connector assembly and label as necessary (1,2, 3, or 4). Should any
pins need to be removed from the plug, use the AMP extraction tool (AMP PIN 305138).
NOTE
It does not matter electrically which signal pair
(black or yellow) goes to which pin (lor 4). However, following a standardized connection scheme (as
recommended here) will facilitate cable maintenance.
3.2.4.3.2 Connection to One DECdataway Port (refer to Figure 3-4 and Table 3-6) - Perform the
following steps when connecting the DECdataway cable to one port.
NOTES
1.

For best throughput, port address selection
should start at address 1 and run continuously
through the highest address to be used on each
DECdataway. If the RT8XX terminals are covered under the FD M Addendum service agreement, address 1 is recommended for the
maintenance area. Otherwise, the physical location of addresses is not restricted and any address location scheme that is convenient for a
given application may be used.

It should also be noted that the DPMOI contains four addresses and that the D PM50 contains two addresses. If these devices are used,
then the total number of devices on the line
would be less than 63. The port connector
should be wired for the lowest of the allocated
addresses (e.g., if a DPMOI is used and is allocated for addresses 1 through 4, then address 1
would be wired in the connector and addresses 2
through 4 should not be used by any other device).

THE JUMPER CONFIGURATION

BLACK PAIR

PLUG

YELLOW PAIR
BLACK
PAIR

PLUG
AMP PIN

206037-1

CABLE CONTACTS
(FEMALE)

66592-2

Figure 3-4

DECdataway Port Connector

3-9

Table 3-6
Item

Port Connection Parts List

Description

Part No.

Quallltity

Plug

AMP 206037-1

Clamp

AMP 206322-1

Cable Contact

AMP 66592-2

Address Jumper
Contact

AMP 66594-2

0-12AjR

Address Jumper Wire
(22 A W G Stranded)

Any

AjR

Refer to Table 3-6 and Figure 3-4 and assemble the required parts.

Make from 1 to 6 address jumpers as required; refer to Table 3-7 fol' addressing information.
Cut the required number of jumpers from 22 AWG stranded wire. Crimp a femak~ pin
(AMP PjN 66594-2) on each end of each jumper, using AMP tool (AMP P/N 90277-1).

3. Insert the jumpers into the plug (AMP P jN 206037-1). Refer to Table 3-7 and Figure 3-4 for
jumper locations.
4.

Label the clamp body (AMP P jN 206322-1) clearly with the seh~cted addre:ss in dedmal
numbers.

Locate the two cut ends of the DECdataway cable at the physical port location. Cut the ends
off evenly, ensuring sufficient slack, about 1.22 to 1.52 m (4 to 5 ft) for a service loop. This
will allow convenient servicing of the DECdataway device.

6. Strip 3 cm (1.25 in) of sheath from each cable end. Remove the exposed foil shidd and filler.
7. Strip 1.6 cm (5j8 in) of insulation from each black and yellow signal wire.
8. Join the two drain wires together and insulate them with a 2.5 cm (1.0 in) long piece of
tubing.
9. Join the pair of black signal wires together and insulate them with 2 cm (0.75 in) long piece
of tubing (heat shrinkable preferred).
10.

Repeat step 9 for tht: yellow pair.

11. Crimp each pair (drain, black, and yellow) into one of the three cable contaet female pins
(AMP P jN 66592-2).
12. Slide the cable clamp (AMP P jN 206322-1) over the assembled cable end, en:;uring that all
three pairs (drain, black, and yellow) are inside the cable clamp body.

3-10

Table 3-7

DECdataway Port Address Selection
(See legend at end of Table.)

Address
Octal/Decimal

1
2
3
4
5
6
7
10
11
12
13
14
15
16
17
20
21
22
23
24
25
26
27
30
31
32
33
24
35
36
37
40
41
42
43
44
45
46
47
50
51
52
53
54
55

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45

Pin Locations
78
910

13 16

12 15

No.

3-11

JMP

5
5
4
5
4
4
3
5
4
4
3
4
3
3
2
5
4
4
3
4
3
3
2
4
3
3
2
3
2
2
1
5
4
4
3
4
3
3
2
4
3
3
2
3
2

Table 3-7

DECdataway Port Address Selection (Cont)
(See legend at end of Table.)

Address
Octal/Decimal
56
57
60
61
62
63
64
65
66
67
70
71
72
73
74
75
76
77

Nt ).

Pin Locations
34

910

12 15

46
47
48
49
50
5]
52
53
54
55
56
57
58
59
60
6]
62
63

13 16

JM[P

-- - -

"II

]

_,l'
3
2:

_,l'
"I

_,l'

]
]
(

]

2'
""I

]

""I

LEGEND

13.

Address 0 is reserved for the system broadcast.

- = Jumper In (Logic 0)

(Blank space) = Jumper out (Logic 1)

This pattern of physical addresses is duplicated
for each DECdataway on a DPM system.

Using the insertion tool (AMP PIN 91002-1), insert wires into the plug as follows: The black
pair in 11, the yellow pair in 14, and the drain pair in 1.

NOTE
Pin 2 is not used. The other pins
(3,4,5,6,7,8,9,10,12,13,15,16) will be used according
to the port address selected. The orientation of the
signal pair, black to 11 and yellow to 14, is not electrically significant. However, maintaining a standardized wiring scheme, as recommended, will
facilitate cable maintenance. Refer to Figure 3-4.
14. Slide the cable clamp up to the plug and thread the two parts toge:ther tightly.
3-12

15. Select the right size clamp and secure it to the clamp body with both screws. Tighten the
clamp sufficiently to provide strain relief for the cable pins.
NOTE
A possible variation of this procedure would be to
assemble the required port connectors before the
cable installation, using short lengths of cable, 1.52
to 6 m (5 to 20 ft). Then connect the preassembled
and preaddressed port connectors into the D ECdataway cable using butt splices or screw terminal strips.
Important considerations in this case would be to ensure a continuous run of a homogeneous cable type
and to observe color coding when making cable
splices. It is recommended that crimp-type wirenuts
(P IN AMP 330718 or 35115) be used for splices on
the DECdataway cable.

3.3

ISBII-A DECDATAWAY CONTROLLER

3.3.1 Introduction
This section describes the hardware and software necessary to install and check out the ISB ll-A
controller. Acceptance test procedures are performed on the controller as a stand-alone entity and also
when the controller is connected to a DECdataway port, using a test cable.
3.3.1.1 ISBII-A Hardware - The hardware that makes up an ISB l1-A controller is listed in Table 38. Items 1 through 4 are shipped as part of the controller and items 5 through 7 are part of the host
system.
Table 3-8

ISBII-A Hardware

Item

Hardware

Description

1
2

M8204
M8202-YE
BC08S-01
70-14152
DDII-C or DDII-D
DPM61, 64,84, or 87
RT801, 803, 805, DPMOI, or DPM50

KMCII-A Microprocessor
ISB ll-A Line Unit
Interconnection Cable
ISB ll-A Test Cable
Backplane
System
DEC Dataway Peripheral

3
4
5
6
7

3.3.1.2 ISBII-A Software - The software package shipped with the ISB11-A controller for standalone checkout is the LIBKIT ZJ234-RB, and it contains the following diagnostics:
MAINDEC-II-DZKCA
MAINDEC-II-DZKCC
MAINDEC-II-DZKCD
MAINDEC-II-DZKCE
MAINDEC-II-DZKCF

3-13

The software diagnostics used in checking out the ISBII-A at the system level are:
DEC/XII with the KN[CII module (MAINDEC-II-DXKMC)
NOTE
Anyone of the following may be used.
MAINDEC-II-DZQRA-A-HC
MAINDEC-II-DZQRA-A-DC
MAINDEC-II-DZQRA-A-MC9
3.3.1.3 Acceptance Procedures - The acceptance procedures are discuss(~d in three separate: paragraphs: a physical check, a stand-alone diagnostic, and a system diagnostic.
3.3.1.3.1

Physical Check
NOTE
This procedure is written in case modules M8204 and
M8:Z02-YE are not installed prior to shipment. 1111
most cases they are installed, and this procedure call1
be c:hecked for accuracy ~

Determine the backplane slots where the M8204 and M8202-YE modules will be located.
NOTE
These modules are to be firmly seated adjacent to
each other in hex SPC slots (discussed later in this
proc!edure) in a DDII-C or DDII-D backplane.

On the backplane, check that the supply voltages are within the following tolerances.
Min

Voltage
Nominal

Max

BackpblOe
Pin

+4.75
-14.25
+14.25

+5
-15
+15

+5.25
-15.75
+15.75

C1A2
CIB2
CIUl

The NPG grant continuity wire from CAl to CBI must be remov,ed from the: backplane slot
where the M8204 module is to be located.

Set the ISBII-A to the following addresses by setting M8204 switches as shown for the
appropriate system..
System

Address

Vector

DPM61 and DPM64 760140
760150

400
410

DPM84 and I>PM87 760140
760150
760160
760170

400
410
420
430

3-14

Set M8202-YE switches on all three switch packs to OFF.

Insert both modules (M 8204 and M8202-YE) firmly into the backplane per information
given in Step I.

Connect JI of the M8204 to JI of the M8202-YE using BC08S-01 interconnection cable.

Repeat step 2. If adjustments are required, refer to DECdataway Instruction Manual
(EK-ISBII-TM).

3.3.1.3.2 Standalone Diagnostics
1.

Create a chain under XXDP of the following diagnostics in the order shown:
MAINDEC-II-DZKCC
MAINDEC-II-DZKCD
MAINDEC-II-DZKCA
MAINDEC-II-DZKCE
MAINDEC-II-DZKCF

If an RK05 is used for the diagnostic medium, a normal XXDP chain will fail to continue
properly after DZKCC and DZKCA. This is because they test the KMCII-A ability to
force AC LO. Insert several lines of console printing in the chain file immediately following
diagnostics DZKCC and DZKCA. This allows the RK05 enough time to recover. Otherwise, an RK05 device error will be indicated on the XXD P monitor.

R un each diagnostic for at least three passes, whether they are run from an XXD P chain file
or run separately.

Set the switch register to 00000. Each diagnostic will auto-size the system, report the
ISBII-As at nonstandard floating addresses, and proceed to run all the ISBII-A on the
system.

3.3.1.3.3 System Diagnostics - The system diagnostics are divided into two categories: a DEC/X!'I
and a user mode.

DEC/XII
1.

Load DEC/XII and run for one half hour.

NOTE
For DPM6X systems, one KMCll module is
needed.
For DPM8X systems, two KMCll modules are
needed.
2.

Set the NPR rate for 14 ,us/NPR.

Set the NPR/BR rate to 30 NPR/BR.

Set SR 1 bits 13 and 12 to 0 for both transmit and receive NPRs

3-15

User Mode

Because the ISB ll-A protocol is half duplex, a full system test requires that the controller be connected
to one or two DECdataway peripherals and the Serial Bus Exerciser (MAINDEC-II-DZKCH) be
run. The procedure will vary according to the type of DPM system being used.
The procedures are as follows:
1.

For each ISBII-A to be tested, obtain one or two DECdataway peripherals.

Make sure that they have been checked using their ROM residtmt diagnostic. Refer to the
Remote Terminals RT801, 803, 805 User's Guide or DPMOI User's Guidl~ for details.

Connect the peripherals to the controller using the ISBII-A test cable (70-14152) provided
with the host syst(!m.
NOTE
Thle two port connectors of the test cable are wir,~d
for addresses 1 and 2.

The variations in procedure are due to the different media used on the different DPM systems. Each RSXII-M test pack contains an RSX11-M operating system image for a minimum configuration DPM system.
Each test pack will contain two diagnostic tasks (MAINDEC-l1··DZKCH and MAIl'lDECll-DZKCI) and will be shipped on a medium appropriate for t.he target system:
MAINDEC-ll-DZQRA-A-HC on RK05 for DPM61-A
MAINDEC-ll-DZQRB-A-HC on RK05 for DPM61-B
MAINDEC-l1-DZQRA-A-DC on RK06 for DPM64-A and 84-A
MAINDEC-l1-DZQRB-A-DC on RK06 for DPM64-B and 84-B
MAINDEC-II-DZQRA-A-MC9 on 9-track magtape for DPM87-A
MAINDEC-II-DZQRB-A-MC9 on 9-track magtape for DPM87-B

For DPM61, 64, and 84 systems: Boot the disk pack containing the user :mode diagnostic
package and run the serial bus exerciser (MAINDEC-II-DZKCH) for one hour, without
errors.

For DPM87 systems: Boot the user diagnostic package magtap(~ and transfer the operating
system onto the RP06 using the instructions provided with the tape.
Boot the RP06 and run the serial bus exerciser (MAINDEC-II-DZKCH) for one hour,
without errors. This requires a scratch RP06 disk pack. This disk pack is shipped with the
system.

3-16

CHAPTER 4
USER'S MAINTENANCE

4.1 INTRODUCTION
User's maintenance consists mainly of preventive maintenance. This chapter provides a description of
the D ECdataway preventive maintenance that can be performed by the customer and includes a list of
tools and test equipment required. A maintenance node should be provided by the user in the event
maintenance is required by a DIGITAL Field Service engineer.
4.2 PREVENTIVE MAINTENANCE
Preventive maintenance consists of periodic inspection of the DECdataway cable and connections as
well as running diagnostic tests at periodic intervals to ensure proper equipment operation and minimum unscheduled down time.
4.2.1 Cable Inspection
For maintenance purposes, the user should keep a record of the initial cable characteristics that were
taken during installation, as shown in the example in Chapter 3 (Table 3-2).
After the system becomes operational, record the received signal amplitude at the furthest terminal
from the ISBII-A controller. This measurement should be repeated and recorded periodically at specified times. If there should be a 20 percent deviation in the signal amplitude, then the following steps
should be taken.
1.

Disconnect the cable section furthest from the ISBII-A.

Disconnect all terminals in that section from the cable.

Disconnect termination resistor, if applicable.

Measure both open and short circuit resistance of that cable section. Refer to Figure 4-1 and
check for shorts between:
Cable wires (2)
Each cable wire and shield
Shield to conduit (except section connected to ISBII-A).
WIRES (2)
BLACK & YELLOW

CONDUIT

CABLE
JACKET

Figure 4-1

MA-1377

Cable Check Points for Shorts

4-1

If the resistance indicates less than 20 MO, inspect cable for contamination of the dielectric
or wear from sharp bends, stress points, aging, or excess heat exposure.

If the circuit resistance indicates a higher reading than the one recorded at the thne of
installation, then inspect the cable for loose or contaminated connectors and excessive tension.

Repeat steps 1 through 6 for each cable section back to the ISBII-A.

4.2.2 Diagnostics
The DECdataway subsysteml consists of eight diagnostic tests. The diagnostic proces,s begins with a
statement of the problem. An attempt should then be made to categoriz(~ the problem as ISBl1-A
related, DECdataway relatedl,· or terminal related. If this cannot be determined, running the diagnostics in the order shown next will isolate and classify the problem.
Detailed discussions of the (~ontent, use, and interpretation of each diagnostic is dOt~umented separately. The documents and programs are shipped with the system. The order in which diagnostks must
be performed is as follows:
The first five tests listed here are stand-alone diagnostics and must be performed first and in the order
given.
MAINDEC-II-DZKCC: Basic R/W and Microprocessor Tests
MAINDEC-ll-DZKCJ): KMCII Low Speed Jump and Memory Tests
MAINDEC-II-DZKCA: KMCII CPU Micro-Diagnostics
MAINDEC-II-DZKCE: DDCMP Mode Line Unit Tests
MAINDEC-II-DZKCF: Bit stuff Mode Line Unit Tests
The following three tests listed are performed on a system level and must also be p'~rformed in the
order given, following the stand-alone tests.
MAINDEC-II-DXKM:C: KMCII DEC/XII Exerciser Module
NOTE
Th(~ following diagnostics are run on-line under the

RSX-IIM software operating system.
MAINDEC-II-DZKCH: Serial Bus Exerciser
MAINDEC-II-DZKCJ: Remote Terminal Exerciser.
4.3 TOOLS AND TEST EQUIPMENT
Tools and test equipment u.sed for preventive maintenance, diagnostic tc~sting, and installation are
listed in Table 4-1. This is in addition to standard hand tools (e.g., screw drivers, pliers, etc.).

4-2

Table 4-1

Tools and Test Equipment

Equipment

Manufacturer

Part No./Reference

Multimeter (VOM)
or
Digital Voltmeter (DVM)

Triplett or Simpson

Model 630-NA or 260

Fluke

Mode18040A

Oscilloscope

Tektronix

Type 453 or equiv.

XIO probes (2)

Tektronix

P6OO8

Extraction tool

AMP

305183

Insertion tool

AMP

91002-1

Crimping tool

AMP

90277-1

Software
Diagnostic tools

DIGITAL

See Par. 3.3.1.2

4-3

U~l:UATA WAY

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