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EK-DECDT-IN-001

September 1991

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Document:	DHT80 Option Installation Guide
Order Number:	EK-DECDT-IN
Revision:	001
Pages:	24
Original Filename:

OCR Text

DHT80 Option
Installation Manual
Order Number EK–DECDT–IN–001

Digital Equipment Corporation
Maynard, Massachusetts

First Printing, September 1991
The information in this document is subject to change without notice and should not be
construed as a commitment by Digital Equipment Corporation.
Digital Equipment Corporation assumes no responsibility for any errors that may appear in
this document.
The software, if any, described in this document is furnished under a license and may be used
or copied only in accordance with the terms of such license. No responsibility is assumed
for the use or reliability of software or equipment that is not supplied by Digital Equipment
Corporation or its affiliated companies.
Restricted Rights: Use, duplication or disclosure by the U.S. Government is subject to
restrictions as set forth in subparagraph (c)(1)(ii) of the Rights in Technical Data and Computer
Software clause at DFARS 252.227–7013.
© Digital Equipment Corporation 1991. All rights reserved.
Printed in U.S.A.
The Reader’s Comments form at the end of this document requests your critical evaluation to
assist in preparing future documentation.
The following are trademarks of Digital Equipment Corporation: DEC, DECnet, DECserver,
DECsystem 5100, DECUS, DECwriter, DELNI, DELQA, DEQNA, DESTA, DSSI, IVIS,
Letterprinter, Letterwriter, MicroVAX, PDP, Professional, Q-bus, ReGIS, RQDX, ScriptPrinter,
ThinWire, ULTRIX, UNIBUS, VAX, VAX 4000, VAXcluster, VAX DOCUMENT, VAXELN,
VAXlab, VMS, VT, and the DIGITAL logo.
FCC NOTICE: The equipment described in this manual generates, uses, and may emit radio
frequency energy. The equipment has been type tested and found to comply with the limits for
a Class A computing device pursuant to Subpart J of Part 15 of FCC Rules, which are designed
to provide reasonable protection against such radio frequency interference when operated in
a commercial environment. Operation of this equipment in a residential area may cause
interference, in which case the user at his own expense may be required to take measures to
correct the interference.
S1729

This document was prepared using VAX DOCUMENT, Version 1.2.

Contents
Preface

Chapter 1 Introduction to the DHT80 Option
Chapter 2 Installing the DHT80 Option
2.1
2.2
2.3
2.4
2.5
2.6
2.7

Shutting Down the System and Removing the DECsystem
5100 Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–2
Removing Blank Cover Plates . . . . . . . . . . . . . . . . . . . . . . . . 2–3
Removing Upper and Lower Drive Shelves . . . . . . . . . . . . . . 2–4
Adding Standoffs and 100-Way Cable . . . . . . . . . . . . . . . . . . 2–7
Installing the DHT80 Option . . . . . . . . . . . . . . . . . . . . . . . . . 2–9
Reconnecting Cables, Drive Shelves, and Tightening Cover . . 2–12
Replacing the DHT80 Option . . . . . . . . . . . . . . . . . . . . . . . . . 2–12

Chapter 3 Testing the DHT80 Option
3.1
3.2
3.3
3.4

Diagnose by Checking the iooption . . . . . . . . . . . . . . . . . . . .
Verifying That the System Sees the DHT80 . . . . . . . . . . . . . .
Testing the DHT80 Internal Mode . . . . . . . . . . . . . . . . . . . . .
Testing the DHT80 External Mode . . . . . . . . . . . . . . . . . . . .

3–1
3–2
3–2
3–3

Appendix A FRUs and Cables for the DHT80 Option

iii

Figures
1–1
1–2
2–1
2–2
2–3
2–4
2–5
2–6
2–7
2–8
2–9
2–10

DHT80 Option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–2
DECsystem 5100 with DHT80 Option Installed . . . . . . . . . . . 1–2
Cover Screw Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–2
Removing Blank Cover Plates . . . . . . . . . . . . . . . . . . . . . . . . 2–3
Wiring Diagram of Upper Drive Shelf . . . . . . . . . . . . . . . . . . 2–4
Removing Upper Drive Shelf . . . . . . . . . . . . . . . . . . . . . . . . . 2–5
Removing Lower Drive Shelf . . . . . . . . . . . . . . . . . . . . . . . . . 2–6
Inserting Five Standoffs on Lower Drive Shelf . . . . . . . . . . . 2–7
Connecting 100-Way Connector to System Board . . . . . . . . . . 2–8
Snapping DHT80 into Place . . . . . . . . . . . . . . . . . . . . . . . . . . 2–9
Attaching Modem Cable to Adapter Plate . . . . . . . . . . . . . . . 2–10
Connecting the Modem Cable and Port . . . . . . . . . . . . . . . . . 2–11

Tables
3–1
A–1

MMJ Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
FRUs and Cables for the DHT80 Option . . . . . . . . . . . . . . . .

3–3
A–1

Preface
This manual provides information for Digital service representatives
on installing the DHT80 Asynchronous Communications option. This
manual also provides customers and Digital service representatives with
information on DHT80 diagnostics.
NOTE: The DHT80 option must be installed and serviced by Digital service
personnel or qualified self-maintenance customers only.
•

Chapter 1 is an introduction to the DHT80 option.

•

Chapter 2 describes the installation procedures for the DHT80 option.

•

Chapter 3 describes the testing of the DHT80 option.

•

Appendix A lists field-replaceable units of the DHT80 and their part
numbers.

Conventions
The following typeface and character conventions are used in this manual:
Convention

Meaning

Return

A key name is shown enclosed to indicate that you press a named
key on the keyboard.

Ctrl/x

A sequence such as Ctrl/x indicates that you must hold down the
key labeled Ctrl while you press another key.

bold

Boldface type indicates user input. For example: >> boot

NOTE

Notes provide general information about the current topic.

CAUTION

Cautions provide information to prevent damage to equipment
or software. Read these carefully.

WARNING

Warnings provide information to prevent personal injury. Read
these carefully.

Chapter 1

Introduction to the DHT80 Option
The DHT80 option adds eight asynchronous lines to the four asynchronous
lines in the DECsystem 5100. Seven of these additional lines are DEC–
423 and have MMJ–type connectors. One RS–232 connector is mounted
remotely to the back of the system enclosure. This port offers full modem
control.
The DHT80 may be factory-installed (DHT80–AA) or field-installed
(DHT80–AF). This guide provides instruction for field-installation of the
DHT80 option and other information.
CAUTION: Use grounding mat or wriststrap to protect against damage
caused by electrostatic discharge.
Figure 1–1 shows the DHT80 option. Figure 1–2 shows the rear view of a
DECsystem 5100 that has a DHT80 option installed.

Introduction to the DHT80 Option

1–1

Figure 1–1: DHT80 Option

100 -Way
Connector for
Signal Cable
from System Module

Captive Screws (3)

26-Way Connector
MLO-007101

Figure 1–2: DECsystem 5100 with DHT80 Option Installed
MMJ Ports 4-7
and Label

MMJ Ports 8-10
and Label

Power Switch

MLO-007102

1–2 DHT80 Option Installation Manual

Chapter 2

Installing the DHT80 Option
NOTE: Installation is to be done only by Digital service representatives or
by qualified self-maintenance personnel.
The sequence for installing the DHT80 option depends on whether any
other option is already installed in the DECsystem 5100. If so, it must
be removed and the DHT80 option mounted in its place. The installation
procedure that follows assumes that no other option is present when the
DHT80 is installed. The following are the steps covered in this chapter:
1. Shutting down the system and removing the DECsystem 5100 cover
2. Removing the blank cover plates (if present)
3. Removing the upper and lower drive shelves
4. Adding standoffs and the 100-way cable
5. Installing the DHT80 option
6. Reconnecting cables, drive shelves, and tightening cover
7. Replacing the DHT80 option

Installing the DHT80 Option

2–1

2.1 Shutting Down the System and Removing the
DECsystem 5100 Cover
1. Perform an orderly system shutdown of the ULTRIX operating system
from the console. Assure there are no system problems with the
command
>>test 0x0

Reference the DECsystem 5100 Maintenance guide for further
information.
2. Set the Power switch to off (0) on the DECsystem 5100 and all expansion
enclosures that are connected to it.
3. Mark and disconnect all cables to the DECsystem 5100.
4. Loosen the two Phillips screws holding the cover. (See Figure 2–1.)
From the rear of the DECsystem 5100, slide the cover forward and lift
it away from the system.
Figure 2–1: Cover Screw Locations

Cover Screw

Cover Screw
MLO-007103

2–2 DHT80 Option Installation Manual

2.2 Removing Blank Cover Plates
If the system has no other option installed, then it has blank cover plates.
Remove the plates as shown in Figure 2–2.
1. Remove the two Phillips screws on the upper blank plate (74–38986–
01), and remove the upper blank plate, as shown in Figure 2–2. Save
the screws.
2. Loosen the captive screw on the lower blank plate (74–41590–01) and
remove.
Figure 2–2: Removing Blank Cover Plates
Upper
Blank Plate

Phillips
Screws(2)

Captive
Screw
Lower
Blank Plate

MLO-006317

Installing the DHT80 Option

2–3

2.3 Removing Upper and Lower Drive Shelves
Removal of upper and lower drive shelves is detailed below.
1. Note the position of the mass storage drives on the upper drive shelf,
and mark the cables accordingly. Disconnect the power cables and SCSI
bus cable( s ) from the drives on the upper drive shelf. (See Figure 2–3
for a symbolic wiring diagram.)
Figure 2–3: Wiring Diagram of Upper Drive Shelf
Adapter (TZ30 Only)
SCSI Connector
to System Module

External SCSI
Connector

Power Connectors
for RX23 FDI
Boards

RZ23 or
RZ24 or
RX23

Power
Supply

TZ30 or
RZ23 or
RZ24 or
RX23

Lower Drive
Mounting Panel

Upper Drive
Mounting Panel

RZ23 or
RZ24

Upper Drive Panel Power
Lower Drive Panel Power
Data
MLO-006318

2–4 DHT80 Option Installation Manual

2. Loosen the four captive screws on the upper drive shelf.
Figure 2–4.)

(See

3. Lift the upper drive shelf away from the lower drive shelf and gently
set it aside.
4. Mark and disconnect the SCSI cable( s ) and the power cable connected
to the drives on the lower drive shelf. (See Figure 2–3.)
Figure 2–4: Removing Upper Drive Shelf
Captive
Screws (2)

Upper Drive
Shelf
Captive
Screws (2)

MLO-006319

Installing the DHT80 Option

2–5

5. Loosen the four captive screws and remove the three Phillips screws
and store safely. (See Figure 2–5.)
6. Slide the lower drive shelf toward you and lift it from the unit.
Figure 2–5: Removing Lower Drive Shelf
Captive
Screws (2)

Lower
Drive Shelf

Captive
Screws (2)

Phillips
Screws (3)

MLO-006320

2–6 DHT80 Option Installation Manual

2.4 Adding Standoffs and 100-Way Cable
NOTE: If another option was present, go to Section 2.5.
After removing the upper and lower drive shelves, add standoffs to the
lower drive mounting panel as follows:
1. Through the bottom of the lower drive mounting panel, snap in five
standoffs shown in Figure 2–6. The lip of each standoff is to face the
outside edge of the DHT80 module.
Figure 2–6: Inserting Five Standoffs on Lower Drive Shelf

Standoffs

Standoff Lip

Insert
Standoffs(5)
Through
Bottom

MLO-006321

Installing the DHT80 Option

2–7

2. Connect the 100-way ribbon cable (17–02295–02) to the system board,
as shown in Figure 2–7. Make sure the cable connector key is fitted to
the slot on the system board connector.
3. Push until the cable connector locks into place.
CAUTION: Failure to fit the key of the ribbon cable connector into the slot
on the system connector can later cause damage to the components.
Figure 2–7: Connecting 100-Way Connector to System Board

100-Way
Cable

MLO-006322

2–8 DHT80 Option Installation Manual

2.5 Installing the DHT80 Option
Install the DHT80 option on the lower drive shelf as follows:
1. Snap the DHT80 module onto the five standoffs and secure with the
three captive screws mounted on the DHT80 option. (See Figure 2–8.)
Figure 2–8: Snapping DHT80 into Place

MLO-007105

Installing the DHT80 Option

2–9

2. Reinstall the lower drive shelf. Push back on the shelf and align the
screws. Tighten the screws after all are started.
3. Fit the end of the modem cable (17–02908–01, with the 25-pin D-sub
connector) through the cutout on the adapter plate (17–41591–01). Use
the two hex screws (90–08451–12) to hold the cable onto the adapter
plate. (See Figure 2–9.)
Figure 2–9: Attaching Modem Cable to Adapter Plate
25-Way cable
Adapter Plate

line weight added separately
on layer 9 = .012

MLO-007104

4. Mount the modem connector assembly to the rear of the system using
the screws saved from removing the blank plate. The adapter plate
is then mounted where the upper blank plate used to be. (See
Figure 2–10.)

2–10 DHT80 Option Installation Manual

5. Connect the other end of the modem assembly cable to the small keyed
connector on the DHT80 module. See Figure 2–10.
6. Insert the other end of the 100-way cable in the DHT80, as shown in
Figure 2–10, and push until it locks in place.
Figure 2–10: Connecting the Modem Cable and Port

Phillips Screws (2)
100-Way
Cable

25-Way
Cable

MLO-007106

Installing the DHT80 Option

2–11

2.6 Reconnecting Cables, Drive Shelves, and
Tightening Cover
1. Reconnect the SCSI cables and power cable connected to the drives on
the lower drive shelf, following the markings you made on the cables
earlier. Reverse steps 5 and 6 in Section 2.3.
2. Slide the upper drive shelf over the lower drive shelf, and tighten the
four captive screws.
3. Reconnect the SCSI cables and power cable connected to the drives on
the upper drive shelf, following the markings you made on the cables
earlier.
4. Slide the DECsystem 5100 cover back on, and tighten the two Phillips
cover screws.
5. Reconnect all cables to the DECsystem 5100, following the markings
you made on the cables earlier.
6. If necessary, add the MMJ labels shown in Figure 1–2.

2.7 Replacing the DHT80 Option
If after testing the option, or when replacing the option for any reason,
you need to take the DHT80 option out of the system, use the following
procedure:
1. Follow the steps in Section 2.1.
2. Disconnect the two connectors to the DHT80 module that is being
removed.
3. Loosen and remove the three Phillips screws holding the module to the
lower drive tray.
4. Remove the DHT80 module. The standoffs remain in place to be used
again.
5. Follow the steps in Section 2.5 to install the replacement module. Step
2 is unnecessary since the lower drive shelf is already in place.
6. Follow steps 4 and 5 in Section 2.6.

2–12 DHT80 Option Installation Manual

Chapter 3

Testing the DHT80 Option
NOTE: Troubleshooting and module replacement is to be done only by
Digital service representatives or by qualified self-maintenance personnel.
To ready the system for booting, you must turn it on, connect the
DECsystem 5100 to a terminal via port 3. At power-up, the terminal
displays a countdown and begins the self-test.

3.1 Diagnose by Checking the iooption
Enter the command printenv to see if the iooption is equal to 1. If the
iooption does not=1, enter
>>setenv iooption 1

Until this is done, the DHT80 will not be recognized by the system. Once
done, the system will remember the setting. If the system module is
changed, this step must be done again. The following example shows the
iooption equal to 1:
>>printenv
bootp=
bootmode=*
console=0
scsiid=7
baud0=9600
systype=0x820c0401
inetaddr=0
baud=9600
baud2=9600
baud3=9600
bitmap=0xa07ff800
bitmapen=0x200
iooption=0x1

Testing the DHT80 Option

3–1

3.2 Verifying That the System Sees the DHT80
Enter conf -f to verify that the system can see the DHT80 and other
installed devices. The following is an example of the output, showing that
the system recognizes the DHT80:
>>conf -f
hardware: revision 1
firmware: revision 4
cpu: revision 2.32
fpu: revision 3.32
security switch: secure mode
password: clear
eeprom: valid
ethernet hardre address: 08-00-2b-19-28-1d
option board: DHT80 - Async Comm, 8 ports
memory: total size
8MBs
bank0
4 MB
SIMMS size
8MBs
0 bad pages
scsi peripherals
unit type
product
removable/fixed
0
3
5

disk
disk
tape

RZ24
RZ24
TZK10

capacity
200 MBs
200 MBs

If the system does not recognize the DHT80 option, perform Section 3.1
again.

3.3 Testing the DHT80 Internal Mode
Test the DHT80 internal mode by entering the command
>>test -v 0x5

All the lines in the system will be tested. The first four lines are on the
system module.

3–2 DHT80 Option Installation Manual

3.4 Testing the DHT80 External Mode
Test the DHT80 external mode by using the H3103 (12–25083–01)
loopbacks on the MMJ ports and the RS232 loopbacks (H3248) for the
modem port. In testing the DHT80, you will also see the system ports
on the list. Use the following table to determine the MMJ line number.
Refer to Table 3–1 and the example that follows to select and test the
asynchronous lines. When you have successfully tested all the DHT80 lines,
the system can be handed over to the customer.

Table 3–1: MMJ Connectors
Port Name
on Bezel

Line Number

Module

MMJ 1

System

MMJ 2

System

MMJ 3

System

Modem

System

MMJ 4

DHT80

MMJ 5

DHT80

MMJ 6

DHT80

MMJ 7

DHT80

MMJ 8

DHT80

MMJ 9

DHT80

MMJ 10

DHT80

B2 Modem

DHT80

Testing the DHT80 Option

3–3

For example, to test MMJ 8 (line 7) in external mode, enter
>>test -v 0x5 1 7

The 1 selects external mode, the 7 selects the line number.
Remember to install a loopback on the MMJ number corresponding to the
line number that you select (MMJ 8 in this example). The following shows
a successful completion of the external tests on line 7 (MMJ 8).
>>test -v 0x5 1 7
-005-03 dz ln 07 ext rx/tx lpback tst
-005-03 dz ln 07 ext sngle ln silo tst
-005-03 dz ln 07 ext silo ovrflow tst
-005-03 dz ln 07 ext mul line silo tst
-005-03 dz ln 07 ext silo alarm tst
>>

3–4 DHT80 Option Installation Manual

Appendix A

FRUs and Cables for the DHT80 Option
Appendix A lists the the field-replaceable units of the DHT80 and their part
numbers.

Table A–1: FRUs and Cables for the DHT80 Option
Part

Part Number

DHT80 option

54–20428–01

100-way cable

17–02295–02

Upper blank plate

74–38986–01

Lower blank plate

74–41590–01

Modem cable

17–02908–01

Adapter plate

17–41591–01

Hex screws

90–08451–12

H3103 loopback

12–25083–01

RS–232 loopback

00–H3248–00

Modem cable

BC22F-xx

Null modem, 6-wire

BC22-D-xx

Null modem, 10-wire

BC17D-xx

Label, MMJs 4, 5, 6, 7

36–33715–03

Label, MMJs 8, 9, 10

36–33716–01

FRUs and Cables for the DHT80 Option

A–1