HP 98628A User manual

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HP Computer Systems
HP 98628N98691A
Datacomm Interface Installation
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Fho- HEWLETT
a:~ PACKARD
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F/iOW HEWLETT
a:~ PACKARD
warranty Statement
Hewlett-Packard products are warranted against defects in
materials and workmanship. For Hewlett-Packard Desktop
Computer Division products sold
in the U.S.A. and Canada,
this warranty applies for ninety (90) days from the date of
delivery.* Hewlett-Packard will, at its option, repair or replace
equipment which proves to be defective during the warranty
period. This warranty includes labor, parts, and surface
travel costs,
if any. Equipment returned to Hewlett-Packard
for
repair must be shipped freight prepaid. Repairs
necessitated by misuse of the equipment. or by hardware,
software, or interfacing not provided by Hewlett-Packard are
not covered by this warranty.
HP warrants that its software and firmware designated by HP
for use with a CPU will execute its programming instructions
when properly installed
on that CPU. HP does not warrant
that the operation of the
CPU, software, or firmware will be
uninterrupted or error free.
NO OTHER WARRANTY IS EXPRESSED OR IMPLIED,
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
A PARTICULAR PURPOSE. HEWLETT-PACKARD SHALL
NOT
BE LIABLE FOR CONSEQUENTIAL DAMAGES.
*For other countries, contact your local Sales and Service
Office to determine warranty terms.

HP 98628A198691A
Datacomm Interface Installation
for HP Series 200 Computers
Manual Part No. 98628-90001
© Copyright Hewlett -Packard Company 1982, 1983, 1985
This document refers to proprietary computer software which is protected by
copyright. All rights are reserved. Copying or other reproduction of this program
except for archival purposes is prohibited without the prior written consent of
Hewlett-Packard Company.
Hewlett-Packard
Roseville Networks Division
8000 Foothills Boulevard
Roseville, California 95678

ii
Printing History
New editions of this manual will incorporate all material updated since the previous edition.
Update packages may
be issued between editions and contain replacement and additional
pages to be merged into the manual by the user. Each updated page will be indicated by a
revision
date at the bottom of the page. A vertical bar in the margin indicates the changes on
each page. Note that pages which are rearranged due to changes on a previous page are not
considered revised.
The manual printing date and part number indicate its current edition. The printing date
changes when a new edition is printed. (Minor corrections and updates which are incorporated
at reprint do not cause the date to change.) The manual part number changes when extensive
technical
changes are incorporated.
First Edition .............................................. '" November 1982
Update 1 ........................................................ October 1983
Reprint (incorporating update 1) .......................... October 1983
Update 2 ...................................................... December 1983
Reprint (incorporating update 2) ........................ December 1983
Update 3 ....................................................... February 1985

Table ofContents
Chapter 1: General Information
Introduction . . . . . . . . . . . . . . . . . . .
.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 1
Unpacking
and Inspection ..... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 2
Handling
................................................................... 2
Technical Spcifications
....................................................... 3
Product Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 3
Cable Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.. 4
Specialized Adapters
...................................................... 6
Chapter 2: Interface Configuration
Configuration Switches. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.. 7
Interrupt Level
and Select Code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 8
Remote Switch. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.. 8
Interrupt Level. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.. 8
Interface Select
Code ..................................................... 8
Protocol Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 10
Async/Data Link Protocol Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 10
Async Protocol Default Configuration ....................................... 10
Data Link Protocol Default Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 11
Interface Installation . . . . . . . . . . . .
.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 12
Chapter 3: Interface Cables
RS-232C Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 13
Optional Drivers and Receivers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 13
Option 001 DTE (Male) Cable ............................................. 14
Option 002 DCE (Female) Cable. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 15
Connecting Two Desktop Computers
....................................... 16
Using DCE Cables to Connect to DTE Devices. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 17
RS-449 Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.. 17
Option 003 RS-423 Unbalanced OTE Cable ................................. 17
Test Connectors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.. 19
RS-232C DTE Cable Test Connector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.. 19
RS-232C DCE Cable Test Connector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 19
RS-449 Cable Test Connector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 20
Building Custom Cables ..................................................... 21
Safety Considerations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.. 21
Using Interface Power Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 21
Balanced Versus Unbalanced Connections
.................................. 21
Comparison of Datacomm
Standards. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 23
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Chapter 4: Service Information
Theory of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 25
Z-80A System Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 26
Select Code Recognition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 26
Interrupt System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 27
Interface Reset .......................................................... 27
Shared Memory Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 28
Addressing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 28
Read/Write Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 28
Clock Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 28
Memory Access Select Timing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 29
Memory Cycle Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 29
Hardware Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 31
Shared RAM ........................................................... 32
Default Switches. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 33
Baud Rate Multiplexer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 33
Line Drivers and Receivers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 33
Replacement Parts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 34

Chapter 1
General Information
Introduction
The HP 98628A Data Communications Interface and HP 98691A Programmable Datacomm
Interface are microprocessor-based datacomm interfaces designed for use with HP Series
200
computers. Each interface contains a built-in microprocessor and associated circuits that per-
form
all protocol management and signalling functions for data communications using RS-
232C and RS-449 connections.
The HP 98628A Datacomm Interface supports two protocols:
• Asynchronous (Async) protocol commonly used for timesharing and remote host compu-
ter applications as well as connections to remote terminals.
• HP DSN/Data Link Protocol most commonly used with Data Link network applications
based
around an HP 1000 network host computer.
The HP 98691A Programmable Datacomm Interface
is designed for installing custom protocols
or protocols that are designed
and supported by suppliers other than Hewlett-Packard Com-
pany. This interface
is usually sold through the supplier of the custom protocol firmware.
Several cable options are also available, accommodating most popular interconnections to
standard datacomm links
and modems. They are discussed in Chapter 3.
1

2 General Information
Unpacking and Inspection
If the shipping carton is damaged, ask the carrier's agent to be present when the interface is
unpacked. If the interface is damaged or fails to operate properly, notify the carrier, and the
nearest
HP Sales and Service Office immediately if your interface is an HP 98628. Retain the
shipping carton for the carrier's inspection. The sales
and service office will arrange for the
repair or replacement of your interface without waiting for the claim against the carrier to
be
settled. If your interface is an HP 98691 Programmable Datacomm Interface, contact the
interface supplier for assistance in repair
or replacement.
Handling
Precautionary measures should be taken to protect interface printed circuit assemblies from
static discharge during handling. Each interface
is shipped in a protective anti-static bag which
provides
adequate anti-static protection for the interface as long as it remains inside the bag. It is
good practice to use additional anti-static protection, such as commercially available personnel
grounding straps when servicing or installing interfaces, memory boards, and other assemblies
that may
be sensitive to electro-static discharge.
Avoid touching integrated circuit leads while picking
up or handling the interface. Static dis-
charge through the leads can easily destroy sensitive components. Handle the
board by the
card edges
or metal backplane cover plate. Do NOT handle the interface by its backplane edge
connector. If the edge connector inadvertently gets dirty, it can be cleaned by using a cotton
swab
and isopropyl alcohol.

General Information 3
Technical Specifications
Product Description
The HP 98628A and 98691A are microprocessor-based (Zilog Z-80A or equivalent) data
communications interfaces that fit the 110 backplane of HP Series 200 computers. The interface
includes
on-board read-write (RAM) memory for buffering and other needs. The microp-
rocessor performs protocol
management and other data communication functions, freeing the
mainframe processor for
other tasks. Protocol(s) supported by the interface depend on what
programs are stored in the Program ROM that is plugged into the socket on the interface card.
Physical Description
Size: 135 mm by 170 mm (5.3 in by 6.6 in)
Weight: 310 grams (11 ounces)
Environmental Range
Temperature: O°C to 45°C (32 to 113°F)
Humidity: 0 to 80% non-condensing
Electrical Specifications
98628A power consumption (typical)
+5 V@ 710 rnA
+12 V @ 37 rnA
-12 V @ 60 rnA
The following adapters also obtain power through the HP 98628 interface. Their consumption
should
be added to the interface power consumption when they are used. Typical values are
shown.
HP 13264A Data Link Adapter:
+5 V @30mA
+ 12 V @ 160 rnA
-12 V @ 23 rnA
HP 13266A Current Loop Adapter:
+5 V @ 200 rnA
+ 12 V @ 90 rnA
-12 V @ 80 rnA
HP 13265A Modem:
+5 V @ 100 rnA
+ 12 V @ 45 rnA
-12 V @ 45 rnA
Electrical Interface Compatibility (with appropriate cables)
RS-232C (similar to CCITT V.24/V.28)
RS-449/RS-423 (similar to CCITT V.10)
RS-449/RS-422 (similar to CCITT V.11)1
1 RS-422 cables for this interface are not available from Hewlett-Packard Company

4 General Information
RS-232C Data Rates
Up to 19,200 baud
RS-449 Data Rates
Data rate limitations for RS-449 applications are dependent on cable length, but generally
exceed
the maximum rates available to RS-232C installations. The following charts show the
maximum
speed versus cable length for RS-422 (balanced) and RS-423 (unbalanced) RS-449
installations:
Cable Length
(feet)
10K
4K
1K
400
100
40
10
10K
Not Recommended
Recommended Combinations
100K
1M
10M
RS-422 Modulation Rate Versus Cable Length
Data Rate
(bits/second)