HP 27140A Quick user guide

HP 9000 Series 500 Computer Systems
HP27140A
Asynchronous 6-Channel Multiplexer
(with Modem Control)
Hewlett-Packard Company
Roseville Networks Division
8000 Foothills Boulevard
Roseville, California 95678
Hardware Reference Manual
Fli;- HEWLETT
a:~ PACKARD
Card Assembly: 27140-60001
Update 1 (October1988)
Manual Part Number: 27140-90007
E0688
Printed in U.S.A.
June 1988

2
Notice
The information contained in this document is subject to change without
notice.
HEWLETI-PACKARD COMPANYMAKES
NO WARRAN'IY OF ANY
KIND
WITH REGARD TO THIS MATERIAL, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANT-
ABILI'IYAND FITNESS
FOR A PARTICULAR PURPOSE. Hewlett-
Packard shall not be liable for errors contained herein or for incidental or
consequential damages in connectionwith the furnishing, performance, or
use of this material.
Hewlett-Packardassumes
no responsibility for the use or reliability of its
software
on equipment that is not furnished by Hewlett-Packard.
This document contains proprietaryinformation, which is
protected by
copyright. All rights
are reserved. No part of this document may be
photocopied, reproduced, or translated into another languagewithout the
prior written consent of Hewlett-Packard.
Copyright © 1988 by HEWLETI-PACKARD COMPANY

Printing History
Neweditions are complete revisions of the manual. Update packages,
which are issued between editions, contain additional and replacement
pages to be merged into the manual bythe customer. The dates on the
title page change onlywhen a new edition or a new update is published.
No information is incorporated into a reprinting unless it appears as a
prior update; the edition does not change when an update is incorporated.
A software code may be printed before the date; this indicates the version
level of the software product at the time the manual or update was issued.
Many product updates and fIXes do not require manual changes and, con-
versely, manual corrections may be done without accompanying product
changes. Therefore, do not expect a one-to-one correspondencebetween
product updates and manual updates.
Edition 1 .......................... June 1988
Update 1 ...................... October 1988
3

General
Safety Symbols
''1U,jut,)
ICaution I
4
Safety Considerations
This product and related documentation must be reviewed for familiariza-
tion with safety markings before operation.
Instruction manual symbol:
the product will be marked with this symbol
when it is necessaryfor
the user to refer to the instruction manual in order
to protect the product against damage.
Indicates hazardous voltages.
Indicates earth (ground) terminal. This symbol is sometimes
used in the
manual to indicate circuit common connected to a grounded chassis.
Thewarning sign denotes a
hazard. It calls attention to a procedure,
practice,or
the like,which, if not correctly performed or adhered to,
could
result in injury. Do not proceed beyond a warning sign until the in-
dicated conditions
are fully understood and met.
The caution sign denotes a hazard. It calls attention to an operating pro-
cedure, practice, or the like, which, if not correctlyperformed or adhered
to, could result in damage to or destruction of part or all of the product.
Do not proceed beyond a caution sign until the indicated conditions are
fully understood and met.

Servicing
General
'1i"'H,[e)
ICautionI
Anyservicing, adjustment, maintenance, or repair of this product must
be performed only by qualified personnel.
SAFE'lY EARm GROUND -The computer on which this product is
installedis a safetyclass I product and is providedwith a protective
earthing terminal. An un interruptible safety ground must be provided
from the main source to the product input wiring terminals, powercord,
or supplied power cord set. Whenever it is likely that the protection has
been impaired, the product must be made inoperative and must be
secured
against anyunintended operation.
STATIC SENSmVE DEVICES
When any two materials make contact, their surfaces are crushed on the
atomiclevel
and electrons pass back and forth between the objects. On
separation, onesurface comes away with excess electrons (negatively
charged) while the other
is electron deficient (positively charged). The
level of charge that is developed depends on the type of material. In-
sulators can easilybuild
up charges inexcess of 20,000 volts. A person
working
at a bench or walking across a floor canbuild up a charge of
manythousands of volts. The amount of staticvoltage developed depends
on the rate of generation of the charge and the capacitance of the body
holding thecharge.
If the discharge happens to go throUgh a semiconduc-
tor device and the transient current pulse is not effectively diverted by
protectioncircuitry, the resulting currentflow through the device
can raise
the temperature
of internaljunctions to their melting points .. MOS struc-
tures are
also susceptible to dieletric damage due to high fields.
The resulting damage can range from complete destruction to latent degrada-
tion. Small geometry semiconductor devices are especiallysusceptible to
damage bystatic discharge.
The MUX card is shippedina transparent static shieldingbag. The card
should be keptinthis bag at all times until it is installedin the system.
Save this bagfor storing or transporting the card. When installing the
card inthe system, do not touch any components. Hold the card onlyby
its edges
or extractor levers.
5

6
Preface
This manual describes the HP 27140A Asynchronous 6-ChannelMulti-
plexer Interface Card with ModemControl. This multiplexer is used in
HP 9000 Series500 computer systems.
The multiplexer accesses up to six remote or local terminals conforming to
EIA specifications RS-232-C or ccrrrrecommendations V.24 and V.28.
These protocols are designed specificallyfor use with modems to transmit
data over telephone networks worldwide. (CCITI V.24is the signal
naming and specificationrecommendation, and CCITI V.28 is concerned
with the electrical characteristics of those signals.)
To ensure proper installation and operation, use this manualalongwith
the instructions found inthe computersystem manuals.

Table of Contents
1 General Information
Description ................................ 1 - 1
Specifications
........... . . . . . . . . . . . . . . . . . . .. 1 - 2
Features
............................... 1- 2
FunctionalSpecifications . . . . . . . . . . . . . . . . . . . .
.. 1 - 2
Capacity . . . . . . . . . . . . . . . . . . . . . . . . . . .
.. 1 - 2
Communications
........................ 1 - 3
EditFunctions
.. . . . . . . . . . . . . . . . . . . . . . . . . .. 1 - 3
Electrical
and PhysicalSpecifications .. . . . . . . . . . . . .. 1 - 4
Direct CurrentRequirements . . . . . . . . . . . . . . .
.. 1- 4
Physical Dimensions
...................... 1 - 4
Environmental Specifications
................... 1 - 4
Firmware . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.. 1 - 4
EquipmentSupplied
.... . . . . . . . . . . . . . . . . . . . . . .. 1 - 4
Options andAdditional Equipment . . . . . . . . . . . . . .
.. 1 - 5
Suggested Cables for Usewith
Terminals. . . . . . . . . . . .. 1- 5
Suggested Cable for Modem Installations . . . . . . . . . . .
.. 1 - 5
RS-232-C Junction Panel
... . . . . . . . . . . . . . . . . . .. 1- 5
DocumentationRequiredfor Installation
............... 1 - 6
ProductIdentification
.....................•..... 1 - 6
SupportStrategy ............................. 1- 7
Cable Repair . . . . . . . . . . . . . . . . . . . . . . . . . . .
.. 1 - 7
User Responsibility ......................... 1-7
System Console . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 1- 7
Buffer Capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.. 1 - 8
2 InstallationI Configuration
Site Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 2 - 1
Unpacking
and Examining the PCA ... ~ . . . . . . . . . . . . .. 2 - 2
Storage ...•............................ 2 - 2
Checking Power Requirements ..... . . . . . . . . . . . . . . .. 2 - 2
Power Availability
Formula. . . . . . . . . . . . . . . . . . . .. 2 - 2
Inserting the
Card ............................ 2 - 3
Removing the
Card . . . . . . . . . . . . . . . . . . . . . . . . . . .. 2 - 3
Testing
the Unit. . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 2 - 4
Attaching the Cables . • . . . . . . . . . . . . . . . . . . . . . . .
.. 2 - 4
MUX-to-Junction Panel Cable . . . . . . . . . . . . . . • . .
.. 2 - 4 .
RS-232-C Cables . . . . .. . . . . . • . . . . . . . . . . . . . .. 2 - 6
ConftgUl'ation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 2 - 6
7

8
3 FunctionalDescription
MainSub-assemblies . • . . . . . . . . . . . . . . . . . . . . . . . .. 3 - 1
PrintedCircuitAssembly . . . . . . . . . . . . . . . . . . . . .. 3 - 1
Multiplexer-to-Panel Cables •.........•......... 3 - 1
RS-232-C JunctionPanel
............. . . . . . . . .. 3- 2
DeviceTypes Accepted
.................... 3 - 2
Variations from RS-232-C . . . . . . . . . . . . . . . . .
.. 3 - 2
Organization
...•........................... 3- 3
The Circuit Planes . . • . . . . . . . . . . . . . . . . . . . . . .. 3 - 3
Backplane Interface Circuits ...............•. 3 - 3
Midplane Circuits ....................... 3 - 3
FrontplaneCircuits • • • . . . . . . . . . . . • . . . . . . .. 3 - 3
FunctionalBlocks .....••................... 3 - 4
MemoryInterface Controller .....••.......•.. 3 - 4
ClockDriver ...•............•...•..•.. 3 - 5
Microprocessor . • • . . . . . . . . . . . . • . . . • . • • .. 3 - 5
Z-SO to SCCCommand Interface . . . . . . . . . . . . . .. 3 - 5
EPROM . . . . . • • . . . . . . . . • . . . . . . . . . . . .. 3 - 5
RAM •.•..•.•••.••.••.....•••.•..... 3-5
SerialCommunications Controllers . . . . . . . . . . . . .. 3- 6
Line Drivers and Receivers .................. 3- 6
4 Troubleshooting
Description of SelfTest .•....................... 4 - 1
Results ................................ 4 - 1
In Case of Failure ............0.............. 4 - 2
Troubleshooting
............................. 4 - 2
5 Component Parts
Component Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 5 - 1
OrderingInformation
.......................... 5 - 2
6 Reference
OtherReferences . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 6 - 1
Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.. 6 - 2
SafetyGround . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.. 6 - 6
SupportedModems
........................... 6 - 6
Connecting Cables (RS-232-C)
..................... 6 - 7
7 Diagrams
Index

1
Description
General Information
This manual describes the the HP 27140A Asynchronous 6-Channel Multi- .
plexer (MUX) Interface. We use the terms "multiplexer", "MUX", "HP
27140A", and its full name interchangeably to describe the entire product.
The terms "board", "card" and "PCA" designate the printedcircuit assemb-
ly as distinct from the entire product.
The HP 27140A accesses any ofthe computers using the Hewlett-Packard
ChannelInput/Output backplane standard. (Channel110 is a Hewlett-
Packardstandard derming the electrical and physical characteristics for
an Input/Output system.) The multiplexer supportsRS-232-C and CCITT
V.24 andV.28 communications standards.
The factory settingfor theinformation transmission rate is 9600 baud.
The MUX is also programmable to process ratesfrom 50 to 19200 baud.
SeeChapter2, "Installation and Configuration", for the information
needed to use the six communications ports.
This multiplexer provides for Input and Output (110) through multiple
modems from remote locationsvia telephone lines. This product has the
appropriate control lines for connection to anymodemwhich adheres to
RS-232-C or CCITTV.24 and V.28. There are no modems includedwith
this multiplexer. The MUX also communicateswith local, direct-connect
devices, and supports any mix of six peripheralswhile using only one card
slot inthe computer backplane.
Your local telephone company or your long distance carrier will beable to
install conditioned telephone lines if your modems or applications require
them.
General Information 1-1

Specifications
Features
Functional
Specifications
Capacity
1-2 General Information
Six full duplexasynchronous serial I/O ports with 10 wire modem control
capability (satisfies European licensing requirements).
EIARS-132-C and
CCITf V.28 compatibility.
Full duplex modem operation
only.
Support for use as a local system console on port o.
Programmable data rates for each channel.
Programmable number ofstop bits:
1, 1.5, 2.
Programmable parity:. odd, even, none.
Programmable charactersize:
5, 6, 7, or8 databits.
Parity, overrun, framing errorcheck detects transmission faults.
Yumware based selftest helps assure cardintegrity.
Programmable device XON/XOFF handshaking topace MUXoutput
data transmission.
On-boardbuffering withDMA capability to send/receive data for multiple
ports in a single transfer.
Channels:
Six channels -full duplex.
Buffering: Oncardbuffering with DMA capabilityto
send/receive for multiple ports in a single
transfer to reduce host CPU interrupts
and increase throughput.
Transmit Buffer
Size: 255 bytes perport.
Receive Buffer Size: Effective lKbyte buffer allocated
dynamically over all
six ports.