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.
Communications
Edit Functions
Interface
Level:
nata
Rates:
Throughput:
Modem Support:
RS-232-C
and CCI'IT
V.2B.
Defaults to
9600;
software programmable
to any of
16
transfer rates:
SO,
75,
110,
134.5,150,300,600,900,1200,1800,2400,
3600,
4800,
7200,
9600,
and
19,200
baud.
Supports
six
interactive terminal users
running character mode at
19,200
baud.
Other RS-232-C applications receiving
and sending simultaneously shouldberun
at
9600
baud orslower. (Refer to Table
1-1
for details on transmission rates.)
Originate mode.
Auto-answer mode.
Modem connection timer.
Lost receiver readytimer.
No-activity timer.
Host control ofevery card output modem
line.
Communications Mode: Asynchronous, bit serial.
BreakDetection: Break conditions are recognized by the
card and cause interrupts to the host. The
MUX can
also
generate break conditions
as
they are needed. A break
is
a "space"
condition for
two
consecutive character
times.
Optional Handshaking: All handshaking
is
optional and
programmable. The protocol characters
are also programmable. Device controlled
XON/XOFF
is
performed at the card
level.
The MUX passes edit functions (i.e., backspace, character delete, etc.) to
the host. They are then managed by the host operatingsystem.
General Information
1-3
Electrical
and
Physical
Specifications
Direct Current
Requirements
Physical Dimensions
Environmental
Specifications
Firmware
Equipment
Supplied
1-4
General Information
Typical + Two a
Voltage
Current
(Standard
Deviation)
+5
1.380A
+12
0.084
A
-12
0.125
A
Length:
17.72cm
Width:
17.70cm
1hickness:
2.95mm
Weight
(card
only):
270
grams
2.298 A
0.159
A
0.150
A
(7 in)
(7 in)
(0.12 in)
(9.5 oz)
The
MUX
card
is
sensitive
to
humidity
and
temperature.
The
card
operates
between0
and
SOOC
and
should
be
stored
onlywhere
the
temperature
will
range
from
-40
to
7SOC.
Humidity(@ 4<rC non-
condensing) should
be
maintained
between
5%
and
95%.
The
PCA
includes
one
EPROM
(Erasable, Programmable,
Read
Only
Memory) chip.
The
EPROM
contains
the
on
board
self
test
and
download monitor programs. Selftestis described in
Chapter
4,
"Troubleshooting".;
The
download monitor directs
the
downloading
of
control codesfor
board
operation
and
insures
that
they
are
correct
and
stored
properly.
The
EPROM
also provides enough
on
board
intelligence
to
use port0 for communicationswith a terminal. This feature is typically
used
for
the
system controlconsole for
the
initial system boot-up.
The
HP
27140A is designed for
HP
9000 Series
500
computers:
Description
Multiplexer
PCA
RS-232-C Junction
Panel
Cable, PCA-to-Panel, 1
metre
This Reference
Manual
Part
Number
27140-60001
28659-60005
28659-63002
27140-90007
Options
and
Additional Equipment
Suggested Cables for
Use with Terminals
Suggested Cable for
Modem Installations
RS-232-C Junction
Panel
INoteI
The
following
items are
also
available through HPSales and Support Of-
fices
if
you
did not order them
with
the
system.
The 10-metre extension
cable connects to the standard cable for greater
flexibility
in installation.
Use ofthe Test Hood
is
described in Chapter
4,
"Troubleshooting".
27140A
Option #001:
Option #019:
Option #540:
Option #550:
27140-60003
Extension cable
10
metre, pIn
28659-63004
19
inchRack Mounting Bracket Kit, pIn
5061-4962
Mounting Bracket Kit for
9040A
Systems,
pIn
5061-4963
Mounting Bracket
Kit
for
92211R
Cabinet,
pIn
5001-5280
Test Hood
The
following
cables are designed to connect the MUX RS-232-C Junc-
tion Panel to your terminals:
• HP
13242M
(5
metres)
• HP
13242N
(5
metres)
• HP
13242Y
(5
metres)
• HP922190
(3.8
metres).
The HP922190 cable, 5 metres long, is designed to connect the MUXto
a modem.
The
RS-232-C
JunctionPanel
(28659-60005)
is
a six-portjunctionbox
which provides serial, asynchronous interconnectionsbetween the multi-
plexer card and a modem orterminal device. See Figure
1-1.
This
panel
has
one 62-pin receptacle and
six
25-pin D subminiature female connec-
tors on the front.
This
RS-232-C
Junction Panel
is
considered a field replaceable unit and
should be replaced on failure. Hewlett-Packard does not support user
maintenance of
this
component. Contactyour
HP
Sales and Support
Office for additional information.
Generallnfonnation
1-5
Documentation
Required for
Installation
Product
Identification
1-6
GenerallnformatioD
II
~
Screw
Figure1·1. RS·232-C
Junction
Panel
HP
28659-60005
To
insure
proper
installation
of
the
multiplexer, you shouldstudythis
manual, the computersystem reference manual,
and
the
reference
and
in-
stallationmanuals for all
of
the
peripheralsyou intend
to
attach
to
the
MUX.
The
interface
card
suppliedwith the
HP
27140A
product
is identifiedbya
part
number (27140-60001)
and
a date
code
consisting
of
a letter
and
four
digits (A-2450) printedbelow
the
part
number. This information is
printed
on
a label
affIXed
to
the card.
The
label also has two
other
alphamericfields. Both
are
production sequencenumbers,
and
will
not
affect you. However, your
CE
may
need
to
refer
to
them
occcasionally, so
it is a goodidea
to
recordall
of
this information.
The
stickerwilllook like
this:
27140-60001
XX
A-2450
XXXXXX
Above,
"X"
represents any alphanumericcharacter.
Do
not
remove
the
identification label.
If
it is
missing,
service for your
MUX
may.be delayed
while the
board
is identified.
Support Strategy
Cable Repair
User Responsibility
System Console
The
HP
27140A Multiplexer Interface
card
is a FieldReplaceable
Unit
(FRU).
The
electronic components
and
circuitry
on
the
card
are
not
repairable except
under
factory conditions. Exchanging
boards
also sig-
nificantly reduces downtime
compared
to
removing, repairing
and
replac-
ing
the
original card. Whenever
the
PCA
is replaced, remove
the
EPROM
and
retain it for insertion in
the
replacement card, as
the
new
card
will not have
an
EPROM
on
it. Insure
that
precautions
are
taken
to
protect the
EPROM
from static discharge.
Component level repair is not
supported
byHewlett-Packard.
Users
who
attempt repair
at
this level may invalidate their warranties.
The
sole ex-
ception
to
this guideline is the
EPROM.
Your
HP
Customer Engineer
will remove it, have it tested
and
replace it if necessary.
The
multiplexer is designed with
an
extremely compact cable connector.
Because
of
the tolerances for
the
cable connector it is impossible
to
repair
or
modify the
board
connector
end
of
the
PCA
-to-Panel cable.
Any
failure ofthe cable
at
the boardconnector end requires replacement
of
the cable assembly.
The
junctionpanel
end
of
the cable was fabricated using a conventional
connector. Tables in Chapter
6,
"Reference", list
the
pin assignments for
this cable.
There
are
no physical adjustments
to
make
on
this
card
nor
is any special
preventive maintenance required. You maywant
to
clean
the
computer
card
cage occasionally.
If
so, your computer manualwill have instructions
on this subject.
In
case
of
apparent
card
failure,
run
the
selftest described
in Chapter
4.
If
the
board
fails, call your
HP
Customer Engineer.
If
the system console is attached
to
port
0
of
the
RS-232-C
Junction
Panel,
the resident fIrmware
on
this
card
will transmit
to
and
receive from
the
console at 9600 baud, using 8 bitASCII characters with
no
paritycheck
bit.
There
will
be
one
stopbit.
General Information
1-7
Buffer Capacity
INoteI
1-8
General Information
The
HP
27140A uses a 4Kbyte buffer to temporarilystore
data
to
be
sent
to the host computer. Because
of
the distinctive system
used
to identify
each character received, this capacityprovides actual character storage
equal to lKbyte. Buffer spaceis dynamically allocated
to
the
six ports as
they require it. Thus, no one port has specific buffer address space dedi-
cated to it. This buffer capacity limits the throughput
of
the
MUX.
Table
1-1 lists four possible combinations
of
baud
rates for the
HP
27140A.
Table 1-1. ButTer CapacityBaud Rate Limits
Port Baud Rate
1 2 3 4
0 19200 19200 19200 9600*
1 4800* 19200 19200 9600*
2 4800* 19200 2400* 9600*
3 4800* unused 2400* 9600*
4 4800* unused 2400* 9600*
5 4800* unused 2400* 9600*
*Slower rates may
be
used.
All
of
these speeds assume full duplex operation
and
near
100% utiliza-
tion
of
channel capacity. Operation at higher speeds
than
noted
may
result in
DATA
OVERRUN
errors.
When all six terminals
are
being usedby people in interactive programs, it
is unlikely that the users could overload the buffer, since human beings
do
not enter data rapidly enough to use the potential
of
19200 baud.
In
this
case, all six ports could
be
programmed to 19200.
Update 1 (October
1988)
2
I
Caution
I
Site Preparation
Installation / Configuration
Please read all
of
the sections
of
this chapterwhich apply
to
your com-
puterbefore proceedingwith the installation
of
your
HP
27140A Multi-
plexer.
Installing this
PCA
involves the following steps:
1.
Unpacking
and
examining the
card
(temporarystorage
is
also
discussed).
2. Insertingthe cardinto the computer
card
cage.
3. Testing the unit.
4.
AttachingMUX-to-JunctionPanel, Modem,
and
RS-232-C direct
connect cables.
After installation, the card
is
configuredbyprogrammaticinstructions.
Many
of
the components
of
the
HP
27140A
are
susceptibl~
to
destruction
or
degradationbyelectrostatic discharge. See
the
safetyconsiderations in
thefront
of
this manaul.
To
handle this card, use only
the
edges
and
ex-
tractor levers
to
avoid damage
to
components.
/~
There
is
nosite preparation required for this product other than
proper
installation
of
the host computer.
Using the
MUX
will
requirethat several cables
be
attached to
the
RS-232-
C Junction Panel. Consideration must
be
given
to
locating
the
RS-232-C
Junction Panelmountingbracket so that these cables present
no
problems
to
traffic
or
maintenance
of
the computer.
The
RS-232-C standardlimits
the
length
of
cable from the carditself
to
any terminal device
to
a total
of
15
metres
(SO
feet).
InstallationI Configuration 2
..
1
Unpacking and
Examining the
peA
Storage
Checking Power
Requirements
PowerAvailability
Formula
2-2
InstallationI Configuration .
Remove
the
PCA
from its protective envelope
and
place
it
on
anti-static
materialina cleanworkspace.
Inspect
the
card
itselffor
damage
or
miss-
ingparts,
and
verify
the
part
number. Also,
check
the
other
subassemblies
for damage.
H you
store
the
card
for anyreason,
place
it
in
an
electrically
and
mechani-
callysafe container.
The
safest
place
for
the
PCA
is in
the
computer
card
cage.
If
youmust
store
the
peA
outside
of
the
computer,
use
the
original
packagingmaterial
or
have
the
card
packed
by
a commercialfirm.
You
must
protect
this
PCA
from staticelectricity
and
impact.
Place
the
pack-
age
containing
the
card
upright (like a
book
on
a shelf),
to
avoid crushing.
This
card
draws its electrical
requirements
from
the
host
computer.
You
mustverify
that
the
computer
can
accommodate
this additional
power
load.
Refer
to
Table
2-1 for
the
power
requirements
of
the
MUX.
Table2-1. Power
Requirements
for
the
UP
27140A
Power
Voltage
Mean
level
2alevel
+5
6.90W
12.06W
+12
1.01W 1.90W
-12 1.62W I.SOW
Mean
power
required
can
be
thought
of
as
the
nominal
power
require-
ment
of
the
card.
For
the
purposes
of
calculating
probable
power
usage,
use
the
mean
power
level figures plus
20%
as
the
maximum
power
require-
ment.
Check
the
computer
system
manual
for
the
total
power
supplied
to
the
backplane
at
each
voltage level.
After
summing
the
power
fIgUl'es (in
watts) for
the
other
cards
in
the
computer,
subtract
this
total
from
the
wattage available. This difference
is
the
power
available for
use
by
the
HP
27140A.
Power
Available
Power
Supplied
for
the
MUX
= by
the
Host
- L {
Power
Loads
Of}
all
other
cards
There
must
be
more
power
available
to
the
MUX
than
the
requirement
at
each
voltage level.
Power
Available Power
Required
for
the
MUX
>
by
the
MUX
Inserting the
Card
ti''''''',)
Removing the
Card
I
Note
I
If
the power available
is
too
low
to meet the requirements ofthe MUX at
eachvoltage
level,
you
must
augment the computer power supply, or
remove another boardbefore installing the card. Contact your
HP
Sales
andSupport Office for details.
Refer to the
System
Installation
and
Configuration
Guide included with
your
system
for the proper placement and positioning ofthe card.
Before attempting
to
install this
(or
any) peA,follow thecomputer"shut .
down"
procedure
and
TURN
OFF
the computerpower supply. Failureto
disconnect the
current
could result
in
an
electrical shock,
and
it
may
damage boththecomputer
and
the card. Any
resultant
damagewill
not
becovered bywarranty.
The
27140A
MUX card uses friction at the backplane contacts to hold the
card in place. Hold the card
firmly
by
the extractor levers andgently push
it into the track-like guides ofthe slot. Once the cardtouches the back-
plane connectors (you'll notice the resistance), press
it
firmly
into the
backplane. Asthe cardreaches its limit oftravel, the free ends ofthe
ex-
tractor levers willstart to
fold
down
against the card. Press on them until
the card
is
fully
seated
in
the backplane.
Toremove the card, grasp the free ends ofthe extractor levers, and pivot
them toward
you
(away
from
the cardcage). This willforce the card out
slightly
from
the connectors at the backplane. Continue pulling, butbe
careful to pull both levers
evenly
to
avoid
jamming the PCA orbreaking
its components. Use the
same
caution against staticbuild-up and dis-
charge discussed in the paragraph on unpacking the card
while
handling
the boardonce
you
have
removed it.
Repair or replacement ofother electroniccomponents could invalidate
your warranty.
InstallationI Configuration
2-3
Testing the Unit
Attaching the
Cables
MUX-to-Junction
Panel
Cable
24
InstallationI Configuration
Once
you have correctlyinstalled
the
PCA
you should test it
to
verify
proper
operation
of
the
MUX.
While selftest may
be
run
with
or
without
the connectingcable attached
to
the board,you should initially
run
the
testbefore attaching it. Selftest is executed automatically
on
power up.
The
informationyou
need
to
interpretthe results
of
selftest
are
found in
Chapte
..
4. Basically,
if
the
LED
on
the
card
stays offafter 45 seconds, the
card
is working correctly.
The
cables you
will
use
are
the MUX-to-JunctionPanel cable
and
the
RS-
232-C cables attached
to
your peripheral devices. Before attachingthe
peripheralcables
to
thejunction
pane~
check themanuals for any specific
cablingrequirements.
The
MUX-to-Junction cable is a 62-conductor cable with a proprietary
female connectionwhich fits the
card
edge connector.
This
fitting is black
plasticwith a metal ground
striponthe
back.
The
RFI
groundingclip
(grommet) approxinlately two inches (5 em) from
the
connection
will
help
you identify it. Press
this
connection fumly onto the
PCA
mounted con-
nectorwith the cable exiting the connector
on
the bottom. Pressthe grom-
met fumly into the slot
on
the cable groundingbusbelowthe
card
cage.
If
yoUr
computeris equippedwith a retaining springbelow the grounding
bus, ensure thegrommet
is
fully seated in the spring. These steps
are
criti-
cal to reducing Radio FrequencyInterference from
an
ungrounded cable.
Since
this
cable
is
onemetrelong Gust less
than
40 inches), you should
mount the RS-232-C mountingbracket
on
the computerbody,
or
very
near
it.
The
10-metre optional extension cable
will
allowyou
to
place the
panelin a more convenient location, should this
be
necessary.
If
you have
the extension cable, remember
to
include its length in all
card
to
device
"cable length totals. FigUres 2-1 through 2-3 show thevarious mounting
bracket options available. Once the cable
end
is outside the computer,
and
the b,acketwith theRS-232-CJunction Panel is mounted, the62-pin
female connector at the
free"
end
of
the cable is pressedinto the male con-
nector onthe panelfront. Using the mounting bolts provided, secure the
connector
to
the receptacle.
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