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INSTRUCTIONS FOR
INSTALLATION OF THE DUAL
AND STAND-ALONE
SHORT HAUL MODEMS
(INTO PREVIOUSLY INSTALLED MULTI-LINK SYSTEMS)
TABLE OF CONTENTS
IMPORTANT NOTICES
This document covers the specific actions needed to install dual
and stand-alone short-haul modems into already existing Infinity
Multi-Link systems. The purpose of the short-haul modems (both
the dual and the stand-alone) is to guarantee the reliability of the
communications between the units in the Multi-Link chain and
also between the Multi-Link chain and external devices (such as a
terminal, a printer, or an external telephone modem), where cable
distances are longer than 30 feet in length or subject to excessive
electrical noise. For any information about the Infinity systems
and/or their installation, please refer to the appropriate
installation and programming manuals.
NOTE: Installation where fiber optic phone lines are present may
require additional modifications from your telephone provider.
Contact your provider for more information.
DO NOT attempt to use ANY other short-haul modems, NOT
manufactured by Chamberlain, with Chamberlain short-haul
modems. The use of other short-haul modems with
Chamberlain short-haul modems can result in system
malfunction or failure
Installation of the Dual Short-Haul Modem . . . .3
TESTING THE MODEMS . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Making Connections Between the Multi-Link
Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
APPENDIX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-11
Installation of the Stand-Alone Short-Haul
Modem
Hooking up a terminal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Hooking up a printer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Connecting a printer to the last unit of the multi-link chain . . . . .6
Connecting a printer to the first unit of the multi-link chain . . . .7
Hooking up an external telephone modem . . . . . . . . . . . . . . . . . .8
2
I N S TA L L AT I O N O F T H E D U A L S H O R T- H A U L M O D E M
The dual short-haul modems allow units in the Multi-Link chain to
communicate with each other and with an external device
(e.g., a terminal). These devices are referred to as dual short-haul
modems since they accommodate the two communication ports
in each Multi-Link unit and are necessary for the simultaneous
upstream and downstream communications. Each Multi-Link unit
should have one dual short-haul modem installed in it as
described in the steps below.
DO NOT reconnect the power to ANY of the Multi-Link units or
attached devices until the entire installation has been
completed.
Complete each of the following steps for every unit in the
Multi-Link chain.
1. Disconnect the power from all of the main processor boards in
the Multi-Link system and from any external devices attached
to the Multi-Link chain (Appendix 1).
2. On the back of the dual short-haul modem, remove the paper
backing from each of the tabs.
3. With the tabs facing the inside of the cabinet, place the
modem into the left-hand side of the cabinet with the heat sink
and the power connector (area TB 5) on the bottom and the
LEDs in areas DS1 through DS4 on the top (Figure 1). Press
down firmly on top of each mounting tab to ensure good
adherence to the cabinet.
4. Loosen the screws on the connectors in areas TB 2 and TB 3
on the main processor board and remove all of the wires
currently in these connectors and set aside (the wires will be
needed in a later step).
NOTE: Do not remove these connections if you currently have
additional external devices attached to either one of these blocks.
If these connections become detached, please refer to your
installation manual for re-installation instructions.
5. Take the connector hanging from PORT 1 on the modem and
attach it to the block marked TB 2 (RS 232 Port 1) on the
main processor board (Figure 1).
NOTE: If this unit is the first unit of the chain and there are not
going to be any additional devices attached to this unit, do not
make the connection from PORT 1 on the modem to TB 2 on the
main processor board. However, it is essential that a 5-pin
terminal block with a jumper between "CTS" and "RTS" is placed
in area TB 2 (RS 232 Port 1) on the main processor board. To
make this connection, simply take a 1 1/2" piece of 18 to 24 awg
solid wire and place one end in the "CTS" opening of the terminal
block and the other end of the wire in the "RTS" opening of that
same block and tighten the screws securely. If you are going to
use the jumper connection, do not attach the connector hanging
from "PORT 1" on the modem to any other block within the
system.
6. Take the connector hanging from PORT 2 on the modem and
attach it to the block marked TB 3 (RS 232 Port 2) on the
main processor board (Figure 1).
NOTE: If this unit is the last unit of the chain and there are not
going to be any additional devices (e.g., a terminal) attached to
this unit, do not make the connection from PORT 2 on the
modem to TB 3 on the main processor board. However, it is
essential to place a 5-pin connector with a jumper between "CTS"
and "RTS" in area TB 3 (RS 232 Port 2) on the main processor
board. To make this connection, simply take a 1 1/2" piece of 18
to 24 awg solid wire and place one end in the "CTS" opening of
the terminal block and the other end of the wire in the "RTS"
opening of that same block and tighten the screws securely. If
you are going to use the jumper connection, do not attach the
connector hanging from "PORT 2" on the modem to any other
block within the system.
7. Take the 2-pin connector hanging from area TB 5 on the
modem and attach it to the pins located in area TB 5 on the
main processor board (Figure 1).
Figure 1
Port 2
Port 1
TB 2
TB 3
(RS 232 Port 1) (RS 232 Port 2)
DS1 through DS4
Line 1 Line 2
Port 2
TB 5
+12V
DS5 through DS9
3
Port 1
Dual
Short-Haul
Modem
Grounding
Screw
TB 2
(RS 232 Port 1)
TB 3
(RS 232 Port 2)
TB 5
Main
Processor
Board
M A K I N G C O N N E C T I O N S B E T W E E N T H E M U LT I - L I N K U N I T S
Before making the connections between Multi-Link units, please
review Appendices 1 and 2 at the end of this document. These
appendices show all of the connections and indicators on the dual
short-haul modem and the main processor board. Instructions for
connecting the units are as follows:
1. Take two of the wires from the five conductor wire that was
removed from areas TB 2 and TB 3 and verify that there is
about 1/4" of installation removed from each end of the two
wires. With the remaining three wires, clip off the exposed
wire on each end and make sure these wires will not come in
contact with any area of the Multi-Link system.
2. On unit 1, insert one end of the paired wires into the connector
on the first unit's dual short-haul modem marked "LINE 2"
(Appendix 2) and tighten the screws on the plug securely. A
slight tug on the wires will determine if the wires are attached
to the connector securely.
3. Insert the opposite end of the paired wires into the connector
marked "LINE 1" on the second unit's dual short-haul modem
and tighten the screws securely. It does not matter which wire
is inserted into which opening.
4. Repeat steps 2 through 4 for the rest of the Multi-Link units in
the chain.
4
I N S TA L L AT I O N O F T H E S TA N D - A L O N E S H O R T- H A U L M O D E M
The stand-alone short-haul modem allows an external device with
a cable distance over 30 feet to communicate with the Multi-Link
chain. This modem is connected between the external device and
the appropriate unit in the Multi-Link chain.
HOOKING UP A TERMINAL
To connect the short-haul modem to the first unit of the
Multi-Link system, you will need a 2 conductor, twisted pair,
unshielded 16 to 24 awg telephone wire. Strip about 1/4" of
insulation off of one end of the twisted pair of wires. Insert these
stripped ends into each opening corresponding to the "LINE"
section of the plug located on the back of the stand-alone
short-haul modem and tighten down the screws securely (Figure
2). It does not matter which wire is attached to which opening, as
long as the wires are in the "LINE" plug and not the "12V ac/dc
PWR" plug. Fasten the opposite ends of the twisted pair to the
plug located in the area marked "LINE 1" on the dual short-haul
modem and tighten the screws securely (Appendix 2). Then
attach the wires from the power transformer (provided by
Chamberlain) to the plug in the area marked "12V ac/dc PWR"
(not the "LINE" plug or else severe damage to the modem will
occur)on the back of the stand-alone short-haul modem and
tighten these screws securely. Then plug the power transformer
into a 110/120Vac outlet. Make sure the switch on the front of the
stand-alone short-haul modem is switched to the "PORT 2"
position.
A chain of Infinity systems using Multi-Link firmware can
communicate with a standard ASCII terminal that can emulate a
Televideo 910+ terminal (the terminal available from Chamberlain
is a Wyse 30) via an RS 232 serial port or a short-haul modem.
You may also use a personal computer running "terminal
emulation" software instead of an actual terminal. If you have a
terminal directly connected to the Multi-Link chain, and the
cable distance between the terminal and the first unit of the
chain is under 30 feet, do not remove this connection. If this
connection does become disconnected during the installation,
refer to the installation manual that was included with your
Multi-Link system for instructions on reinstallation. If the distance
of the cable between the terminal and the first unit in the
Multi-Link chain is longer than 30 feet, you need to connect a
stand-alone short-haul modem between the terminal and the first
unit in the chain. Instructions for installation are as follows:
To hook up a terminal or computer to a stand-alone short-haul
modem, you will need a computer cable with "DB25" male
connectors at both ends (or a cable with a "DB25" male connector
at one end and a "DB9" male connector at the other end, if you are
using a computer which only has a 9-pin serial port). Place the
stand-alone short-haul modem within 25 feet of the terminal or
personal computer (it is preferable to be next to the terminal or
personal computer). Attach the proper end of the cable to the
terminal or computer's serial port, and the other end of the cable
to the area marked "RS-232" on the back of the stand-alone
short-haul modem (Figure 2).
NOTE: Unlike "regular" Infinity systems, you may not use a Texas
Instruments Silent 700 series printing terminal to program a
chain of systems using Multi-Link firmware.
Make sure that your terminal is running at the same baud rate as
you set in the original installation of the Multi-Link system. Your
terminal must also be set for a word protocol of 8 data bits, no
parity bits, and 1 stop bit (8 none-1), as well as for full duplex
communications and DTR handshaking. Consult your terminal's
manual to determine how to set this protocol.
Figure 2
Port 1
Line 1
Paired
Wire
to Unit 2
TB 2
RS 232 Port 1
TB 3
RS 232 Port 2
TB 5
Line 2
Stand-Alone
Short-Haul
Modem
Computer Cable
with 2 "DB25"
Connectors
Line
Paired
Wire
Port 2
RS 232
12V ac/dc
Power
Modem
Modem Set
to Port 2
Main Processor Board
First Unit of Multi-Link System
Terminal or Personal Computer
5
HOOKING UP A PRINTER
with your Multi-Link system for instructions on reinstallation. If
the cable distance between the printer and the Multi-Link system
is over 30 feet, you should install a stand-alone short-haul
modem between the printer and the system. As described in the
Multi-Link installation manual, depending on the physical
configuration of your Multi-Link system, you can attach a printer
to either the first or the last unit of the chain. Please refer to the
sections appropriate for your installation.
A chain of Infinity systems using Multi-Link firmware is designed
to communicate with a standard personal computer printer with a
serial interface (the Okidata 184 Turbo is the printer available
from Chamberlain). If you have a printer directly connected to the
Multi-Link chain (to the first or the last unit), and the cable
distance between the printer and the system is under 30 feet, do
not remove this connection. If this connection becomes
disconnected, refer to the installation manual that was included
CONNECTING A PRINTER TO THE LAST UNIT OF THE
MULTI-LINK CHAIN
In most installations, it is more desirable to connect a printer to
the last unit of the Multi-Link chain. To connect a printer to the
last unit of a Multi-Link chain with the use of a stand-alone
short-haul modem, you will need a computer cable with "DB25"
male connectors at both ends. Place the stand-alone short-haul
modem within 25 feet of the printer (it is preferred that it is
placed next to the printer). Connect one end of the cable to the
appropriate serial port on the printer (refer to your printer's
manual for this information) and the other end of the cable to the
area marked "RS 232" on the back of the stand-alone short-haul
modem (Figure 3).
To connect the stand-alone modem to the last unit of the
Multi-Link chain, you will need a 2 conductor, 16 to 24 awg,
unshielded twisted pair telephone wire. Strip about 1/4" of
insulation off of each end of the paired wires. Connect one end of
the wires to the plug marked "LINE" on the back of the
Figure 3
stand-alone modem (it does not matter which wire is attached to
which opening as long as it is in the "LINE" plug and not the
"12V ac/dc PWR" plug) and tighten the screws until the wires are
secure. Connect the other end of the wires to the plug marked
"LINE 2" in the dual short-haul modem on the last unit of the
chain and tighten the screws securely. Then take the two wires
from the power transformer (provided by Chamberlain) and
connect them to the plug marked "12V ac/dc PWR" on the back of
the stand-alone short-haul modem. It does not matter which wire
is attached to which opening as long as the opening is in the area
marked "12V ac/dc PWR" ( or severe damage to the modem will
occur). Then plug the power transformer into a 110/120 Vac
outlet. Also, make sure that the switch located on the front of the
stand-alone short-haul modem is switch to the position marked
"PORT 1".
Last Unit of the Multi-Link System
Computer Cable
with 2 "DB25"
Connectors
Paired wire
from previous
unit
Stand-Alone
Short-Haul
Modem
Printer
TB 2
RS 232 Port 1
Paired Wire
Line 1
TB 3
RS 232 Port 2
TB 5
Line
12V ac/dc
Power
RS 232
Line 2
Modem Set
to Port 1
Twisted Pair Wire
TB 5
Dual Modem
6
Main Processor Board
CONNECTING A PRINTER TO THE FIRST UNIT OF THE
MULTI-LINK CHAIN
the wires to the plug marked "LINE" on the back of the
stand-alone modem (it does not matter which wire is attached to
which opening as long as it is in the "LINE" plug and not the
"12V ac/dc PWR" plug) and tighten the screws until the wires are
secure. Connect the other end of the wires to the plug marked
"LINE 1" in the dual short-haul modem on the first unit of the
chain and tighten the screws securely. Then take the two wires
from the power transformer (provided by Chamberlain) and
connect it to the plug marked "12V ac/dc PWR" on the back of the
stand-alone short-haul modem. It does not matter which wire is
attached to which opening as long as the connection is made in
the opening marked "12V ac/dc PWR" (or else severe damage will
occur). Plug the power transformer into a 110/120 Vac outlet.
Also, make sure that the switch located on the front of the
stand-alone short-haul modem is switch to the position marked
"PORT 2".
Due to the physical configurations of your system, it may be
necessary to connect a printer to the first unit of the Multi-Link
system. To connect a printer to the first unit of the Multi-Link with
the use of a stand-alone short-haul modem, you will need a
computer cable with "DB25" male connectors at both ends. Place
the stand-alone short-haul modem within 25 feet of the printer (it
is preferred that the modem is placed right next to the printer).
Connect one end of the cable to the appropriate serial port on the
printer (refer to your printer's manual for this information) and
the other end of the cable to the area marked "RS 232" on the
back of the stand-alone short-haul modem (Figure 4).
To connect the stand-alone modem to the first unit of the
Multi-Link chain, you will need a 2 conductor, 16 to 24 awg,
unshielded twisted pair telephone wire. Strip about 1/4" of
insulation off of each end of the paired wires. Connect one end of
Figure 4
First Unit of the Multi-Link Chain
Port 1
TB 2
RS 232 Port 1
Line 1
Paired Wire
Stand-Alone
Short-Haul
Modem
TB 3
RS 232 Port 2
Line 2
Port 2
Computer Cable
with 2 "DB25"
Connectors
TB 5
Line
Pair wired
to Unit 2
Twisted pair
wire
12V AC/DC
Power
TB 5
7
RS 232
Modem set to
Port 2
Printer
HOOKING UP AN EXTERNAL TELEPHONE MODEM
stand-alone short-haul modem and then connect the other end of
the cable to the appropriate area on the external telephone
modem. Plug the telephone line into the appropriate area on the
external telephone modem (refer to the external telephone
modem's manual for this location).
The Infinity system can communicate via an external telephone
modem to a terminal (or a computer using terminal emulation
software). If you have an external telephone modem directly
connected to the first unit of the Multi-Link chain, and the cable
distance between the external telephone modem and the system
is under 30 feet, do not remove this connection. If this
connection becomes disconnected, refer to the installation
manual that was included with your Multi-Link system for
instructions on reinstallation. If the distance of the cable between
the system and the external telephone modem is going to be
further than 30 feet, you will need to connect it to a stand-alone
modem which will then be attached to the first unit of the chain.
To connect the stand-alone short-haul modem to the first unit of
the Multi-Link chain, you will need a 2 conductor, unshielded, 16
to 24 awg twisted pair telephone wire. Strip about 1/4" of the
installation off of each end of the wires. Connect one end of the
pair to the plug marked "LINE" on the back of the stand-alone
short-haul modem and tighten the screws securely. It does not
matter which wire is attached to which opening of the plug as
long as they are attached to the two openings under the area
marked "LINE". Connect the opposite ends of the twisted pair to
the area marked "LINE 1" located on the dual short-haul modem
(see Appendix 2) connected to the first unit of the Multi-Link
chain and tighten the screws securely. Then connect the two
wires from the power transformer to the area marked "12V ac/dc
PWR" on the back of the stand-alone short haul modem. It does
not matter which line is attached to which opening as long as it is
one of the openings under the area marked "12V ac/dc PWR" (or
severe damage to the modem will occur). Plug the transformer
into a 110/120 Vac outlet. Also, make sure that the switch on the
front of the stand-alone short-haul modem is switched to the
"PORT 2" position (Figure 5).
NOTE: An external telephone modem may be connected to the
same telephone line as the Infinity system, but if this is done the
Infinity should have the multiple entry option installed so it does
not come on line when the modem is active.
For this installation, you will need to attach a stand-alone
short-haul modem between these two devices. To connect the
external telephone modem to the stand-alone short-haul modem,
you will need a computer cable with a "DB25" male connector on
both ends. Place the stand-alone short-haul modem within 25
feet of the external telephone modem (it is preferred that it is
right next to the external telephone modem). Connect one end of
the cable to the area marked "RS 232" on the back of the
Figure 5
First Unit of the Multi-Link Chain
Port 1
TB 2
RS 232 Port 1
Line 1
Paired Wire
Stand-Alone
Short-Haul
Modem
TB 3
RS 232 Port 2
Line 2
Port 2
External Telephone
Modem
TB 5
Line
Pair wired
to Unit 2
Computer Cable
with 2 "DB25"
Connectors
12V ac/dc
Power
Twisted pair
wire
TB 5
8
RS 232
Modem set
to Port 2
Telephone
Line
TESTING THE MODEMS
DUAL SHORT-HAUL MODEMS
STAND-ALONE SHORT-HAUL MODEMS
1. To make sure that the dual short-haul modem is getting power,
check to see if the red LED in the bottom right-hand corner
(DS9) is lit (Appendix 2). If it is not, check the wiring and the
connections between area TB 5 on the modem and area TB 5
on the main processor boards.
1. Make sure that the switch on the front face of the modem is
under the appropriate port (For example, if the stand-alone
modem is connected to the first unit in the system, the switch
should be in the "PORT 2" position)
2. Verify that the red LED marked "PWR" on the front panel of the
modem is lit. This LED ensures that power is being received
by the modem. If the LED is not lit, check the wires and the
connections between the wall transformer and the modem.
Also, make sure that the connector screws are holding the
wires securely.
3. If there is a terminal connected to the modem, the yellow LED
on the front of the modem marked "TXD" should flicker when a
key is pressed on the terminal.
4. Make sure that the green LED on the front of the modem
which is marked "XMIT" is lit continuously. If it is not, check
the connection between the modem and the terminal.
5. If the modem is connected to the last unit in the Multi-Link
chain, press the "CTRL" and the "F" keys on the terminal at the
same time. If the green LED marked "RXD" on the front panel
of the modem flickers slightly, information is getting through
the entire system.
2. To ensure that information is being passed from unit to unit,
check to make sure that the LEDs on the modem (with
exception of the "PWR" LED discussed above) are flashing
randomly. If these LEDs are not flashing, check the
connections in the areas marked "LINE 1" and "LINE 2" to
ensure that the screws are securely tightened.
9
APPENDIX 1
MAIN PROCESSOR BOARD
GUIDE TO CONNECTIONS, ADJUSTMENTS AND INDICATORS
(If board is a revision
"E" or "F" these pins will
also be used for DC power)
Grounding Screw
Clear to Send
RS 232 Out
Ground
RS 232 In
Request to Send
3 Amp Fuse
TB 2
(RS 232 Port 1)
TB 3
(RS 232 Port 2)
Clear to Send
RS 232 Out
Ground
RS 232 In
Request to Send
Output Power
Large Display
Connector
Small Display
Connector
TB 1
12Vac power
Baud Rate
Selections
TB 5
+12Vdc Power (+)
+12Vdc Power (-)
Thermistor Connection
Main
Keypad
Input Power
12Vdc Power (+)
12Vdc Power (-)
(On revision "E" and "F"
boards, these pins do
not exist. DC power is
available from block TB1)
TB 13
Power ON Indicator
10
Contrast
Adjustment
Pot
APPENDIX 2
DUAL SHORT-HAUL MODEM
Line 2
Line 1
TB 5
+ 12V
dc PWR
DS4 DS1 DS3 DS2
Port 1
Front View
12V
ac/dc
Pwr
Line
RS 232
Rear View
11
Yel
Grn
XMIT
Port 2
Red
TXD
PWR
To RTS
RXD XMIT TXD
To In
To Out
Short Haul Modem
RCV
To GND
To CTS
To RTS
To In
To GND
To Out
To CTS
XMIT
TXD
RXD
RCV
Power
STAND-ALONE SHORT-HAUL MODEM
Grn
RXD
Grn Red Yel Grn
RCV
Red
Port 1
Port 2
DS9 DS5 DS6 DS7 DS8
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