Figure 7: Connecting Multiple Units Through Short-Haul Modems; Figure 8: Rs232 Connections With Dual Short-Haul Modems And Multiple Units - Chamberlain SENTEX Infinity Series Installation Instructions Manual

If The Units Are 30 Or More Feet Apart:
Connect the units through the dual short-haul modems (See Figure 7).
1. On the first unit, insert the 2 conductor cable into the LINE 2 plug and tighten the screws
securely. It does not matter which wire is inserted into which opening of the plug (See Figure 8).
2. On the second unit, insert the the loose end of the 2 conductor cable into the LINE 1 plug and
tighten the screws securely (See Figure 8).
3. To connect additional units, repeat steps 2 and 3. The same connections are made between the
second unit and the third unit, the third unit and the fourth unit, etc.

Figure 7: Connecting Multiple Units Through Short-Haul Modems

XMIT (GRN)
DS2
DS3
TSD (YEL)
PORT 1
DS1 RSD (RED)
DS4 RCV (GRN)
RTS
Line 1
IN JUMPER
CTS
GND
TO RTS
OUT
CTS
RTS See
IN
Enlarged
GND
Image
Line 2
OUT
Below
CTS
DS8
XMIT (GRN)
DS7
PORT 2
TSD (YEL)
DS6
RSD (RED)
DS5
RCV (GRN)
DS9
POWER (RED)
TB 5
+12 V
DC PWR
DUAL SHORT-HAUL MODEM
NOTE: DSH Modem
nomenclature will
appear upside-down in
the unit as shown.

Figure 8: RS232 Connections with Dual Short-Haul Modems and Multiple Units

Page 10 of 31
PORT 1
CTS
Line 1
OUT Port 1
(TB2) GND
GND
IN
RTS
CTS
OUT
Port 2
GND GND
(TB3)
Line 2
IN OUT
RTS CTS
RS232 PORT
PORT 2
TB 5
+12 V
DC PWR
1st MULTI-LINK UNIT DUAL SHORT-HAUL MODEM
DSH Modem
DS2 XMIT (GRN)
DS3 TSD (YEL)
DS1 RSD (RED)
DS4 RCV (GRN)
CTS
RTS
See
IN OUT
Enlarged Port 1
GND (TB2)
Image
OUT
IN
Below
CTS RTS
RTS CTS
See
IN OUT
Port 2
Enlarged
GND
(TB3)
Image
IN
Below
RTS
DS8
XMIT (GRN)
RS232 PORT
DS7
TSD (YEL)
DS6
RSD (RED)
DS5
RCV (GRN)
DS9
POWER (RED)
MIDDLE MULTI-LINK UNIT(S)
Doc 6001565
DS2 XMIT (GRN)
DS3 TSD (YEL)
PORT 1
DS1 RSD (RED)
DS4 RCV (GRN)
RTS
See
Line 1
IN
Enlarged
GND
Image
OUT
Below
CTS
RTS
IN
JUMPER
CTS
GND
Line 2
OUT TO RTS
CTS
DS8
XMIT (GRN)
DS7
PORT 2 TSD (YEL)
DS6
RSD (RED)
DS5
RCV (GRN)
DS9
POWER (RED)
TB 5
+12 V
DC PWR
DUAL SHORT-HAUL MODEM
Infinity
Multi-Link Unit
CTS
OUT
GND
IN
RTS
CTS
OUT
Port 1
GND (TB2)
IN
RTS
CTS
OUT
Port 2
GND
(TB3)
IN
RTS
RS232 PORT
LAST MULTI-LINK UNIT
1016F8
Rev C