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9
Installation
RS-485 Connection
•
RS-485 should be AWG24, twisted pair, and maximum length is 1.2 km.
•
Connect a termination resistor (120Ω) to both ends of a RS-485 daisy chain connection. It should be installed at both
ends of the daisy chain. If it is installed in the middle of the chain, the performance in communicating will deteriorate
because it reduces the signal level.
•
Up to 31 modules can be connected to the master device.
NO
COM
NC
NO
COM
NC
RELA
Y 4
RELA
Y 5
NC
COM
NO
NC
COM
NO
RELA
Y 7
RELA
Y 6
12V
0V
TRX+
TRX-
GND
POWER
GND
AUX IN 1
GND
AUX IN 0
AUX
RS-485
ON OFF
TERM
4
5
7
6
NO
COM
NC
NO
COM
NC
RELA
Y 4
RELA
Y 5
12V
0V
TRX+
TRX-
GND
POWER
RS-485
ON OFF
TERM
Access Controller
OM-120
Termination
RS-485
TRX+
RS-485
TRX-
Terminating
resistance
(120Ω)
GND