TRANSIT Ultimate | installation guide
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3.2
RS485-OSDP wiring
The RS485-OSDP wiring should be connected to the RS485 connections on the OSDP Installation Board (OSDP-IB) or
directly to the PCC485. See wiring picture below.
For point-to-point communication enable the termination resistor. PCC485 switch 1 to ON position. See picture below.
Figure 8: RS485-OSDP point-to-point wiring
For multi-drop communication disable the termination resistor on the PCC485 on all devices except the last device. The
termination resistor should be enabled on the last device in a multi-drop communication system. See picture below.
Figure 9: RS485-OSDP multi-drop wiring
For more details refer to the separate PCC485 installation guide.
PCC485
A B
OSDP Control Panel
B A
ON
1 2
PCC485
PCC485
PCC485
B A
OSDP Control Panel
#
B A
#
B A
#
B A
#
B A
#
B A
#
B A
OSDP-Kit
OSDP-Kit
OSDP-Kit
B A
ON
1 2
B A
OF
F
1 2
B A
1 2
OF
F
