L2234
Emax
120/158
Model
Scale
Page No.
Doc. No.
Apparatus
1SDH000460R0002
L2778
15.2 PR120/D-M - COM communication module
15.2.1 General characteristics
Dedicated communication module for connecting the relay to a Modbus net, and for remote supervisory and control activities on the circuit-breakers.
15.2.2 Front view
- "Power" LED (lit when Vaux is installed)
- LED RX/TX (data send/receive signal).
15.2.3 Releases complete with the module
- optional for PR122/P
- optional for PR123/P
15.2.4 Power supply
The PR120/D-M - COM communication module is only powered by the relay if there is a 24V auxiliary voltage available.
15.2.5 Connection
Refer to fig. 45 in the wiring diagram provided in this manual.
15.2.6 Communication functions available
The communication function on the PR122/P, PR123/P releases with PR120/D-M - COM is listed in the table:
PR122/P or PR123/P + PR120/D-M - COM
Protocol Modbus RTU
Physical interface RS-485
Baud rate 9600 - 19200 bit/s
15.2.7 PR120/D-M - COM module menu
Parameter / Function Values Notes
Local/remote Local/remote
Serial address 1 ... 247 247 default address
Baudrate 9600 bit/s
19200 bit/s
Physical protocol 8,E,1 - 8,0,1 - 8,N,2 - 8,N,1
Addressing Modbus standard
ABB
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