BRUEL & KJAER VIBROCONTROL 8000 - 9.1.2 Modbus Serial Port (RS-232, RS-422;485)

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VC-8000 MPS
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9.1.2 Modbus Serial Port (RS-232, RS-422/485)
The SAM provides a single RJ45 connector for Modbus serial
communication. The RJ-45 port is used for convenience; this connector
is not a network port.
The serial port can used to connect to RS-232, RS-422 (4-wire), RS-485
(4-wire), and RS-485 (2-wire) Modbus clients. See Table 6 below for the
RJ-45 port pinout.
An RJ-45 breakout board is used to connect the Modbus client cable(s)
to the serial port (RJ-45) on the rack.
Figure 9-4) Serial Modbus port
RJ-45 PIN RS-485/422 RS-232
Figure 9-5) RJ-45 Breakout board
4
RD-
Rx
5
RD+
-
6
COM
COM
7
TD-
Tx
8
TD+
-
Table 9-2) SAM Modbus (RJ-45) Serial Connector
Figure 9-6) RS-232 and RS-422/485 (4-Wire) wiring examples
Protocol Maximum Cable Length
RS-232
30 m (100 ft.)
RS-422
1200 m (4000 ft.)
RS-485
1200 m (4000 ft.)
Table 9-3) Protocol maximum cable lengths