
Using the Modbus Ports
870USE10110 July 2004 125
Interconnect
Cables
The illustration below shows the pinout for the 170 MCI 02x xx Modbus Plus or
Modbus RS485 interconnect cables (10 in, 3 ft, 10 ft and 30 ft).
Modbus RS485
Connector T
(DB9 Base)
The illustration below shows the pinout for the Modbus RS485 connector T (DB9
base).
RJ45 Connector
RJ45 Connector
Shield
Not used
Signal
common
Not used
TXD-
TXD+
RXD+
RXD- RXD-
RXD+
TXD+
TXD-
Not used
Signal
common
Not used
Shield
Interconnect
Cables
1
3
6
4
5
8
2
7
1
3
6
4
5
8
2
7
RJ45 Shielded Connector
RXD-
TXD+
Signal
common
RXD+
1
3
4
5
7
2
6
TXD-
Shield 8
Shell
RXD-
TXD+
Signal
common
RXD+
RXD-
Shield
1
3
4
5
7
2
6
8
Shell1/8W
1%
1206
51.1100V
CER
1206
.1UF
RJ45 Shielded Connecto
721 364 5 8 9 M1 M2
RXD+ TXD+ TXD-
DB9 Connector
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