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E. Modbus RTU/RS485, Modbus TCP/Ethernet Interface
Connector S4
RJ10 4-4 Pin Pin Name Description Note
1 GND1 (**) -
(**) Connect the GND signal
among Modbus devices with a
line distance > 300 ft. (100 m)
2 Rx/Tx+ Data reception/transmission (A+)
3 Rx/Tx- Data reception/transmission (B-)
4 +V Reserved -
Cable Type: Flat telephone cable for pin 4-4 conductor 28 AWG
Connector S5
RJ45 Pin Name Description Note
1 TX+ Data + Transmission
2 TX- Data - Transmission
3 RX+ Data + Reception
4 n.c.
5 n.c.
6 RX- Data - Reception
7 n.c.
8 n.c.
Cable Type: Use standard category 6 cable according to TIA/EIA-568A.
S5 Female RJ45 Connector
S4 Female RJ10 Connector
Yellow LED
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