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7.8 Serial Communication Ports

7.8.1 Port1 (Standard Local Bus): Connectors S1, S2, S3

Modbus RTU/RS485 Serial Interface

Connector S3 accepts the C4-OP local

interface terminal. See th

e C4-OP Section

for more detail.

1 9

0 1

Connector S1/S2

RJ10 4-4 Pin Pin Name Description Note

1 GND1 (**) -

(*) Enable #8 DIP Switch on

last device on Modbus RS485

line

(**) Connect the GND signal to

Modbus devices with a line

distance > 300 ft. (100 m)

2 Tx/Rx+ Data reception/transmission (A+)

3 Tx/Rx- Data reception/transmission (B-)

4 +V Reserved -

Cable Type: Flat telephone cable for pin 4-4 conductor 28 AWG

Chromalox C4 User Manual

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