Wiring Connections; 3-Wire Rs-232 Wiring; 4-Wire Rs-422 Wiring; 2-Wire Rs-485 Wiring - ICPDAS ECAT-2610 User Manual

EtherCAT to Modbus RTU Gateway

2.4 Wiring Connections

3-wire RS-232 Wiring

4-wire RS-422 Wiring

2-wire RS-485 Wiring

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NOTE
1. Usually, you have to connect all signal grounds of
RS-422/485 devices together to reduce
common-mode voltage between devices.
2. Twisted-pair cable must be used for the DATA+/-
wires.
3. Both two ends of the cable may require a
termination resistor connected across the two
wires (DATA+ and DATA-). Typically 120 Ω
resisters are used.
The Data+ and B pins are positive-voltage pins,
4.
and Data- and A pins are negative-voltage pins in
the above figure. The B/A pins may be defined in
another way depending on devices, please check
it first.
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