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LK3U PLC-Communication port pin definition

Communication port pin definition
9-pin femalepin numberRS-232
Port11
2TX
3RX
4
5GND
6
7
8
9
* The wiring between RS-232 communication port is TX connected to RX, RX is connected to TX, and GND is connected to GND.
9-pin femalepin No.RS-485(1)RS-485(2)CAN
Port21A+
2CANL
3CANH
4
5GNDGNDGND
6B-
7
8B-
9A+
* The wiring between RS-485 communication ports is A+ connected to A+, B-connected to B-;

* The CAN communication port is connected to CANH to the expansion module CANH (multiple modules are together), CANL is connected to the expansion module CANL (multiple modules are together), please be sure to use the communication line with shield layer, and the length is not More than 500mm. The last module Please be sure to switch the terminating resistor to the connected terminal.

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