LK3U PLC-Communication port pin definition

Communication port pin definition

9-pin female	pin number	RS-232
Port1	1
	2	TX
	3		RX
	4
	5	GND
	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 female	pin No.	RS-485(1)		RS-485(2)		CAN
Port2	1			A+
	2						CANL
	3					CANH
	4
	5	GND		GND		GND
	6		B-
	7
	8				B-
	9	A+

* 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. LK3U PLC General parameters LK3U PLC-Communication port pin definition LK3U PLC Component range LK3U PLC Supported instructions LK3U PLC Special relay M function description LK3U PLC Special register D function description LK3U PLC High-speed counter instructions LK3U PLC High-speed counter instructions LK3U PLC Communication port LK3U PLC High speed output LK3U PLC Analog read and write instructions LK3U PLC CAN function LK3U PLC PID function