Supporting Modbus RTU communication 3-way timing interruption PLC communication module

Description:

* CPU: ARM CortexTM M3 CPU.

* Digital Input: Transistor input, supporting source drain type.

* Digital Output: NPN transistor output.

* High-Speed Input: 2-way AB input/4-way separate high-speed counting.

Specification:

COM1/COM3
Pin1	Rx-(B)
Pin2	RxD_PLC (COM1 RS232)
Pin3	TxD_PLC (COM1 RS232)
Pin4	Tx-
Pin5	GND
Pin6	Rx+(A)
Pin7	RxD_PLC(COM3 RS232)
Pin8	TXD_PLC(COM3 RS232)
Pin9	Tx+

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