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Rj-11 to Serial port pinout

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I have a Vision 120 PLC, I would like to communicated it to my PC via USB port. But the communication cable is not come with the unit. Could you please provide me pin out for Rj-11 (4 pin) to serial port (9 pin female) pinout diagram? I have the Serial (male) to USB. Appreciate your prompt response. 


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  • MVP 2023

Some quastion:

- is  it  USB  driver installed correctly and com port appear in Hardware?

- is it correct com port selected in Visilogic and different speed selection tested?

If yes - try to run terminal program on PC, select com port  - connect 2 to 3 pin on USB-RS232 adapter and test loopback  - is it TX information appear in RX terminal buffer.

If terminal test OK  - doble check wiring  - only 3 wire needed for connect.

If terminal loopback not work - change USB-RS232 hardware and reinstall  driver. 


P.S.  If V120 is used - you can stop internal program via info mode and try to connect... 

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