bongkeat

I try this diagram above (https://torque.mesalabs.com/wp-content/uploads/sites/4/2015/01/DownloadingNewFirmware-to-PLC.18JUL2018.pdf) , but it not working.

Greeting. 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.