bongkeat Posted February 15, 2022 Report Share Posted February 15, 2022 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. Quote Link to comment Share on other sites More sharing options...
bongkeat Posted February 15, 2022 Author Report Share Posted February 15, 2022 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. Quote Link to comment Share on other sites More sharing options...
MVP 2023 kratmel Posted February 15, 2022 MVP 2023 Report Share Posted February 15, 2022 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... Quote Link to comment Share on other sites More sharing options...
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