louisgermain6 Posted December 20, 2019 Report Share Posted December 20, 2019 Hey guys, I wish you could help me with this one... I'm currently doing a project using a pump that communicates by Modbus RTU to my US7-B5-TR22. The serial communication and code is done by USB. I'm aware that you recommend to use a Prolific USB to serial converter, I have a FTDI one that worked perfectly in an other configuration but still modbus using serial by USB. Now I can't understand why on my new configuration it fails. I "sniffed" the communication between the PLC and my pump using my computer and a serial terminal, the request of the PLC and response of the pump are correctly sent. The problem is that the PLC doesn't seem to receive or decode well the response because every sessions in my remote slave are failed. Thanks in advance for your help, I attach a piece of code for you to have a look of what I've done. Cheers, Louis test.ulpr Quote Link to comment Share on other sites More sharing options...
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.