ratsept Posted February 14, 2022 Report Share Posted February 14, 2022 Hi, I'm having a really hard time getting UAC-CX-01RS4 attached to a US5/7-x10-TR22 working. I have followed the manuals as close as I can and the software is not giving any warnings or anything but for some reason there is no activity on the RS485 bus. I have checked the bus with a USB-RS485 cable and the PLC is not causing any traffic on it. I have only 3 devices on the test bus - the PLC, the USB cable and an RS485 IO module from Wellpro. The IO module works fine when I send it requests from the USB cable. And I can see the responses arrive over USB as well. But when I run he PLC nothing happens. What I need the PLC to do is act as modbus master and periodically poll the IO module for data. Can you please share some example code of modbus master on RS485 bus? 1 Quote Link to comment Share on other sites More sharing options...
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