https://forge.codesys.com/forge/talk/Runtime/thread/166104b4ca/2022-06-23T20:05:19.614000ZRecent posts to Raspberry PI CM4 Cannot connect to modbus through rs4852022-06-23T20:05:19.614000Z2022-06-23T20:05:19.614000Zwalkrandhttps://forge.codesys.com/u/walkrand/https://forge.codesys.com815c5b8731427abaf39af136a650850bca64f0cf

<div class="markdown_content"><p>Hi,</p> <p>I have seen this problem many times throughout the forum but none of the solutions have helped. I am using raspberry PI CM4 with debian buster as the OS. I am to trying to connect to separate IO modules through RS485 communication. I have attached a screenshot below, everything has been working in the past, but is not working the moment so I am curious to what might have changed.</p> <p>The modules are being called correctly through modbus and then set in the config file as </p> <p>Linux.DeviceFile.2=/dev/ttyAMA3, which is the correct RS485 port that is from the industrial raspberry pi model that I have.</p> <p>Thank you</p></div>