https://forge.codesys.com/forge/talk/Engineering/thread/4ac69b246d/Recent posts to Codesys MODBUS RTU devicesenMon, 13 Jul 2026 00:34:47 -0000https://forge.codesys.com/forge/talk/Engineering/thread/4ac69b246d/?limit=25#f63a<div class="markdown_content"><p>I am trying to use Codesys to connect by Modbus RTU to an Arduino UNO, I add the Modbus COM Port but when I try to add the master and the slave I don't have these options, I attach an image of the device manager. I am using Codesys 3.5 SP21.</p></div>repc2026Mon, 13 Jul 2026 00:34:47 -0000https://forge.codesys.com242d8e6f0ae52da7c27c71f267e543f3762db306