https://forge.codesys.com/forge/talk/Runtime/thread/bcedd14f1a/2020-02-27T16:09:45.632000ZRecent posts to Assinging ttyUSB5 to COM port2020-02-27T16:09:45.632000Z2020-02-27T16:09:45.632000Zdvdendehttps://forge.codesys.com/u/dvdende/https://forge.codesys.come3f15cc1e7b18ab35ce462f4ce649249ae2d1232

<div class="markdown_content"><p>My Raspberry Pi has several USB modules (modem and FTDI for NMEA sensor). Next to this I like to use an additional FTDI RS-485 converter for the USB port. With this converter I like to have ModBus RTU communication. The converter is recognized and working. I tried in Codesys to setup the communication but I always get a RESPONSE_TIMEOUT at byModBusError in Codesys. I think the wrong ttyUSB port is assigned to the COM1 port.</p> <p>Is there a way to assign ttyUSB5 to COM1 port?</p> <hr/> <p>Found the solution by myself. Place extra lines in the CodesysControl.cfg with the COM ports</p> <p><span>[SysCom]</span><br/> Linux.Devicefile=/dev/ttyUSB<br/> portnum := COM.SysCom.SYS_COMPORT1;<br/> portnum := COM.SysCom.SYS_COMPORT2;</p> <p>In Codesys you can use the assigned port.</p></div>