I recently added a Modbus and RS485 gateway to my system to control my Nilan ventilation system, replacing my old USB-RS485 dongle. The gateway, a Riot USR-TCP232-410S, works fine initially, but I’m encountering periodic communication errors every 2-5 minutes. The OpenHAB logs show a timeout read error, which is quite annoying despite the system still functioning.
I’ve tried adjusting the UART packet timing and activating ModbusTCP polling, but neither resolved the issue. I’m now considering whether the RS485 bus requires a 120-ohm termination resistor, as another user suggested. My setup uses the same cable and length as before, but perhaps the new gateway is more sensitive.
Has anyone else experienced similar issues with this gateway? Any advice on troubleshooting or resolving the timeout errors would be greatly appreciated! I’m eager to get this working smoothly without the periodic interruptions.