Hello,
Each serial interface can only be enabled in one service. Thus, it is not possible to have multiple services configured for the same RS232 or RS485 interface. Since RS232 is already in use, it cannot be used in other services. There’s not much that can be done without additional workarounds/scripts. The only suggestion that comes to mind is to enable custom Modbus registers on RUT956 and write to them (for example, via MQTT). Then, poll those registers via RS485.
Kind Regards,