Which part to buy in order to communicate with MODBUS RTU over SERIAL.

petpet1 · Post by **petpet1** » 18 Oct 2022, 14:39

Hello,

I am a bit confused about the difference between the modules with item no. 100090 and item no. 100068.

I want to connect two devices to my RevPi, one of them uses MODBUS RTU over RS485 and the other uses MODBUS RTU over RS232.
Which parts do I need to buy in order to be able to communicate with these?

Best,
Petter

Post by **giuseppe** » 28 Oct 2022, 08:23

Hello Petter,

I would recommend using the Modbus RTU Gateway and configuring it as RS232 or RS485 (or RS422). This is much easier to configure than the Serial Gateway.

If you have a RevolutionPi Connect +/SE/S, you can use the front interface as RS485.

: RevolutionPi Connect RS485.png (82.96 KiB) Viewed 2273 times

If you have a RevolutionPi Core 3/3+/SE/S, you can use one of the front USB ports and configure it as a virtual Modbus RTU Master/Slave (RS232/RS485).

Additional Information:
Modular Gateway
Gateway module for serial network
Gateway module for Modbus RTU
RevolutionPi Gateway Tutorial

Best regards
Giuseppe Pagano