The Industrial Raspberry Pi Forum

Posted: **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

Posted: **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 3091 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

The Industrial Raspberry Pi Forum

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

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

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