I have two RUT956 routers set up at different sites. Currently, they communicate over a 4G cellular network using RMS VPN to access devices on each network.
Due to changes on site, I now need the same setup but using RS485 to communicate with a PLC/Datalogger. The goal is to poll/send data between the two sites over the RUT956 units.
Is it possible to configure this? I’ve tried setting one site as a Modbus TCP Server and the other as a Modbus TCP Client, but haven’t had success yet.
Thank you for your inquiry. Your request is currently under review and analysis. Once the evaluation is complete, I will get back to you with further information, findings, or suggestions.
If you already have the VPN set up with proper routes configured to reach each RUT’s LAN end devices and communication is working, then to poll PLC data between the two sites, you could make use of the Serial over IP feature. This functionality allows communication from a serial device connected to one router to another serial device connected to a different router across the public IP or VPN tunnel.
For more information and guidance, please refer to our wiki article on Serial Over IP communication between Server and Client configuration example here:
So, i tried your suggestion and i could see my on my PLC that its Communicating, but i could not reed any Addresses. i have managed to set up the “Modbus” Options to read data from one PLC, but i need to send data back. Here is a Example of how set it up: