I am hoping that some kind person in the RA community will help me with making a modbus connection to my Xytronix Controlbyweb controllers. I have set up one of my controllers so that you can try to connect to it. Here is the user manual for this controller. The discussion of modbus starts at page 32.
I have set up a webcam so that you can see the controller. You may need to enter the user name “user2” and password “Assistant3”.
I have set up port forwarding so that you can have direct access to the modbus port of this controller: fdf3b86.glddns.com:8004.
You can click here to turn relays on and off at this controller, and you can see the status of the four relays.