I don't see this topic elsewhere, so I am creating it.
I have a new feeder, OPTO advised me to use Modbus/TCP, so I ordered it that way. Now I want to connect it without spending an inordinate amount of time. I've never programmed Modbus or TCP before but I have successfully handled other serial connections. How should I proceed? Is there a worked example that will let me avoid the wasteful frustrating stage of guessing a command, sending it out, and getting nothing back?
I've downloaded three technical notes so far but am not seeing a clear path forward.