The Modbus Library posted by K C is the older version not supported by NI.
I would recommend using the updated library on NI Labs created by our Systems Engineering group.
Additionally, if you have the DSC module, you can use built in Modbus functionality using I/O servers.
That library works for 2012-current and is still not supported except by me. Meaning if people ask a question and I'm on vacation the question generally doesn't get answered.
If you have LabVIEW 2014 and either RT or DSC, you also get the R&D supported version of that library. This means you can call into AE support and get help with it.
Hello! I am worried about this topic. Not a simple thing, but Modbus TCP/IP is one kind of Modbus protocols designed for controlling and supervising equipment over TCP or IP. It is possible to use Modbus over Internet or Intranet if a device supports TCP/IP sockets and you know how to execute a TCP driver. It explains how it works and what can be associated with https://www.eltima.com/modbus-over-ethernet/