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Modbus RTU over TCP/IP

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Dear All


I am looking for  Modbus RTU over TCP/IP example VI. Does anyone  have experience with this protocol?


Please kindly give me some advice!


Thanks and Regards




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Message 1 of 5
Accepted by topic author Luong.Tran
08-27-2015 04:09 PM



Start here for more information and the LV ModBus lib.



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Message 2 of 5

Hi Luong,


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.

Matt S.
Industrial Communications Product Support Engineer
National Instruments
Message 3 of 5
Accepted by topic author Luong.Tran
08-27-2015 04:09 PM

Important addition:

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.

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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

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