LabVIEW MODBUS16 communication

[floresma]

Hello,

Does anyone have a good example of how to communicate with the following protocol via RS232 MODBUS16 CRC?

• Baud Rate: 19,200
• Data bits: 8 Bits
• Parity: None
• Stop Bit: 1
• CRC: MODBUS16

Thanks,

[JensG69]

Modbus16 - I don't know about such a protocol.

There are several LabVIEW libraries available for download that are capable of

Modbus ASCII, Modbus RTU and Modbus TCP.

All of these include examples.

Regards, Jens

[floresma]

Thanks for the information.  Where can I find the libraries?

Thanks,

[NIquist]

Easiest way is the VI Package Manager https://vipm.jki.net/

If you don't use that just do a search for "LabVIEW Modbus".

[floresma]

I was able to install the libraries, however, how can I send the following command to a device?  None of the functions have a data send input.

0xA5 0x05 0x0D CRC

Thanks,

[RavensFan]

What does that command mean?

Did you look at the examples for Modbus that are installed with the libraries such as the Master?

[Kyle97330]

There's like 3 or 4 MODBUS libraries, so without you telling us which one you actually got, it's difficult to help.

As a general note, to send what you're trying to send, you're probably looking for something called "Modbus write multiple holding registers.vi", and you need to convert those 3 things you're trying to write from hex into 16-bit unsigned integers.  So the "data send input" might be labeled something like "Registers", and would be an array of U16.

[floresma]

Thanks to everyone for all the help.  I was able to get it to work:)