how to configure modbus using LabVIEW?

[Srinivas Kharsada Patnaik]

Hello All,

I want to know is there any possibility to configure modbus using LabVIEW?

Using LabVIEW can we be able to interact with the modules and controllers through modbus communication?If there is any solution for that then let me know how to do that.

Thanks

Srinivas

[Nishant]

Yes Mr. Shrinivas Absolutely,

         It is Possible to configure modbus using LabVIEW, there are certain modbus drivers, which I am attaching here through which you can build the VI from which you can interact with the modules which also have the modbus implemented and to do this is quite easy, the help file for using modbuds driver is also attached with this. we already have built the program for that but for the certain reasons i am unable to provide you that vi but i am sure that with this you can do it, if u face any problems during building VI, contact me i ll be there for sure to back you.

Thanks,

Nishant

[pincpanter]

Hi Nishant,
do you know if there is a similar driver for Modbus slave and old LabView (say version 5) ?

Paolo

[Srinivas Kharsada Patnaik]

Thanx Mr. Nishant,

thanx for your reply.

As I am new to this LabVIEW world, if you could provide some basic stuff regarding this, I will be glad.can you just explain me how you could do that or the exact funda behind it?

anyway, thanks Sir again.

[Nishant]

Sorry Mr. Paolo,

                    but i dont know about modbus slave or older Labview version and currently i m using LV7.1 and we are working quite easily right now, whatever you can find it on the NI's site, or you can ask to NI's CS department they can help you either and Mr. Srinivas I llcomm to you 2moro morning to help u coz now my office hours r end.

Thanks,

Nishant

[tst]

How about the links here?

[Donald]

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@pincpanter wrote:
do you know if there is a similar driver for Modbus slave and old LabView (say version 5) ?

---

Several of the links in Khalid's post that tst directs you to have gone dead in the past year or so.
One of them (www.air.nl. …) used to lead to Maarten van Bree's Modbus VIs that were free and done in LV v4.0.2. You can still get those VIs (as v4.0.2) from this forum in this thread.

[tst]

Yeah Donald, I remembered Air's VIs were in an old version and was actually thinking of them, but I didn't try the actual links, so I just gave the link to that thread. Thanks.

[Nishant]

Mr. Srinivas,

                   Here wat u can do is just take the serial port init.vi, where you can configure the serial port specs like baud rate, com port etc, which initialises the com port, after that make the case for the modbus protocols, and in each of the case make the query for each case and after building the query  make the sequencial case structure, in first case clear the com port, in the second case calculate CRC for it, and send whole query to the com port through serial port write.vi, and in the last case take the response from the com port, which gives you the output.

I think here's wat you want, this is the concept to do it, anything else write 2 me, i ll reply to you.

Thanks,

Nishant

[Srinivas Kharsada Patnaik]

Hello Mr. Nishant,

ya I got something what you said.but I could not make out one thing.

Our purpose is to read the data from the COM port and check the redundancy.if there is no tarnsmission or communication error then just write the data in desired output port.Am I right Sir...?

but how can we do CRC check?is there any predefined method or vi...?even i dont know how to pass the query.

one more thing sir,what is the function of MBwaitForSerialRegister.vi?

Thanks