Serial com with USB485 - ModBUS

[K C]

Hi Eric,

Maybe you can try to read an address and see what your slave returns.

The CRC calculation method is always the same.

Kees

[ethibault123]

Hi Kees,

I decided to try with the MODBUS library from labview because i was becoming crazy trying to write my own cmd...

Good news... I can read and write SOME registers...

I don't understant why, if you look at the register table i sent to you recently, I can do what ever I want from the list from page 72 to 85 (what they seem to call legacy parameters table).

But whenever I try to do read/write another address higher then 760 (40761), i have an illegal address error code. Any idea why?

Example: If I try to read the address 44804 (4803 from labview) I got the error.

Slowly... getting through it...

Thanks

Eric

[K C]

Hi Eric,

Had a long weekend. No computer no forums ... no NI

Now it is getting device specific. I see no reason why you cannot communicate with the mentioned addresses.

Kees

[ethibault123]

Hi Kees,

Yes, long and hot weekend (here in Canada). Warn weather is finally coming up.

Ok well thx a lot for your help, it helped me a lot.

You are good 😉

Bye,

Eric

[No_RegreTs]

Could you please convert it to 2009SP1. I can't open 2011.

[Courtney_L]

Hi Yasemin,

Which file do you need converted?

Best,

[ethibault123]

Hi

This one? Let me know if it works.

Eric

[No_RegreTs]

Hello Courtney,

 MB CRC-16.vi 11 KB

 MBcrc.vi 19 KB

and Test2.vi would be great.

[Courtney_L]

Hey Yasemin,

These should do the trick.

Best,

[No_RegreTs]

Thank you very much, they worked.