Modbus Sniffing with PC

[luca_l]

hi
I'm studying about Modbus.
I would like to see on a PC the data from a pic
with Modbus (programmed with CCS)
 
I  tried with the file suggested by Trump: 
http://rapidshare.com/files/77291978/Modbus.rar.html

and some other:
http://www.modbus.pl/MTester.htm
http://www.modbustools.com/

  in all the cases I can't read the  data. 

obviously the configuration's parameters are identical
on both devices, PC and Pic


thanks  for every help

Luca

[ucanturk]

Luca,
Try with this master software for Modbus RTU.
http://mihd.net/ohfnyp

No need to install, just copy into a folder and use. Enjoy!

[anhdt]

You can use DAQFactory to test your devices, DAQFactory (Modbus Scanner) is free, and very powerful, this is link:
http://www.azeotech.com/index.php?_m=downloads&_a=viewdownload&downloaditemid=27&nav=0&gclid=CNSa563N9JACFRcjewodjCcNsA

[luca_l]

thank you very much for your help!

After various test done with all software, and using different firmware on pic

only http://mihd.net/ohfnyp  works correctly! 

all configurations are identical

  I don't understand the cause for that. 

Luca

[anhdt]

Maybe, you do something Wrong, DAQFactory is a very cool and Powerful for testing modbus devices, DAQ is industrial standard

[luca_l]

dear Anhdt

Probably you are  right! 

I think that all depends what says modbus.c
but my doubt:
  Is it  possible to find various modbus dialects?? 

cheers
Luca

[strolch]

I think there are two Modbus-Dialects.

ASCII and RTU

Don't use ASCII

In the CSS-Forum Neutone has made a fine Modbus-Software

Michael

Posted on: January 29, 2008, 04:32:25 16:32 - Automerged
I use the Tools from modbustools.com. They are fine. You see everything with this software!

[yangzy]

On this site You can find modbus program  examples
http://www.modbus.pl