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Modbus query

Modbus query

‎07-27-2009 01:24 AM

Hi.

i am facing a problem in Labview  VISA serial. I am getting a write holding register query from a standard modbus master tool. The issue is that the query string is around 32bytes of data. i am not able to capture the entire data on the modbus Slave created from the Standard library provided by NI... can you please sugggest a method by which i might be able to grab the entire query using VISA. (the query is 32 bytes wide) 

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Re: Modbus query

‎07-27-2009 09:36 AM - edited ‎07-27-2009 09:40 AM

Are you getting some kind of error message?  If so, which one, which error code?

 

What is the "standard modbus master tool" you using?

 

Are you using the slave Daemon on your LabVIEW computer as well as the MB Slave example?

 

Are you sure the device you are communicating with isn't the slave and that you should be using MB Master example on your PC?

Message Edited by Ravens Fan on 07-27-2009 10:40 AM
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