Instrument Control (GPIB, Serial, VISA, IVI)

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MODBUS ASCII RS485 for Love B thermocouple

Hi everyone.

I am trying to control the Love B thermocouple using LabVIEW and the Visa port. Currently, I only have to write for several registers, as that is what we need right now. However, when we try to control the thermocouple, the response is the same as the sent command (for both read and write). There is no error message sent back 

 

The wire is a 2-wire connection, and although we have looked online at how to connect them to Labview, we still cannot get a response. The furnace's wiring diagram is shown below: it has 1 RXD+ and 1 TXD+.

 

When we try to communicate with the furnace by other software, it also gives the same response as LabVIEW. I cannot locate where the problem is.

 

Any help would be much appreciated. 


Thank you very much.

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