Reading the words of temperature controller fits using Modbus

I'm working on a project that involves the use of a certain number of temperature controllers, Omega CN 7823 s.  The Protocol of communication for them is RS485 Modbus ASCII or RTU.

I had a bit of trouble getting a job of communicating.  I think I do everything correctly in terms of setting up the initial communication parameters (baud rate, parity, etc.), but have been unable to properly read the values.  I am able to write values to operating records, but cannot read them.  When I try to read (using the code 03), the result is simply a multiple of 256 (if I try to read registry 1001 H, which is 4097 in decimal form, I get a result of 256).

I'm running in ASCII at a speed of 9600, 7-bit data length, parity and 1 stop bit.

Any help would be appreciated - I am attaching my VI and the manual of the controller.

In the end it turned out that I had to create a property node to the VISA Instrument and specify the mode series RS-485/2-Auto.  This allowed the computer read the response from the controllers of temperature instead of simply reading the message that was sent to them.  I wish I had discovered this day 1, 2 or 3 to work on this problem, instead of the day 5.

Tags: NI Software

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