Modbus and Protocol 3

[ncm]

I have a Despatch oven that is using Protocol 3 which communicates using Modbus over RS485. I am using the Modbus library that I found though the forum and am still having troubles communicating with the controller. I am using a USB RS485 converter and my converter is set to half duplex 2 wire without echo. I am able to transmit but not receive a message back from the oven. Does anyone have any experience or any insight on how to work LabVIEW with this equipment?

[WenR]

Hi ncm

Could you please share a diagram of the wiring that you used for the half duplex connection? 

Do you have further information about the oven (a manual for example? If you could post screenshots of the code that you use would be useful as well. I wonder if there is any configuration that needs to be done to allow reading values from the oven. 

WenR

[ncm · Accepted solution]

Thank you for your response, we found the issue and the oven came to us wired backwards, that is why we couldn't communicate.  We are communicating now 🙂

[WenR]

Thank you very much for letting us know! You can mark your own answer as the solution of the forum 

Have a good day!