I have a problem and need help understanding modbus. I have received the following from our vendor and I have to write a Modbus VI to communicate to the equipment. Function Parameter Value Modbus Address Input / Output Start #18.31 1 41831 Input Stop #18.31 0 41831 Input Direction #6.33 0 = Fwd, 1 = Rev 40633 Input I do have NI Modbus.llb that i have downloaded from NI website. My problem is, how do I use the above values and convert into the data units for modbus. For e.g., Parameter #18.31 means what for modbus and where do I pass into?. Same with the value and modbus address. When I look into the NIModbus vis, there ar different terms like function code, starting address, quantity and data. Please help.. Thanks,

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Thanks, I will look and try that. I just didn't want to fight addressing problems when I might have wiring problems. I will let you know tomorrow.

And yes it looks like that Omega controller is the same Love controller. The manual is identical.

Message Edited by doug@southerndaqsolutions.com on 11-18-2008 01:45 PM

Doug Ferguson

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