I have recently bought a compact FieldPoint system that consist of a cFP-1804 and a cFP-DI-301. I want to talk to it from my cRIO. I downloaded the NI library "nimodbus" and read the help file "Using the cFP-180x as a Modbus Device". From the "nimodbus" library I'm using "MB Ethernet master Query.vi". In this vi there is a control that consist of five controls: "Function Code", "Starting address", "Quantity", "Data" and "Discrete". I'm using the 'Read Coil' command, and the address accepts only 4 digits, not he 5 stated in the help fiiles. So I'm using address 1001 to read the first bit on the DI-301. I did not put anything in the Data or Discrete controls. I'm not sure what to do with the MBAP header. When I run it, I get an error 63, connection refused. I am using port 502. Is there an example of reading cFP from Modbus Ethernet anywhere?

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You were the engineer.

#7174239.

Yes, I can use regular Fieldpoint vis from my PC, but can't use ethernet Modbus from anything.

-n

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