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Why Do I Get Error -32812 When I Read or Write to a cFP-180x from a cFP-2xxx?

Primary Software: Driver Software>>NI-FieldPoint
Primary Software Version: 6.0.1
Primary Software Fixed Version: N/A
Secondary Software: N/A
Hardware: Compact FieldPoint>>Controllers>>cFP-1808

Problem:
Why do I get Error -32812 when I read or write to a cFP-180x from a cFP-2xxx?

Solution:
Error -32812 can indicate many different problems in a FieldPoint VI.  If you are trying to communicate using serial, then this error can result if you do not have the right software installed.  You must have NI-Serial RT installed on the controller to communicate with a cFP-180x using serial.  If you installed the FieldPoint 6.0 (minimal) software set, NI-Serial RT is not included.  You can check to see if you have it installed by opening Measurement and Automation Explorer (MAX) and expanding the software tree for the controller.