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Two Applications Simultaneously Communicating With a Serial FieldPoint Controller

Hardware: Compact FieldPoint

Problem: Is it possible to have two separate applications simultaneously access a FieldPoint controller through the same serial port?

Solution: No.  Since a COM port in a PC is a shared resource only one application can access a given COM port at a time, so multiple applications cannot access a serial based FieldPoint controller at the same time.

However, two VIs can access the same serial based FieldPoint controller at the same time because the VIs are both running under a single application instance of LabVIEW.  This will not work if you run two LabVIEW built executables that try to access the same serial based FieldPoint controller at the same time because each executable creates its own LabVIEW application instance when run.  Trying to do so will result in a resource conflict error.

Related Links: KnowledgeBase 32KEHPP6:  Can Multiple Applications Access FieldPoint Simultaneously?

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Report Date: 08/04/2007
Last Updated: 08/21/2007
Document ID: 4C3EMB2F

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