Use the pull-down menu to select an instance of this VI. ![]() Wire data to the VISA resource name input to determine the polymorphic instance to use or manually select the instance. Initializes the serial port specified by VISA resource name to the specified settings. Owning Palette: Serial VIs and Functions. I had an application that would stop reading from the serial port (I’d get a timeout, not a ‘freeze’, but I reduced the default timeout time) that was fixed by switching from asynchronous to synchronous, or vice versa. LabVIEW RS232 Serial Read Write Application Com Port Freeze Up / Stuck Sign in to follow this. In the LabVIEW libraries, this is represented by a while loop which continuously queries the slave for the Discrete Inputs, Coils, Input Registers and Holding Registers. Figure 12: VISA Open and Configure Session to Serial Port As explained in the previous paragraphs, the master (client) usually queries the slave (server) for some data. Step 10: Use the “Configure Port” function to set the baud rate and data format values depending on the serial COM Port of your device. ![]() ![]() Step 9: Select the “Configure Port” function from the “Serial” menu. Step 8: In the Functions Palette, select the “Serial” item from the “Instrument I/O” menu.
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