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Serial_Close (function reference)

By July 1, 2023July 17th, 2023Online Help, Troi Serial Plug-in
Troi Serial Plug-in for FileMaker Pro


Closes a serial port with the specified name.

SyntaxFunction badge

Serial_Close ( switches ; portname )


switches not used, reserved for future use. Leave blank or put "-Unused"
portname the name of the port to close

Returned Result

Data type returned

Error code


The returned result is an error code. Returned error codes can be:

0 no error the port was closed
$$-4210 portDoesNotExistErr port is not available on this computer
$$-4211 AllPortsNullErr no serial ports are available on this computer
$$-108 memFullErr ran out of memory

Other errors may be returned.

Originated in

Troi Serial Plug-in 3.0


FileMaker Pro 16 to FileMaker Pro 2023


If the portname parameter is “” all ports are closed.


This will close the COM3 port:

Set Field [ gErrorCode ; Serial_Close ( "-Unused" ; "COM3" ) ]

Example 2

This will close all open ports:

Set Field [ gErrorCode ; Serial_Close ( "-Unused" ; "" ) ]

Used in example files


Related functionFunction badge


Related script stepScript step badge

Close Serial Port

Related topics

Troi Serial Plug-in online help (overview)

Online Help Page for Troi Serial Plug-in for 16 to 2023 –> Serial_Close (serip4800) 2023-0717 12:45:45