'''This page is maintained for historic purposes. The keyword is not supported in QB64.'''

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[[ON COM(n)]] branches to a line number or label when there is a value in the serial port specified.



{{PageSyntax|}}
:[[ON COM(n)]] [[GOSUB]] {''linenumber''|''label''}


{{PageDescription}}
*'''[[Keywords currently not supported by QB64|Not implemented in QB64]]'''
* ''n'' can be 1 or 2 (the number of the serial port that is tested).
* If a value exists in the port then the program branches to the ''linenumber'' or ''label'' specified.
* The event handler must first be activated with [[COM|COM(n) ON]]


{{PageSeeAlso}} 

* [[COM(n)]]
* [[OPEN COM]]
* [[Port Access Libraries]] {{text|(COM or LPT registers)}}
* [[Windows_Libraries#Windows_Ports|Enumerating Windows Ports]]


{{PageNavigation}}