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 Branches to the specified routine when characters are received at a
 communications port; can be used with object-specific events.
 
    ON COM(n%) GOSUB {linenumber | linelabel}
 
    ■ n%              Number of a COM (serial) port (1 or 2)
 
    ■ linenumber      First line of an event-handling routine to execute
      linelabel       when characters are received at a communications
                      port
 
 See Also
    ◄COM Statement►                    ◄Error/Event Trapping Summary►
    ◄Object Events Summary►            ◄PRINTER Object►