COM
===

Function
--------

**COM** activates or deactivates the communications interrupt routine.

Syntax
------

| COM ON
| COM OFF
| COM STOP

These statements must be initialised with an :doc:`on-com` statement.

Example
-------

::

   10 ON COM GOSUB 1000
   20 COM ON
   1000 REM TRAP ROUTINE
   1010 LINPUT A$ ...
   1990 RETURN

Remarks
-------

These statements decide what action is taken on receiving
communications. The interrupt occurs on the first character.

COM ON
   When executed, allows trapping of communications by the ON COM
   statement. If the previous state was COM OFF then the buffer is
   cleared by this statement.
COM OFF
   The trapping is deactivated and all communications interrupts are
   ignored.
COM STOP
   Communications interrupts are noted but not acted upon by the ON COM
   statement until a COM ON is executed.