$FUNCNAME$
	COM_NUM()
$CATEGORY$
  Serial I/O
$SUMMARY$
	Return the number of the highest available serial interface port
$LANG_RU$
	 -  COM-.
$SYNTAX$
	COM_NUM() --> nMaxCom
$ARGUMENTS$
$RETURNS$
	Return the number of the highest available serial interface port
$LANG_RU$
	 -  COM-.
$DESCRIPTION$
	This function returns the number of the serial interface port
	available. This is not to say that a return value of 3 necessarily means
	that ports 1 through 3 are available; for example, COM2 could be
	missing. Whether or not a serial port can actually be used can be tested
	using the COM_OPEN() or COM_INIT() functions.
$LANG_RU$
	      
	  . ,     .
	,    3,  COM2    
	.      COM_OPEN()
	 COM_INIT().
$EXAMPLES$
	? COM_NUM()                 // e.g. 4
$LANG_RU$
$PECULIARITIES$
$LANG_RU$
$PLATFORMS$
   No dependies of platform.
   $LANG_RU$
      
$SEEALSO$
	COM_DTR(),COM_RTS(),COM_SOFT(),COM_TIMEOUT(),COM_HARD(),COM_COUNT()
$AUTHOR$
ITK,Paul
$END$
