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   tp_break() - send serial break

   tp_break(nPort, [nTime])

   nPort       Serial port number.
   nTime       BREAK time, default 0.25 second.

   Sends a serial BREAK.  A BREAK is a series of zero bits longer than a
   normal character.  Some hardware recognizes a BREAK as a "stop" or
   "interrupt" signal.  The default value for nTime is 0.25 (1/4
   second).

   If there are data buffered for output, the BREAK is sent before the
   next character.  You may wish to flush the output buffer first.
   tp_break() does not respect handshaking, and will send even if output
   has been stopped by handshaking or flow control.

   Example:

       tp_break(1, 0.125)  // Send 1/8-second BREAK.