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   tp_flowon() - override received XOFF

   tp_flowon(nPort)

   nPort       Serial port number.

   If XON/XOFF flow control has been enabled by tp_hshk(), output will
   stop whenever the port receives an XOFF character.  Normally, this
   will only pause the output until it receives an XON.  It is possible
   that a communication failure (such as loss of carrier on a modem)
   could prevent output from resuming.  In that case, tp_flowon() can be
   used to override the XOFF and allow output to continue.

       tp_flowon(1)        // Restart port 1 output.