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   tp_ctrldtr() - get or set DTR handshake setting

   nOldCtrl := tp_ctrldtr(nPort, [nNewCtrl])

   nPort       Serial port number.
   nNewCtrl    New DTR control setting.

   Returns     Original DTR control setting.

   Gets or sets the DTR handshake setting.  This setting may be one of:

       0   Turn DTR off.
       1   Turn DTR on.
       2   Turn DTR on normally, off when the input buffer fills up to
           the high-water mark.

   If nNewCtrl is omitted, tp_ctrldtr() just returns the current
   setting.  If nNewCtrl is specified, it changes the setting and
   returns the original value.

   The default setting when a port is opened is 1.

   Example:

       tp_ctrldtr(1, 0)    // Turn DTR off...
       tp_delay(1)         // ...wait one second...
       tp_ctrldtr(1, 1)    // ...and turn it back on.