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   tp_ctrldcd() - get or set DCD handshake setting

   nOldCtrl := tp_ctrldcd(nPort, [nNewCtrl])

   nPort       Serial port number.
   nNewCtrl    New DCD control setting.

   Returns     Original DCD control setting.

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

       0   Ignore DCD.
       1   Require DCD to input or output characters or write to the
           output buffer.

   If nNewCtrl is omitted, tp_ctrldcd() 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 0.

   Example:

       tp_ctrldcd(1, 1)    // Enable DCD handshake on port 1.