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   tp_ctrlrts() - get or set RTS handshake setting

   nOldCtrl := tp_ctrlrts(nPort, [nNewCtrl])

   nPort       Serial port number.
   nNewCtrl    New RTS control setting.

   Returns     Original RTS control setting.

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

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

   If nNewCtrl is omitted, tp_ctrlrts() 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_ctrlrts(1, 2)    // Enable RTS handshaking on port 1.