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Note, that HIGH/LOW states specified above are for the TTL-serial interface of the MODULE-level products. If you are dealing with the RS232 port then the states will be in reverse (for example, 1- PL_SER_SI_HIGHFORINPUT will mean "RTS LOW for input, HIGH for output").
Depending on your platform, you may be allowed to remap RTS line to other I/O pins of the device through the ser.rtsmap and ser.ctsmap properties. Also, you may be required to configure RTS line as an input through the io.enabled property of the io object. For more information, refer to your device's platform documentation (for example, EM1000's is here).
When the serial port is in the UART/half-duplex mode you can use the CTS line as a regular I/O line of your device.