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http://www.exar.com/products/st16c550v430.pdf
-CTS
Clear to Send (active low) - A logic 0 on the -CTS pin indicates the modem or data set is ready to accept transmit data from the ST16C550. Status can be tested by reading MSR bit-4.
This pin has no effect on the UART’s transmit or receive operation.
-RTS
This pin has no effect on the UART’s transmit or receive operation.
-DSR
This pin has no effect on the UART’s transmit or receive operation.
-DTR
This pin has no effect on the UART’s transmit or receive operation.
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