Serial interface configuration commands

config 
    - [no] port port-id
        - serial
            -  rs232 
                - character-length {6 | 7 | 8}
                - control-lead {input | output}
                    - input
                        - dtr-dsr {high | low}
                        - rts-dcd {high | low}
                    - monitor
                        - dtr-dsr off
                        - rts-dcd off
                    - output
                        - cts-alb {high | low}
                        - dcd-rts {high | low}
                        - ri-rdl {high | low}
                - hold-time {[up hold-time-up] [down hold-time-down]}
                - no hold-time
                - loopback bidir-e
                - no loopback
                - parity {odd | even | mark | space}
                - no parity
                - [no] shutdown
                - speed {600 | 1200 | 2400 | 4800 | 9600 | 19200 | 38400 | 
57600 | 115200}
                - stop-bits {1 | 2}