How do I establish a serial link to a host port?

Beverly McRae

A single USB Serial device can be used to establish a serial link to a host port on the router. The USB Serial device can also be accessed by running “serial” from an SSH session.

Telnet to Serial Configuration


  • Enabled: Enabling Telnet to Serial will start a Telnet server that passes its connection to the serial adapter. Enabling this service is not necessary when accessing serial through SSH.
  • LAN: Enable serial redirector for LAN connections.
  • Authenticated LAN: Enable serial redirector for Authenticated LAN connections. You must be logged into the router to use the redirector.
  • WAN: Enable serial redirector for WAN connections.
  • Server Port: Enter a port number for the redirector to use. (Default: 7218)

USB Serial Adapter Configuration


  • Baud Rate: Select from the dropdown list.
    • 50
    • 75
    • 110
    • 134
    • 150
    • 200
    • 300
    • 600
    • 1200
    • 1800
    • 2400
    • 4800
    • 9600
    • 19200
  • Byte Size: The number of bits in a byte. Select from: 5, 6, 7, and 8.
  • Parity: Change this value to enable parity bit checking. Select from the following dropdown options:
    • None: No parity checking. (Default)
    • Even: parity bit will always be even.
    • Odd: parity bit will always be odd.
    • Mark: parity bit will always be odd and always 1.
    • Space: parity bit will always be even and always 0.
  • Stop Bits: Number of bits to initiate the stop period. Select from these dropdown values: 1, 1.5, and 2.
  • Hardware (RTS/CTS): Use RTS (Request To Send)/CTS (Clear To Send) to enable flow control.
  • Software (XON/XOFF): Use XON/XOFF to enable flow control.
  • Linefeed: Select how you want linefeeds translated (CR = carriage return and LF = line feed).
    • Ignore
    • CR/LF
    • CR
    • LF
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