Connecting to the Console Port

There are times when directly accessing the console is required. Perhaps webGUI or SSH access has been locked out, or the password has been lost or forgotten.

A null modem cable is a 9 pin D-Shell connector serial cable where the transmit pin on one end connected to the receive pin on the other. You can make your own or purchase them inexpensively. A null modem cable pinout is shown here. USB to serial adapters can be used on systems that don’t have a standard 9-pin DB-9 serial port.


Use a terminal program to connect to the system console port. PuTTY is a popular terminal program that is available on various operating systems. Some other choices of terminal programs:

  • Linux - minicom, dterm, screen

  • Mac OS X - cu, screen, ZTerm


Windows HyperTerminal should be avoided if possible.

The settings to use within the terminal program are:

  • Speed: 115200 baud

  • Data bits: 8

  • Parity: none

  • Stop bits: 1

  • Flow Control: Off or XON/OFF. Hardware flow control (RTS/CTS) must be disabled