With older computers and programs that the modem may need to be configured manually. The below chart lists all the settings that the DB9 serial port.

By default, your computer would use:

Baud Rate: 9600, Data Bits: 8, Stop Bits: 1, Parity: None, Flow Control: XON/XOFF.

To set values from an MS-DOS prompt, you can use the mode command. We have listed a few examples to give you a general idea how to use this command.

MODE COM1:9600,N,8,1,P - This command would set Communications port COM1 to 9600 Baud, with no parity, 8 data bits, 1 stop bit, and with XON/XOFF (these are the default settings).

If you are using Windows 95, Windows 98, Windows ME, Windows NT, Windows 2000, Windows XP, or a newer version of Windows, do not configure your COM port manually. Instead, configure it using the Windows Device Manager.

  • Basic Hayes modem AT strings.
  • See our baud, mode, and modem definitions for further information and related links.
  • Modem help and support.