# Appendix E. Using the Serial Interface

For those who wish to use the serial port, the input or output path of a program may be redirected to the serial port of your computer.

This is done by including the following module in the OS-9 kernel:

ACIA51 - Serial Device Driver

To load this module into the kernel enter the following command line:

    LOAD /D0/CMDS/ACIA51

## Serial Printer Implementation

For those with a serial printer, you can use the serial port in the redirection of a program's output path by including the following modifier at the end of a command line:

    >/P1

The baud rate of the serial port may be changed as follows:

    XMODE /P1 BAUD=3

This will change the baud rate to 1200 characters per second. For a detailed description of the baud rate see the XMODE command description.