Appendix A. Changing COM220 Settings

FIGURE A-3. Terminal Emulator Screen in Device Configuration

HAYES AT COMMAND SUMMARY:

This manual does not attempt to be a primer on the Hayes AT command set. The commands are, therefore, only summarized below. For most applications, these commands will not need to be used. Except as noted, all commands should begin with an “AT” and end with a carriage return (hit the [Enter] key). There are no “O” as in Oscar commands, only “0” as in Zero commands. For example, to change the default number of rings from 1 to 3, the command is: ATS0=2 (the default is 1 ring as the MPU sends ATS0=1 by default to the modem module).

To turn the speaker off, the command is: ATM0

Note, for command changes to be effective, you MUST hit enter after typing the command and you MUST hit 5 to save the new command before disconnecting or exiting set up.

COMMANDS TO CHANGE DEFAULT MODES:

B1 (default)

CCITT V.32

(9600 baud), Bell 212A (1200 baud), and Bell

 

103 (300 baud)

B0

CCITT V.32

(9600 baud), CCITT V.22 (1200 baud), and

 

CCITT V.21

(300 baud)

L0

Lowest speaker volume

L1 (default)

Low speaker volume

L2

Medium speaker volume

L3

High speaker volume

A-5