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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