Specifications

AT Commands and Result Codes
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APPENDIX A
AT Commands and Result Codes
This appendix describes the following:
• AT commands
• Error correction commands
• Caller ID commands
• S-Register summary
• Result codes
You can use AT commands to control the analogue V.90 modem. You can enter these
commands in your communication software’s terminal mode. To restore the Factory default
settings, reboot your computer.
Note: Options you must specify are indicated by <n> or <x>.
AT commands
Command Function Default
+++ Escape - Switches the modem from data mode to command mode. —
A/ Repeats the previous command. —
AT A Answer - Accepts an incoming call that was indicated by a RING. —
AT B<n> Selects Bell or CCITT protocol for low-speed connections.
n=0: Selects CCITT protocol.
n=1: Selects Bell protocol (common in United States).
n=1
AT D<number> Dial - Dials the number and switches to data mode after the connection is
successfully established.
—
AT E<n> Echo Mode - In echo mode, all commands sent to the modem are echoed back to
the terminal.
n=1: Sets Echo Mode to ON.
n=0: Sets Echo Mode to OFF.
n=1
AT H<n> On/off-hook - Causes the modem to hang up or pick up.
n=0: Goes on hook (hang up).
n=1: Goes off hook (pick up).
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