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Chapter 4—AT Commands, S-Registers, Result Codes
connecting to another modem. For a table of valid result codes, see
Result Codes at the end of this chapter.
You can issue several commands in one line, in what is called a
command string. The command string begins with AT and ends when
you press ENTER. Spaces to separate the commands are optional; they
are ignored by the command interpreter. The most familiar command
string is the initialization string, which is used to configure the
modem when it is turned on or reset or when your communications
software calls another modem.
AT Command Summary
Command: AT Attention Code
Values: n/a
Description: The attention code precedes all command lines except
A/, A:, and escape sequences.
Command: ENTER key
Values: n/a
Description: Press ENTER (RETURN) to execute most commands.
Command: A Answer
Values: n/a
Description: Answer call before final ring.
Command: A/ Repeat Last Command
Values: n/a
Description: Repeat the last command string. Do not precede this
command with AT. Do not press ENTER to execute.
Command: Bn Communication Standard Setting
Values: n = 03, 15, 16
Default: 1 and 16
Description: B0 Select ITU-T V.22 mode when modem is at 1200 bps.
B1 Select Bell 212A when modem is at 1200 bps.
B2 Deselect V.23 reverse channel (same as B3).
B3 Deselect V.23 reverse channel (same as B2).
B15 Select V.21 when the modem is at 300 bps.
B16 Select Bell 103J when the modem is at 300 bps.