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4-13830-A2-GB91-30 August 1998
AT Command Set and
S-Registers
Overview 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Modes 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Switching Between Data Mode and Online Command Mode 4-2. . . . . . . . .
Escape Sequence and Escape Guard Time 4-2. . . . . . . . . . . . . . . . . . . . . .
Command Guidelines 4-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Result Codes 4-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
AT Command List 4-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
S-Register List 4-30. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Overview
This chapter discusses guidelines necessary to operate AT commands
as well as listing all AT commands supported by the Model 3830
modems. AT commands are issued from asynchronous DTEs.
Operating Modes
The Model 3830 modem has two operating modes: Command mode
and Data mode. Before a modem goes online (establishes a successful
connection with a remote modem), it is in Command mode, an idle
state where you can modify its operating parameters or issue modem
commands. (Any command issued is acknowledged with a response in
either words or digits known as result codes. Refer to Table 4-1 for a
listing of result codes.)
Once the modems are online, either by answering or originating a call,
they automatically switch to Data mode. Data mode is a state where
any entries made from the DTE are considered data and are transmitted
and received between modems. The modems remain in Data mode until
the connection is broken or until they are forced into online Command
mode using the escape sequence (+ + +).
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