Basic Command Interface
The modem may be used in one of five modes:
- Smart AT, switched
- Smart V.25bis, switched
- Smart AT, leased line
- Dumb, switched
- Dumb, leased line
All command descriptions apply to the smart modes.
When the modem is idle or in Online Command states (smart AT mode), the
modem accepts and executes AT commands from the DTE. The modem may also
send un-solicited result codes, such as RING and NO CARRIER. (See the section
on V.25bis features for details of the smart
V.25bis mode).
While the modem is in smart AT mode and the Online state, it can go to the
online command state by the Hayes Improved Escape Sequence with Guard Time,
and sometimes to the idle or online command state by a DTR signal (depending
on &Dn). For more information, click on one
of the following topics:
DTE Interface Speeds
Character Formats
Command Processing
Information Text
Result Codes
Execution Time
Assumed Zero Suffixes
Out-of-Range Suffixes
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