Airlink AML001 - Manual (Page 30)

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Appendix A AT Commands
AT Command Set
AT commands are issued to the modem to control the modem’s operation
and software configuration. The basic command syntax is as follows:
<command><parameter>
The <command> is a combination of the attention prefix (AT) followed by
the AT command. The <parameter> is a string which represents a numeric
decimal value.
Note: If a parameter value is not entered then the soft modem assumes a
parameter value of zero.
Any command issued is acknowledged with a response in either text or
numeric values. These responses are known as result codes.
AT commands can only be entered while the modem is in command mode.
Command mode is entered under one of the following conditions:
!
After powerup, at the termination of a connection, or after the
execution of a command other than dial or answer.
!
Upon the receipt of the escape sequence (three consecutive characters
matching the contents of register S2) while in on-line mode.
!
Upon the on-to-off transition of DTR if &D1, &D2, or &D3 has been
set.
A.1 AT Commands
A.1.1 Data and General Commands
+++Escape Sequence
An escape sequence allows the modem to exit data mode and enter on-line
command mode. While in on-line command mode, AT commands are sent
directly to the modem. Use the return to on-line data mode command (see
O<value>—Return to On-Line Data Mode) to return to data mode.
Place a pause before and after the escape sequence to prevent the modem
from interpreting the escape sequence as data. The length of the pause is set