Control Commands; Entering And Executing At Commands; Escape Command - Devolo MicroLlink User Manual

8

Control commands

2 Control commands
The so-called AT command set established itself as the worldwide standard
for modem control command syntax (AT = command prefix Attention). The
MicroLink ISDN i also operates with the AT command set, permitting users
of data communications equipment to continue using a familiar command set
for ISDN communications. A terminal program is required to enter AT com-
mands via a PC.
The complete AT command set can be found in the chapter 'AT commands:
Detailed description'.
2.1

Entering and executing AT commands

After switching on, the ISDN modem is in the command phase. Commands
can only be accepted, interpreted and executed in this phase.
In the event that several commands are to be sent to the ISDN modem, these
may be entered individually, each with an AT command prefix and a conclud-
ing M. It is also possible, however, to enter these commands consecu-
tively in a single command line after an introductory AT and to conclude the
line with an M.
The individual commands may be separated by spaces to improve the over-
view. No further characters may be entered once the end of the command
line buffer has been reached. The command line can then only be edited with
R (backspace) or executed with M.
2.1.1

Escape command

The characters S-x and S-c may be used to abort the execution of
a command line or a screen display (e.g. when returning the contents of the
registers with AT%R).
Commands that must be specified with a parameter may also be entered
without a parameter. The absence of a parameter corresponds to the param-
eter 0 (e.g. ATI = ATI0).
After the successful establishment of a connection to the remote station, the
ISDN modem switches from the command phase to the transfer phase.
Transfer phase means that a connection to a remote data station (i.e. to
another ISDN modem) exists: the ISDN modem is online. This is the case
after successful call establishment (outgoing call), as well as after answering
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