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AT commands: Detailed description
17
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devolo MicroLink ISDN i
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EN
stored in the first location (see
AT\P
or
AT&Z
commands). If no number has
been stored, the MicroLink ISDN i returns ERROR.
&D
Effect of DTR
AT&D0
: Ignore transition of DTR status
AT&D1
: Switch to command phase if DTR -> OFF
*AT&D2
: Abort connection if DTR -> OFF
AT&D3
: Abort connection and reinitialize
if DTR -> OFF
These commands are used to set the response of the MicroLink ISDN i to a
transition of the control line DTR from ON to OFF.
With the setting
AT&D0
, the MicroLink ISDN i ignores the DTR transition
from ON to OFF.
With
AT&D1
, the transition of the DTR control line from ON to OFF has the
following effects: If the MicroLink ISDN i is in the command phase, the tran-
sition has no effect. During the establishment of a connection, the ON to OFF
DTR transition aborts the connection. If the MicroLink ISDN i is in the trans-
mission phase (i.e. with an existing connection), it will switch to the com-
mand phase.
With
AT&D2
, the transition of the DTR control line from ON to OFF has the
following effects: If the MicroLink ISDN i is in the command phase, the tran-
sition has no effect. During the establishment of a connection, the ON to OFF
DTR transition aborts the connection. If the MicroLink ISDN i is in the trans-
mission phase (i.e. with an existing connection), it will abort the connection
and switch to the command phase.
With
AT&D3
the MicroLink ISDN i's response is the same as with
AT&D2
.
In addition, the MicroLink ISDN i is reinitialized by the DTR transition from ON
to OFF (see also
ATZ
and
AT&Y
).
With
AT&D2
and
AT&D3
as well as DTR = OFF, the MicroLink ISDN i does
not return a RING for incoming calls. Automatic call answering is not possi-
ble until after the DTR transition from OFF to ON. A RING message with sub-
Summary of Contents for MicroLlink
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