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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
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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
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ble until after the DTR transition from OFF to ON. A RING message with sub-
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