Telit LE910 V2 Series AT Commands
80446ST10707A Rev. 0– 2015-11-03
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 40 of 509
Mod. 0808 2011-07 Rev.2
&C - Data Carrier Detect (DCD) Control
1 - DCD follows the Carrier detect status: if carrier is detected DCD is high,
otherwise DCD is low. (factory default)
2 - DCD off while disconnecting
Note: if parameter is omitted, the command has the same behaviour of AT&C0
Data Terminal Ready (DTR) Control - &D
&D - Data Terminal Ready (DTR) Control
Set command controls the Module behaviour to the RS232 DTR transitions.
Parameter:
<n>
0 - device ignores DTR transitions (factory default); if +CVHU current setting is
different from 2 then every setting AT&D0 is equivalent to AT&D5
1 - when the MODULE is connected, the High to Low transition of DTR pin sets
the device in command mode, the current connection is NOT closed; if +CVHU
current setting is different from 2 then issuing AT&D1 is equivalent to
AT&D5
2 - when the MODULE is connected , the High to Low transition of DTR pin sets
the device in command mode and the current connection is closed; if +CVHU
current setting is different from 2 then issuing AT&D2 is equivalent to
AT&D5
3 - device ignores DTR transitions; if +CVHU current setting is different from 2
then issuing AT&D3 is equivalent to AT&D5
4 - C108/1 operation is disabled; if +CVHU current setting is different from 2
then issuing AT&D4 is equivalent to AT&D5
5 - C108/1 operation is enabled; same behaviour as for <n>=2
Note: if a connection has been set up issuing either #SKTD or #SKTOP, then
AT&D1 has the same effect as AT&D2. If a connection has been set up issuing
AT#SD then AT&D1 and AT&D2 have different effect, as described above.
Note: if AT&D2 has been issued and the DTR has been tied Low, autoanswering is
inhibited and it is possible to answer only issuing command ATA.
Note: if parameter is omitted, the command has the same behaviour of AT&D0
Note: if AT&D2 has been issued the call is drop on falling DTR edge and NO
CARRIER exits on rising DTR edge.
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