Rainbow Electronics GM862-QUAD-PY User Manual
Page 44
AT Commands Reference Guide
80000ST10025a Rev. 5 - 09/07/08
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved
page 44 of 434
&D - Data Terminal Ready (DTR) Control
SELINT 0 / 1
AT&D[
Set command controls the Module behaviour to the RS232 DTR transitions.
Parameter:
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
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
3 - device ignores DTR transitions
4 - C108/1 operation is disabled
5 - C108/1 operation is enabled; same behaviour as for
Note: if a connection has been set up issuing either #SKTD or #SKTOP,
then AT&D1 has the same effect as AT&D2.
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 as
AT&D0
Reference V25ter
&D - Data Terminal Ready (DTR) Control
SELINT 2
AT&D[
Set command controls the Module behaviour to the RS232 DTR transitions.
Parameter:
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
Note: if a connection has been set up issuing either #SKTD or #SKTOP,