HE863 family AT commands reference guide
80377ST10083a Rev.6 – 2012-11-12
Reproduction forbidden without written authorization from Telit Communications S.p.A.- All Rights Reserved.
Page 40 of 229
&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
Note: Current value is returned by AT&V
Reference V25ter
3.5.2.2.9.
Data Terminal Ready (DTR) Control - &D
&D - Data Terminal Ready (DTR) Control
AT&D[<n>]
Set command controls the Module behaviour to the RS232
DTR
transitions.
Parameter:
<n>
0 -
DTR
transitions are ignored. (factory default)
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.
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 of
AT&D0
Reference V25ter
3.5.2.2.10.
Flow Control - &K
&K Flow Control
AT\K[<n>]
Set command controls the RS232 flow control behaviour
Parameter:
<n>
0 - no flow control
1 - hardware mono-directional flow control (only
CTS
active)
2 - software mono-directional flow control (
XON/XOFF
)
3 - hardware bi-directional flow control (both
RTS/CTS
active) (factory default)
4 - software bi-directional with filtering (
XON/XOFF
)
5 - pass through: software bi-directional without filtering (
XON/XOFF
)
6 - both hardware bi-directional flow control (both
RTS/CTS
active) and software
bi-directional flow control (
XON/XOFF
) with filtering
Note:
Set command has no effect is included only for backward compatibility