Specifications

HE863 family AT commands reference guide

80377ST10083a Rev.4 – 2012-02-01

+ICF - DTE-Modem Character Framing

Reference V25ter

Example

AT+ICF = 3 - 8N1 (default)

AT+ICF=?

+ICF: (3)

3.5.2.2.7. Data Carrier Detect (DCD) Control - &C

&C - Data Carrier Detect (DCD) Control

AT&C[<n>]

Set command controls the RS232 DCD output behaviour.

Parameter:

<n>

0 - DCD remains high always.

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

3.5.2.2.8. 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

3.5.2.2.9. Data Set Ready (DSR) Control - &S

&S - Data Set Ready (DSR) Control