Specifications

UC864-E/G AT Commands Reference Guide

80304ST10041a Rev. 3 - 18/07/08

3.5.3.2.6 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

Reference V25ter

3.5.3.2.7 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.

3 - C108/1 operation is enabled.

4 - C108/1 operation is disabled.

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