Extended AT Commands Manual Page 57 of 70 2009-06-25
Parameter Description
Packet
Data
STU-
III
&C1
Circuit 109 (CF) ON in accordance with the specified
service. DCD line is High during a circuit switched call.
R N/A
&C2
Circuit 109 (CF) ON. DCD is always high. This line toggles
low for 1 second when the circuit switched call is
disconnected.
R N/A
&C3
Circuit 109 (CF) ON. DCD is Low. High when modem has
successfully established a PPP Data (packet switched) call
(only applies to IP STACK)
R N/A
&C4
Circuit 109 (CF) ON. DCD is Low. High when modem has
successfully established a PPP Data and opened a socket
with remote server(packet switched) call (only applies to
IP STACK)
R N/A
&D0 Ignore circuit 108/2 (CD). R N/A
[&D1]
Enter online command state following ON-to-OFF transition
of circuit 108/2. See service specific AT command processing
for service state transitions.
R N/A
&D2
Enter command state following On to Off transition of
circuit 108/2. See service specific AT command
processing for service state processing requirements.
R N/A
T Select tone dialling. N/A N/A
&F0
Set to factory-defined configuration. Effect is
implementation dependent.
O N/A
12.2.2. Basic S registers
The following table specifies the basic S registers to be supported for the data services. Exceptions
to EIA/TIA-602 are indicated by square brackets. Default settings are shown in bold.
Table 12.79 Basic S-registers
Register Value Description
Packet
Data
STU-
III
S0
[1 to 255]
0
Automatic answering. [Enable automatic
answering after (Value: 1) x 6 seconds.]
0: Not Answer
N/A N/A
S3 13 Carriage Return character. O N/A
S4 10 Line Feed character. O N/A
S5 8 Backspace character. O N/A
S6
2 to 10
2
Pause before blind dialling. N/A N/A
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