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Chapter 4
AT Commands
This chapter describes the basic modem commands in alphabetical order.
Some commands have factory default settings, for which you can refer to
your Getting Started manual Command Summary table.
4.1 Prefix, Repeat and Escape Commands
AT Attention. Precede all command lines except A/ and +++
A/ Re-execute the last command in command buffer
+++ Escape characters, requires guard time before and after
4.2 Dial Commands and Dial Modifiers
D Originate a call
S=n Dial the n
th
stored number
T Touch tone dialing
P Pulse dialing
R Dial in answer mode
W Wait for second dial tone
L Re-Dial the last valid
telephone number
, Pause
! Flash
; Return to command state
4.3 Operation Commands
A Answer incoming call
B0 CCITT or ITU-T compatibility
B1 Bell protocol only
E0 Disable command echo
E1 Enable echo command
characters
H0 Hang up the connection (on-
hook)
H1 Go off-hook to make a call
I0 Reports product code
I1 Calculates the ROM
checksum
I3 Reports firmware version
L0 Low volume
L1 Low volume
L2 Medium volume
L3 High volume
M0 Speaker off at all times
M1 Speaker on until CD
detected
M2 Speaker always on
N0 Fixed data rate follow *N
command
N1 Enable adaptive data rate
O0 Return to data-link without
retrain
O1 Return to data-link with
retrain
Q0 Modem sends response
codes
Q1 Do not send response codes
Sr? Display the value in register
Sr=n Set register r to a value n
V0 Display response codes in
digit form
V1 Display response codes in
words
W0 Disable V.42 response codes,