User's Manual

AT Command Set Summaries 17
4 AT Command Set Summaries
Basic AT Command Set
Command Options Function & Description
A/ Re-execute the last command once
<any key> Terminate current connection attempt when enter in handshaking state.
+++ Escape sequence code, entered in data state, wait for modem to return to
command state.
All the Following Commands Require a “ AT” Prefix
A Go on-line in answer mode. (See also S39.2, S43.6)
Bn Handshake option
B0 * Select CCITT V.22 for 1200 bps
B1 Select Bell 212A for 1200 bps communication
Ds
Dial s (numbers and options) that follow (see also S38.0, S35.4). The
options of s are listed as follows:
0-9, #, * Digits for dialing
P Pulse dialing
T Ton dialing
, Pause for a time specified in S8. Remaining digits will be dialed as in-band
DTMF.
; Return to command state after dialing
! Hook flash
@ Wait for a 5 second silence before proceeding
R Reverse handshake (go on-line in Answer mode)
W Wait for second dial tone. Remaining digits will be dialed as in-band DTMF
DL Repeat last ATD command
DSn
n=0-3 Dial number stored in non-volatile RAM at location 'n'
En
Command mode local echo of keyboard commands
E0 Echo off
E1 * Echo on
Hn
On/off hook control
H0 * Hang up (on-hook) the modem or ISDN, same as 'ATH'
H1 Off hook the modem
In
Display inquired information
I0 Display numerical product code, same as 'ATI'
I1 Display product information and ROM checksum
Mn
Speaker control
M0 Speaker always OFF
M1 * Speaker OFF during dialing
M2 Speaker always ON
M3 Speaker ON until CD is detected
O0 Return to on-line state
O1 Return to on-line state with forced retrain
Qn
Result code displayed
Q0 * Modem returns result code
Q1 Modem does not return result code
Q2 Modem returns result code but quiet after answering on a RING.
Sr=n
Set S-register 'r' to value 'n'. 'n' must be a decimal number between 0 and 255