Schweitzer Engineering Laboratories, Inc.
SEL-9192 Data Sheet
5
Table 1
AT Commands (Sheet 1 of 2)
Command
Description
A/
Repeat the previous
AT
command
A
Answer
B
n
Select CCITT or Bell standard
B0
CCITT operation at 300 or 1200 bps
B1
Bell operation at 300 or 1200 bps (default)
D
Dial
0–9
Dial DTMF digits 0 to 9.
A–D
Dial DTMF digits A, B, C, and D.
P
Select pulse dialing; affects current and subsequent dialing.
T
Select tone dialing; affects current and subsequent dialing.
!
Flash—go on-hook for a time defined by S29.
S=
r
Dial stored number
r
(see &Z for storing numbers).
W
Wait for dial tone detection before dialing the next digit. If no dial tone is detected within the time specified by S7, the
modem aborts the rest of the sequence, goes on-hook, and generates an error message.
@
Wait for 5 seconds of silence before proceeding with next dialing string and then complete handshake sequence.
,
Pause—the modem pauses for a time specified by S8 before dialing the following digits. Most often used when dialing an
outside line through a PBX.
;
Return to command mode after processing command.
^
Disable calling tone transmission; applicable to current dial attempt only.
Example of the
Dial
command:
ATDT767-8900
Meaning “ATtention Dial using Touch-tone the numbers 767–8900”
E
n
Command echo
E0
Disables command echo.
E1
Enables command echo (default).
H
n
Disconnect (hang up)
H0
Hang up (default)
H1
Go off-hook
I
n
Modem identification
I0
Reports product code (either 33600 or 56000).
I1
Reports 255 if the prestored checksum value is FFh.
I2
Reports OK (for software compatibility).
I3
Reports the firmware version of the modem—Example: 3.xxx-V90_2M_DLS.
L
n
Speaker volume
L0
Off or low volume
L1
Low volume (default)
L2
Medium volume
L3
High volume
M
n
Speaker control
M0
Speaker is always off.
M1
Speaker is on during call establishment, but goes off when carrier is detected (default).
M2
Speaker is always on.
M3
Speaker is off during dialing and when receiving carrier, but on during answering.
