53
Command
Function/Options
D
n
&
Wait for credit card dial tone before continuing
with dial string. If the bong is not detected within
the time specified by register S7, the modem will
abort the dial sequence, go on-hook, and
generate an error message.
^
Toggles calling tone for current dial attempt only.
S=
n
Dial stored number (where
n
= 0 to 3).
( )
(Parentheses) Ignored; may be used to format
the dial string.
-
(Dash) Ignored; may be used to format the dial
string.
<Space>
Ignored; may be used to format the dial string.
E
n
Set local echo.
*E0
Disable echoing of commands to screen.
E1
Enable echoing of commands to screen.
H
n
Disconnect (hang-up).
H0
Hangs up (goes on-hook).
H1
Goes off-hook.
I
n
Modem identification.
I0
Display product identification code.
I1
Display checksum.
I2
Display ROM checksum as OK or ERROR.
I3
Display modem firmware revision level.
I6
Report modem data pump and internal code
revision.
L
n
Modem speaker volume.
L0
OFF or low volume.
*L1
Low volume.
L2
Medium volume.
L3
High volume.
M
n
Modem speaker control.
M0
Disable modem speaker.
*M1
Speaker ON until carrier is detected.
M2
Speaker always ON.
M3
Speaker ON after dial, until connection is
established.
CHAPTER 9: Modem Command Set (AT Commands)
