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User’s Manual C-3
AT Commands
En Echo command
This command controls whether or not the characters entered from your
computer keyboard are displayed on your monitor (echoed) while the
modem is in command mode.
E0 Disables echo to the computer.
E1 Enables echo to the computer (default).
Result Codes:
OK n=0,1
ERROR Otherwise
Hn Hook control
This command instructs the modem to go on-hook to disconnect a call, or
off-hook to make the phone line busy.
H0 Modem goes on-hook (default).
H1 Modem goes off-hook.
Result Codes:
OK n=0,1
ERROR Otherwise
In Request ID information
This command displays product information about the modem.
I0 Returns modem identity string and driver version number.
I3 Same as I0.
I9 Returns region ID in English.
Result Codes:
OK n=0,3,9
ERROR Otherwise
Ln Monitor speaker volume
This command sets speaker volume to low, medium, or high.
L0 Low volume.
L1 Low volume. (Same as L0)
L2 Medium volume (default).
L3 High volume.
Result Codes:
OK n=0,1,2,3
ERROR Otherwise
Mn Monitor speaker mode
This command turns the speaker on or off.
M0 The speaker is off.
M1 The speaker is on until the modem detects the carrier signal
(default).