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AT Command Set and S-Registers
Table 4-1. AT Command Reference (3 of 18)
AT
Command Description
E n
Command Character Echo
This command controls whether or not the characters you
enter from your computer's keyboard are echoed back to your
monitor when the modem is in Command mode.
E0
E1
Fn
On-line Echo
This command is normally used to select whether the modem
echoes data back to the host during online data mode. This
device set does not support online data mode echo.
F0
F1
H n
Hook
This command lets the modem go on-hook to disconnect a call
or off-hook to make the telephone line busy.
H0
H1
I n
Identification/Checksum Option
This command displays specific information about your
modem and allows you to verify the ROM checksum.
I0
I1
I2
I3
K
Reserved. (Should always be set to K1.)
L
Reserved.
M n
Speaker On/Off Control
M0
M1
M2
M3
4-4
Issue 1 November 1994
Disables echo.
Enables echo.
Echo enabled (returns an error message).
Echo disabled.
The modem goes on-hook (disconnects a call).
The modem goes off-hook.
Displays product code .
Displays firmware revision number.
Verifies ROM Checksum.
Displays device set name.
Speaker always off.
Speaker on until carrier signal becomes active.
Speaker always on.
Speaker off during dialing and on until carrier signal
becomes active.
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