INSYS Modem 56k small INT 2.0/USB 1.0
AT Command Set
June 06
55
Command
Description
ATL<n>
Speaker
volume
This command regulates the speaker volume (see
ATM
)
ATL1
Speaker volume low (default)
ATL2
Speaker with medium volume
ATL3
Speaker with high volume
Note:
The speaker output is optional and is not supported in the standard
version.
AT%L
Display level of the received signal
The value that is reported from the modem equals the already amplified level within
the modem, not the phone line level.
Large
AT%L
responses imply a low signal level; small values imply a high signal level
(009 = -9db, 043 = -43db)
AT*L<n>
Determines the automatic speed limitation
The automatic speed limitation is used to automatically achieve the least possible
error rate for connections without error correction.
In the factory settings, the speed limitation is always switched on (
AT*L0
).
If the limitation is switched off (
AT*L1
), the modem will always establish the connec-
tion on the phone side with the maximum possible speed (or the speed defined with
AT+MS
), irrespective of the data rate at the serial interface. This means that the INSYS
Modem 56k small INT will, for example, always attempt to establish a 33600 baud
connection, even if the serial interface is only set to 9600 baud. Without error correc-
tion the high speed will obviously lead to higher bit error rates, which is usually disrup-
tive.
The automatic speed limitation (
AT*L0
) will limit the speed on the phone side to the
speed of the serial interface.
It should only be switched off if very low baud rates are employed or if the speed of
the serial interface is changed during the connection.
ATM<n>
Speaker
control
This command regulates when the speaker is active.
(see command
ATL
).
ATM0
Speaker
always
OFF
ATM1
Speaker ON during dialing and connection setup (default)
ATM2
Speaker
always
ON
ATM3
Speaker on during connection setup
