INSYS Modem 336 LL 2D/4D 5.x Originate / Answer Manual page 57

INSYS Modem 336 LL 2D/4D 5.x Originate / Answer
Command
AT*L<n>
ATM<n>
AT+MR=<n>
Description
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 INSYS Modem 336 LL 2D/4D 5.x Originate /
Answer will always establish the connection 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 336 will, for example, always at-
tempt to establish a 33600 baud connection, even if the serial interface is only set to
9600 baud. Without error correction the high speed will obviously lead to higher bit
error rates, which is usually disruptive.
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.
Speaker control
This command regulates when the speaker is active
(see command ATL<n>).
ATM0 Speaker always OFF
Speaker ON during dialing and connection setup (default)
ATM1
ATM2 Speaker always ON
ATM3 Speaker ON during connection setup
Show modulation type
The command AT+MR=<n> enables the display of the modulation type after the mes-
sage CONNECT.
AT+MR=0 Switches the data flow control OFF (default)
AT+MR=1 Switches the display function ON. The displayed value applies to the
sent data.
Switches the display function ON. The displayed value applies to the
AT+MR=2
received data.
If the display function is switched on the INSYS Modem 336 LL 2D/4D 5.x Originate /
Answer will display the modulation type and the line speed after the message CON-
NECT. After the message CONNECT the line "+MCR:" appears, followed by the modula-
tion type (see command AT+MS and the line "+MRR: ", followed by the line speed.
Note: The command AT+MR is useful for a connection check.
AT Command Reference
57