23
To force different communication
speeds
Type these AT commands
and press Enter
Disable both 56K and auto rate on
V.34—33600 bps
AT+MS=V34,1
V.34—33600 bps
AT+MS=V34,0
V.32bis—14400 bps
AT+MS=V32B,0
V.32—9600 bps
AT+MS=V32,0
2400 bps
AT+MS=V22B,0
1200 bps
AT+MS=V22,0
Notes:
Some software allows these commands to be added to
the list of dial prefixes or the initialization string.
•
When the protocol is forced, the modem will not attempt to
connect at other protocols if it cannot connect at the forced
protocol. It will try to connect at the fastest speed available
within the forced protocol.
•
There are other configurations that can be forced. To select a
particular configuration, use the
AT
command strings shown
below. You can always return to the modem’s default configu-
ration by typing
AT &F
and pressing the
Enter
key.
If you do this, the modem will not receive the commands in your
software’s initialization string as it normally would. Using the
ATZ
command overcomes this problem if you have saved all of your
setup parameters in nonvolatile memory.
To save setup parameters in nonvolatile memory in
AT
command
mode, type
AT
, followed by the parameter settings, then
&W.
Press
Enter
. For example, if you type
AT &C1 &D2 &W
and press
Enter
, the
&C1
and
&D2
parameter settings are stored.
To force
Type command & press Enter
MNP 5/MNP 4 operation
AT \N5
LAPM only (V.42)
AT \N4
MNP 4 only
AT \N5%C0
V.42bis data compression
AT+DCS=1,0
V.44 data compression only
AT+DCS=0,1
Auto-answer
AT S0=1
