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4 AT Commands, S-Registers, and Result Codes
Command:
&W n Store Current Configuration
Values:
n = 0
Default:
None
Description:
&W0 Stores current modem settings in nonvolatile memory as pro-
file 0 and causes them to be loaded at power-on or following
the ATZ command instead of the factory defaults.
&W1 Stores current modem settings in nonvolatile memory as pro-
file 1 and causes them to be loaded at power-on or following
the ATZ command instead of the factory defaults.
Note: See also the Z, &F, and &Y commands.
Command:
&Y n Select Profile for Hard Reset
Values:
n = 0 or 1
Default:
None
Description:
&Y0 Select profile 0 to be loaded on power-up.
&Y1 Select profile 1 to be loaded on power-up.
Note: See also the &W and Z commands.
Command: &Z y=x Store Telephone Number
Values:
y = 0–3
x = Dialing command
Default:
None
Description:
Stores telephone dial string x in memory location y. Each tele-
phone number dial string can contain up to 34 digits. Dial the
stored number using the command ATDS=y.
Command:
%C n Data Compression Control
Values:
n = 0, 1, 2, or 3
Default:
3
Description:
Enables or disables data compression negotiation. The modem
can only perform data compression on an error-corrected link.
%C0 Disables data compression.
%C1 Enables MNP 5 data compression negotiation.
%C2 Enables V.42bis data compression negotiation.
%C3 Enables both V.42bis and MNP 5 data compression negotiation.
Command:
%E n Line Quality Monitor
Values:
n = 0, 1, or 2
Default:
2
Description:
Controls whether or not the modem will automatically moni-
tor the line quality and request a retrain (%E1) or fall back to a
lower speed when line quality is insufficient and fall forward
to a faster speed when line quality is sufficient (%E2).
%E0 Disable line quality monitor and auto-retrain.
%E1 Enable line quality monitor and auto-retrain.
%E2 Enable line quality monitor and fallback/fall forward.
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