User guide

4 AT Commands, S-Registers, and Result Codes
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&D1 When DTR drops while in online data mode, the modem
enters command mode, issues an OK, and remains connected.
&D2 When DTR drops while in online data mode, the modem
hangs up.
&D3 When DTR drops, the modem hangs up and resets as if an
ATZ command were issued.
Command: &E n V.42 Error Correction Modes
Values: n = 0, 1, or 2
Default: 1
Description: &E0 V.42 non-error correction mode (V.42 disabled).
&E1 V.42 auto-reliable mode.
&E2 V.42 reliable mode (V.42 enabled).
Note: See also the \N and L5 commands.
Command: &E n Modem-Initiated Flow Control
Values: n = 3, 4, or 5
Default: 4
Description: &E3 Flow control disabled.
&E4 CTS/RTS hardware flow control.
&E5 XON/XOFF software flow control.
Note: See also the &K command.
Command: &E n Data Compression
Values: n = 14, 15
Default: 15
Description: &E14 Disables data compression.
&E15 Enables data compression.
Command: &F n Load Factory Settings
Values: n = 0 or 1
Default: None
Description: &F0 Load factory configuration 0.
&F1 Load factory configuration 1.
Note: See also the L5 and Z commands.
Command: &G n V.22bis Guard Tone Control
Values: n = 0, 1, or 2
Default: varies by country
Description: &G0 Disables guard tone.
&G1 Sets guard tone to 550 Hz.
&G2 Sets guard tone to 1800 Hz.
Note: The &G command is not used in North America, and
may not be permitted in some countries.