Multitech MULTI MODEM II MT5600BA - Manual (Page 42)

4 AT Commands, S-Registers, and Result Codes
36
MultiModemII User Guide
Command: &C n Data Carrier Detect (DCD) Control
Values: n = 0 or 1, 2 or 3, 4 or 5
Default: 1, 3, 4
Description: &C0 Forces the DCD circuit to always be high.
&C1 DCD goes high when the remote modem’s carrier signal is de-
tected, and goes low when the carrier signal is not detected.
&C2 DCD goes high 500 milliseconds after the CONNECT message is
generated.
&C3 DCD goes high when the CONNECT message is generated.
&C4 Disables &C5 command.
&C5 On UNIX systems, holds DCD low until the proper callback
security password has been entered or until a disconnect occurs.
This prevents the UNIX login prompt from being displayed be-
fore the callback security ENTER PASSWORD prompt appears.
Command: &D n Data Terminal Ready (DTR) Control
Values: n = 0, 1, 2, or 3
Default: 2
Description: This command interprets the high to low transition of the DTR
signal sent by the computer according to the supplied param-
eter. The action taken depends on the current &Q setting.
&D0 &Q0, &Q5, &Q6: DTR is ignored (assumed high). Allows op-
eration with computers that do not provide DTR.
&Q1
: DTR drop causes the modem to hang up. Autoanswer is
not affected.
&Q2
, &Q3: DTR drop causes the modem to hang up. Autoan-
swer is inhibited.
&D1 &Q0, &Q1, &Q5, &Q6: DTR drop is interpreted by the modem
as if the asynchronous escape sequence had been entered. The
modem returns to asynchronous command state without dis-
connecting.
&Q2
, &Q3: DTR drop causes the modem to hang up. Autoan-
swer is inhibited.
&D2 &Q0–&Q6: DTR drop causes the modem to hang up. Autoan-
swer is inhibited.
&D3 &Q0, &Q1, &Q5, &Q6: DTR drop causes the modem to per-
form a soft reset as if the Z command were received. The &Y set-
ting determines which profile is loaded.
&Q2
, &Q3: DTR drop causes the modem to hang up. Autoan-
swer is inhibited.
&Q5
or &Q6 and +FCLASS=1 or +FCLASS=2: Same as for &Q0.
Note: If &D1, &D2, or &D3 is set, the modem will not dial
without a DTR drop.
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).