15
Table 11
Read/write to S registers
Command
Description
Sn?
Sn=v
Read and display value of register r
Set default S register to value v
Table 12
Result code and dialing options
Command
Description
X0
X2
X3
X4
Basic call progress, blind dialing
Extended call progress, dial tone detection
Extended call progress, blind dialing and busy
signal detection
Extended call progress, dial tone, and busy signal
detection
Table 13
Long space disconnect
Command
Description
Y0*
Y1
Long space disconnect disabled
Long space disconnect enabled
* = default
Table 14
Carrier detect (DCD) options
Command
Description
&C0*
&C1
DCD always on; state of carrier signal is ignored
DCD on only in presence of carrier signal
* = default
Table 15
Data terminal ready (DTR) options
Command
Description
&D0
&D1
&D2*
&D3
Ignore DTR signal
Return to command mode after losing DTR
DTR always active, hang up after transition
Modem performs soft reset
* = default