4.0 AT Commands
RC224ATL/224ATLV
EmbeddedModem Family
Table 4-2. AT Command Set Summary (3 of 5)
Command
Function
DTR option
Default
Parameters/Description
n = 0 Modem ignores DTR.
&Dn
n = 0
n = 1 Modem assumes command state when ON-to-OFF
transition is detected on DTR.
n = 2 Modem hangs up, assumes command state and disables
auto-answer upon detecting ON-toOFF transition on
DTR.
n = 3 Modem assumes software reset state upon detecting
ON-to-OFF transition on DTR.
&F
Recall (restore) factory profile
—
S Registers: S0=1, S1=0, S2=43. S3=13, S4=10, S5=8, S6=0,
S7=30, S8=2, S9=5, S10=14, S11=95, S12=50, S18=0, S25=5,
S26=1
Commands: B1, C1, E1, F1, L2, M1, P, Q0, V1, Y0, X4, &C0, &D0,
&G0, &J0, &M0/&G0, &P0, &R0, &S0, &T4, &X0
&Gn
&Jn
Select guard tone
n = 0
n = 0
n = 0 No guard tone.
n = 1 550 Hz guard tone.
n = 2 1800 Hz guard tone.
Telephone jack control
n = 0 Suitable for RJ11, RJ41S. or RJ45S type phone jack.
n = 1 Suitable for RJ12 or RJ13 type phone jack; the A lead is
connected to A1 lead while the modem is off-hook.
&L0
Dial-up line operation
Asynchronous mode
n = 0
n = 0
n = 0 Requests dial-up operation.
&Mn
n = 0 Asynchronous operation.
n = 1 Reserved
n = 2 Reserved
n = 3 Reserved
&Pn
&Q0
Pulse dial make/break ratio
Asynchronous mode
n = 0
n = 0
n = 0 Selects 39%–61% make/break ratio at 10 pps.
(USA/Canada)
n = 1 Selects 33%–67% make/break ratio at 10 pps. (UK/HK)
Idle State
n = 0 Normal
n = 1 Reserved
n = 2 Reserved
n = 3 Reserved
On-line State
Asynchronous
Reserved
Reserved
Reserved
&Sn
DSR override
n = 0
n = 0 DSR will remain ON at all times.
n = 1 DSR will become active after answer tone has been
detected and inactive after the carrier has been lost. DSR
is OFF when the modem is in test mode or idle state.
4-4
Conexant
D224ATLVDSC
CONEXANT [ CONEXANT SYSTEMS, INC ]
