41
ATEn
E, E0: Disable echo
E1: Enable echo
ATHn
H, H0, H1: Disconnect current TCP connection
All the data will be cleared
ATOn
O, O0: Turn to data mode
ATQn
Q, Q0: Response display on (default)
Q1: Response display off
ATVn
V, V0: Response = <numeric code> [CR][LF]
V1 (default): Response = <verbose code> [CR][LF]
AT&Dn
D, D0: ignore DTR(PC) signal
D2(default): disconnect TCP session
AT&Fn
F, F0, F1: Restore default modem settings
AT&Kn
K, K0: No flow control
K3: RTS/CTS flow control (default)
K4: Xon/Xoff (if supported)
AT&Sn
S, S0: DSR(PC) always high
S1: DSR(PC) shows TCP connection
If failure,
ERROR [CR][LF]
ATIn
I, I0 : display “Sena Technologies, Inc.”
I3 : display model number
Others : display “OK”
AT\Tn
Set inactivity timer to n minutes
\T, \T0: inactivity timer disabled (default)
OK [CR][LF]
AT\Tsn
Set inactivity timer to n seconds
\Ts, \Ts0: inactivity timer disabled (default)
OK [CR][LF]
ATBn, ATCn, ATLn, ATMn,
ATNn, ATP, ATT, ATYn,
AT%Cn, AT%En, AT&Bn,
AT&Gn, AT&In, AT&Qn,
AT&V, AT}Mn, AT\An,
AT\Bn, AT\Nn
None OK
[CR][LF]
ATS?, ATSn=x, AT&Cn,
AT&Wn, AT&Zn=x
None ERROR
[CR][LF]
ATFn None
If n=1
OK [CR][LF]
If others,
ERROR [CR][LF]
ATWn, ATXn
None
If n=0
OK [CR][LF]
If others,
ERROR [CR][LF]
Table 4-4. AT commands Response Code
Verbose Code
(After “ATV1” command executed)
Numeric Code
(After “ATV0” command executed)
Description
OK 0
Command
executed
CONNECT
1
Modem connected to line
RING
2
A ring signal has been detected
NO CARRIER
3
Modem lost carrier signal
ERROR 4
Invalid
command