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CP-07.TXT
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1992-01-14
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AT Command is a command issued by the computer/terminal to the modem
through the RS232 serial port in asynchronous data format when the
modem is in command state. An 'AT' command prefix (ATtention) precedes
each command line, except in the case of 'A/', 'A>>', and '+++'. The
'A/' re-execute the last command once. 'A>>' re-execute the last command
once, and repeat the last call up to 9 times until aborted by physically
pressing any key on the keyboard or front panel or until a successful
connection with a remote modem has been made. These commands are not
preceded by AT nor followed by characters. Up to 40 commands can be
entered in a single command line with a single AT prefix.
Basic AT Command Set
Following is a list of the basic AT command set. Each command should
be entered following an AT prefix. A '+' mark placed before an AT
command in the list indicates that it is a default setting.
A Answer mode on-line.
+ B0 Select CCITT V.22 standard for 1200 bps
communication (Default).
B1 Select Bell 212A standard for 1200 bps communi-
cation.
D Enter originate mode, dial number that follows,
attempt to go on-line.
Digits and modifiers that can be used with the D command:
0-9,#,* Digits for dialing.
P Pulse dial.
T Tone dial.
W Wait for second dial tone.
, Pause for a time designated by S6.
; Return to command state after dialing.
@ Wait for quiet answer (no dial tone will be
heard).
! Hook flash (call transfer).
R Originate a call in answer mode.
DL Dial the last-dialed number.
DSn Dial number stored in EEPROM at location n(0-9).
E0 Disable character echo in command state.
+ E1 Enable character echo in command state(Default).
H0 Go on-hook (hang-up).
H1 Go off-hook.
I0 Display product informations.
I1 Display results of ROM checksum.
I2 Display link diagnostic report.
L0-7 Speaker volume control. The higher the value,
the higher the volume (Default is L4).
M0 Speaker always OFF.
+ M1 Speaker ON until carrier detected (Default).
M2 Speaker always ON.
M3 Speaker ON after last digit is dialed out and
when carrier is detected.
N0-7 Ring volume control. When a call comes in, speaker
will ring to indicate an incoming call. N0 will
disable the ring function (Default is N5).
O Return to on-line state.
P Pulse dial.
+ Q0 Modem returns result code (Default).
Q1 Modem does not return result code.
Sr=n Set S-Register 'r' to value 'n', n must be a
decimal number between 0-255.
Sr=? Display value stored in S-Register 'r'.
+ T Tone dial (Default).
V0 Display result code in numeric form.
+ V1 Display result code in verbose form (Default).
Xn Result code and call progress monitor options
(Default is X5).
Result codes. X0 X1 X2 X3 X4 X5 X6 X7
0 OK 0 0 0 0 0 0 0 0
1 CONNECT 0 0 0 0 0 + + +
2 RING 0 0 0 0 0 0 0 0
3 NO CARRIER 0 0 0 0 0 0 0 0
4 ERROR 0 0 0 0 0 0 0 0
5 CONNECT 1200 0 0 0 0 + + +
6 NO DIAL TONE 0 0 0 0 0
7 BUSY 0 0 0 0 0
8 NO ANSWER 0 0 0 0 0
9 RINGING 0 0 0 0 0
10 CONNECT 2400 0 0 0 0 + + +
11 CONNECT 4800 0 0 0 0 + + +
12 CONNECT 9600 0 0 0 0 + + +
14 CONNECT 19200 0 0 0 0 + - -
15 CONNECT 7200 0 0 0 0 + + +
16 CONNECT 12000 0 0 0 0 + + +
17 CONNECT 14400 0 0 0 0 + + +
18 CONNECT 16800 0 0 0 0 + - -
19 CONNECT 38400 0 0 0 0 + - -
20 CONNECT 57600 0 0 0 0 + - -
21 CONNECT 76800 0 0 0 0 + - -
NOTE:
+ If error control result codes enabled (X5, X6, X7),
the result message will be formated as
CONNECT DTE speed/Link spped/*Error control level --X5
CONNECT Link speed/ARQ ------ X6
CONNECT Link speed/ARQ/*Error control level ---------X7
* NOTE: Data compression included.
Examples:
For X5 --
CONNECT 38400/V.32 9600T/MNP5
CONNECT 57600/V.32b 14400/V.42b
For X6 --
CONNECT 9600/ARQ
CONNECT 14400/ARQ
For X7 --
CONNECT 9600/ARQ/MNP5
CONNECT 14400/ARQ/V42b
Z0 Reset modem and load user profile 0.
Z1 Reset modem and load user profile 1.
Z2 Reset modem and load user profile 2.
Z3 Reset modem and load user profile 3.
Z4 Reset modem and load factory settings.
NOTE:
Factory default is the default power-on
profile.
+++ Escape sequence code, entered in data state, wait
for modem to return to command state.
$ Basic command summary HELP.
&$ Extended command summary HELP.
*$ Enhanced command summary HELP.
Extended AT Command Set
&B0 DTE/DCE rate follows link rate.
(If the communication software package has
autobaud rate detection, please turn it ON).
+ &B1 DTE/DCE rate fixed at DTE setting, range from
300 to 76.8Kbps (Default).
&C0 Assume that the carrier is always present (force
CD always ON).
+ &C1 CD tracks presence of carrier (Default).
+ &D0 Ignore DTR signal, assume DTR always ON
(Default).
&D1 108.1, DTR OFF-ON transition causes dial of the
default number.
&D2 108.2, Data Terminal Ready, DTR OFF causes the
modem to hang up and return to command state.
&D3 108.2, Data Terminal Ready, DTR OFF causes the
modem to hang up, return to command state and
reset to profile 0.
&F Load factory settings to RAM as active
configuration.
+ &G0 No guard tone (within US, Canada) (Default).
&G1 Reserved.
&G2 1800 Hz guard tone.
&H0 Flow control disabled.
&H1 Reserved.
&H2 Reserved.
+ &H3 Hardware RTS/CTS flow control (Default).
&H4 Software XON/XOFF flow control.
&H5 Reserved.
+ &J0 Single phone line RJ11 phone jack (Default).
&J1 Multiple phone/modem lines RJ12/RJ13 phone
jack.
&K0 No error control.
&K1 MNP4 (includes MNP3).
&K2 MNP4 + MNP5.
&K3 V.42; compatible with &K1.
+ &K4 V.42 + V.42bis; compatible with &K2 (Default).
+ &L0 Dial-up line (Default).
&L1 2-wire leased line.
&L2 4-wire leased line.
+ &M0 Asynchronous mode, buffered (Default).
&M1 Asynchronous command, synchronous data.
&M2 Direct asynchronous mode, no buffer.
&M3 Synchronous mode.
+ &N0 Multi-Auto, auto negotiate highest possible link
rate ( V.32bis 14400/12000/7200, V.32 9600T/9600
/7200T/4800, V.22bis 2400/1200, V.22 1200, and
Bell 212A 1200, V.17FAX 14400/12000/9600/7200,
V.29FAX 9600/7200, V.27terFAX 4800/2400) (Default).
&N1 V.33 14400/12000.
&N2 V.33 12000.
&N3 V.32 9600T/9600/7200T/4800.
&N4 V.32 9600/7200T/4800.
&N5 V.32 4800.
&N6 V.29 9600.
&N7 V.29 7200.
&N8 V.29 4800.
&N9 V.27ter 4800.
&N10 V.27ter 2400.
&N11 V.26bis 2400.
&N12 V.23 1200/75.
&N13 V.23 600/75.
&N14 V.22bis 2400/1200.
&N15 V.22 1200.
&N16 V.21 300.
&N17 V.32bis 14400/12000/7200.
&N18 V.32bis 12000/7200.
&N19 V.32bis 7200.
&N24 Bell 212A 1200.
&N25 Bell 103 300.
&N32 V.17FAX 14400/12000/9600/7200.
V.29FAX 9600/7200.
V.27terFAX 4800/2400.
&N34 Reserved.
&N35 Reserved.
&N36 Reserved.
NOTE:
All speeds over 9600 bps are trellis
coded except V.29; V.32bis 7200 is also
trellis coded. Not all modes available in
all models. Check the compatibility table.
+ &P0 Pulse dial make/break ratio= 39%/61%(Default).
&P1 Pulse dial make/break ratio= 33%/67%.
&R0 CTS tracks RTS, response delay is set in
S-register 26.
+ &R1 Modem assumes RTS always ON, ignores the changes
(Default).<R>
+ &S0 Modem forces DSR always ON (Default).
&S1 According to CCITT.
&T0 Terminate test in progress.
&T1 Initiate Analog Loopback test.
&T2 Reserved.
&T3 Initiate Local Digital Loopback test (hardware
diagnostic test).
+ &T4 Grant Remote Digital Loopback request from
remote modem (Default).
&T5 Deny Remote Digital Loopback request from
remote modem.
&T6 Initiate Remote Digital Loopback test.
&T7 Initiate Remote Digital Loopback with self
test.
&T8 Initiate Analog Loopback with self test.
&V0 View current active settings.
&V1 View user profile 0 settings.
&V2 View user profile 1 settings.
&V3 View user profile 2 settings.
&V4 View user profile 3 settings.
&V5 View factory default settings.
&W0 Save current settings to user profile 0.
&W1 Save current settings to user profile 1.
&W2 Save current settings to user profile 2.
&W3 Save current settings to user profile 3.
+ &X0 Modem provides synchronous transmit clock
signal (Internal clock) (Default).
&X1 Terminal provides synchronous transmit clock
signal (External clock).
&X2 Receiving carrier provides synchronous transmit
clock signal (Remote or Slave clock).
+ &Y0 Destructive, expedited (Default).
&Y1 Non-destructive, expedited.
&Y2 Non-destructive, unexpedited.
&Zn=s Store the dial string (s) to EEPROM at location
n (n=0-9).
&Z? Display all the phone numbers stored in EEPROM.
Enhanced AT Command Set
+ *B0 Disable dial-backup (Default).<R>
*Bn Enable dial-backup and set dial-backup pointer
at location n-1.
+ *C0 10-bit character length (Default).
*C1 11-bit character length.
*C2 9-bit character length.
*C3 8-bit character length.
*Dn Set default dial pointer at location n.
+ *E0 If error control negotiation fails, keep the
nonerror control connection (Default).
*E1 If error control handshake fails, terminate the
call(hang up).
*F0 Deny remote configuration. (Default)
*F1 Accept remote configuration. (and Remote Digital
loopback must be granted---AT&T4 )
+ *G0 Disable security function
*G1 Enable level 1 secutity, with password
check.
*G2 Enable level 1 security, with password
check and call back.
*G3 Enable level 2 secutity, with password
check.
*G4 Enable level 2 security, with password
check and call back.
*G5 Enable level 2 security, with password
check and call back, remote site enter
the call back number.
NOTE:
1. The command *Gn needs password checking.
2. In security level 1, the remote site mush be a ZyXEL
modem.
3. In security level 2, the remote site can be any other
modems.
4. Modem can store 10 sets ( 0-9 ) of telephone number.
If call back security disabled, modem will search the
password table to check the remote modem's password.
If match, modem will keep connected, otherwise modem
will hangup the phone. If call back security enabled,
modem will complete security checking, if not match,
modem will just disconnect the line, otherwise modem
will discoonect the line then find the telephone
number and call back immediatly. Remote modem will
auto-answer the phone and response otherwise modem
will disconnect the line.
*HS Modify supervisory password.
*Hn Modify user password. ( n=0-9 )
NOTE:
These commands *Hn and *HS need password checking.
Any charcter could be entered as a password ( 0-255 ).
Maximum characters for password are eight.
+ *I0 AT command set (Default).
*I1 V.25bis command set.
*L0 Panel key normal.
*L1 Panel key locked.
+ *M0 Leased line auto-handshake on originate mode
(Default).
*M1 Leased line auto-handshake on answer mode.
*P0-15 Leased line transmission power level, range
from 0 dBm to -15dBm (Default = -9dBm).
*Q0 No response to poor signal quality.
*Q1 Retrain action taken if signal quality is poor.
+ *Q2 Adaptive rate; auto fallback or fall forward
(Default).
*Q3 Disconnect for poor quality signal.
*Rab Read remote configuration to local profile.
a= 0-3, local user profile
b= 0-3, remote user profile
4 , remote current configution.
5 , remote factory default.
NOTE:
The command *Rab only works at on-line condition and no
matter async or sync remote site use.
+ *S0 Backward channel disabled (Default).
*S1 Reserved.
*V View password table.
NOTE:
The command *V needs password checking.
*Wab Write local user profile to remote user profile
and reset remote modem from that profile.
a=0-3 , local user profile.
b=0-3 , remote user profile.
NOTE:
The command *Wab only works at on-line condition and no
matter async or sync remote site use.