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MTL01
3.
MODEM AT COMMAND SET
The modem supports a complete AT commands set to define the configuration, initiate or terminate modem
communication, test the modem and the communication link. The modem will work in two basic operations:
command mode and data mode.
COMMAND mode is when the modem is not connected to another modem, therefore "Off Line" or in a idle
condition. In this mode the modem will accept commands beginning with AT prefix. DATA mode is when the
modem is connected to another modem, that is an "On Line" condition or functioning. In this mode all the
characters sent from computer are interpreted as data and they are sent to the remote modem. You may
switch from data to command mode by entering an escape sequence. The default escape sequence is +++.
To be valid, the sequence must be followed by an AT command, i.e. "+++AT<CR>".
Data Length
Digicom's modems can manage the following ASCII code formats:
CASE
START BIT
1
1
2
1
3
1
The modem will accept even, odd, mark, or space.
3.1.
AT COMMAND SET DESCRIPTION
NOTE:
" " default factory commands
AT
Attention
All the characters following the letters 'AT' are commands. In AT command mode the modem automatically
detects the computer speed and parity format. The modem will response using the same speed and parity
format of AT command.
ATA
Answer incoming data call
Cause the modem to go off hook and attempt a handshake in answer mode.
A/
Repeat last command
Cause the modem to repeat the last AT command. This command must not be preceded by AT and followed
by CR.
ATD
Dial Command
0:9
Dial numbers
*
DTMF digits
#
DTMF digits
A..D
DTMF digits
P
Pulse dial
T
Tone dial
S=n
Select a number stored in the modem internal book (see AT&Z command)
!
Flash
W
Wait for dial tone
@
Wait for five seconds of silence
,
Pause
L
Recall the last number dialed
;
Return to Command state. Added to the end of the dial string, this causes the modem to return
to the command state after it processes the portion of the dial string preceding the ";". The
modem will enter call progress only after an additional dial command is issued without the ";"
terminator.
ATE
Commands Echo
E0
Commands echo disabled.
E1
Commands echo enabled.
DATA BIT
PARITY
STOP BIT
7
1
8
0
7
0
3.1
Modem AT Command Set
TOT
1
10
1
10
2
10
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