Table of Contents
Advertisement
2-2 AT Commands Description
AT
Means "Attention"
Each modem's command should start with "AT" character.
ATA
Go On-line in Answer Mode
This command instructs the modem to go off-hook immediately and then make a
handshake with the remote modem. Handshaking is not available during leased
line operation.
A is usually used to manually answer an incoming call or to switch from voice
conversation to data communication.
For others modem command, please refer to the following table from 2.1 ~ 2.26 for detail.
Each command would has denoted with an "*" which for means default setting.
Table 2.1
Basic AT Commands
Basic AT Commands
A/ - Re-execute Command
AT=x - Write to Selected S-register
AT? - Read Selected S-register
A - Answer
Bn - CCITT or Bell
Cn - Carrier Control
Dn - Dial
dial modifiers
En - Command Echo
Fn - Select Line Modulation
Hn - Disconnect
In - Identification
Description
A/ - Re-execute Command
AT=x - Write to Selected S-register
AT? - Read Selected S-register
A - Answer
0= Responds with OK but does nothing.
1= Responds with OK but does nothing.
1= Responds with OK but does nothing.
0 1 2 3 4 5 6 7 8 9 A B C D * # (Dial digits)
L (redial last number) - Responds with Error if ATDL is issued
but if L is embedded in the dial string, it is considered as a
presentation character and hence ignored.
P (Pulse)
T (Tone)
R (Reverse to answer mode)
S=n (where n = 0 - 3)
! (Flash)
W (Wait for dial tone)
@ (Wait for silence)
, (Pause)
; (Return to command state)
^ (toggles calling tone enable/disable) - ^ is considered as a
presentation character.
H (for hangup)
- (at end of phone number for linking)
0=disable
1=enable*
0 to 10=Responds with OK but does nothing.
0=onhook
1=offhook
0=product code showing 56000 **
1=rom checksum
2=calc rom checksum
Advertisement
Table of Contents
