Chapter 11 Communication Specifications
11-6
(2) List of commands (extract)
1] AT commands
Command Function overview Example
AT Automatically recognizes data format
A/ Re-executes the response directly preceding
ATA Forced reception
ATDmm Dial ATD12345678
ATEn Command echo (echo back a text string entered to modem) 0: No
1: Yes
ATE0
ATHn Line ON/OFF 0: On hook (disconnect)
1: Off hook
ATH0
ATH1
ATPn Pulse (dial) setting 0, 1: 10 pps
2 : 20 pps
ATP0, ATP1
ATP2
ATQn Result code setting 0: Yes 1: No ATQ0
ATT Tone (push) setting ATT
ATSn = X Sets S register value. ATS0 = 0
ATVn Result code display format 0: Number
1: Word
ATV0
ATV1
AT&Cn CD signal control 0: Always on
1: Depends on the carrier of counter-party modem
AT&C0
AT&C1
AT&Dn ER signal control
0: Always on
2: Turning from on to off during communication disconnects line
3: Turning from on to off resets the software
AT&D0
AT&D2
AT&D3
AT&Sn DR signal 0: Always on
1: Depends on sequence
2: Depends on CD signal
AT&S0
AT&S1
AT&S2
AT&Rn RI(CI) signal control
0: Turns on from calling start until communication begins
1: Turns on from calling start until communication ends
2: Turns on/off in synchronization with the call signal
AT&R0
AT&R1
AT&R2
2] S register
S register Set value Function
S0 0 no automatic
reception
1 to 255
Setting for automatic reception/reception ring count
S2 0 to 127
(43 [+] )
Escape code setting
S3 0 to 127
(13 [CR] )
CR code setting
S4 0 to 127
(10 [LF] )
LF code setting
3] Result codes
Number format Word format Meaning
0 OK Normal execution
1 CONNECT Connection complete
2 RING Reception detected
3 NO CARRIER Line disconnected
4 ERROR Command error
5 CONNECT 1200 1200 bps connection
6 NO DIAL TONE Cannot hear dial tone
7 BUSY Busy signal detected
8 NO ANSWER No tone heard
10 CONNECT 2400 2400 bps connection
11 CONNECT 4800 4800 bps connection
12 CONNECT 9600 9600 bps connection
13 CONNECT 14400 14400 bps connection
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