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Hayes command set
Page 1
Hayes 2400-SmartModem Command Set
=================================
Cmd Settings Meaning
--- -------- -------
ATB ATB0 CCIT format *
1 BELL format
ATE ATE0 Commands not echoed
1 Commands echoed *
ATL ATL0 Speaker volume low
1 Low
2 Medium *
3 High
ATM ATM0 Speaker always off
1 Speaker on except while connected *
2 Speaker always on
3 Speaker on except while connected & dialing
ATQ ATQ0 *
1 Quiet mode
ATV ATV0 Numeric response codes
1 Verbose response codes *
ATX ATX0 SM-300 compatibility mode
1 Extended 'connect' msgs
2 Dialtone detect
3 Busy detect
4 Dialtone and busy detect *
AT&J AT&J0 RJ-11/41/45 jack *
1 RJ-12/13 (A A1 control leads)
AT&L AT&L0 Dialup async/sync *
1 Leased line async/sync
AT&M AT&M0 Async *
1 Sync mode 1 (async call placement)
2 Sync mode 2 (stored number dial DTR)
3 Sync mode 3 (manual dial DTR control)
AT&G AT&G0 No guard tones *
1 550 Hz guard tone
2 1800 Hz guard tone
AT&P AT&P0 US 39%make 61%break pulse dial *
1 UK 33%make 67%break
Page 2
Cmd Settings Meaning
--- -------- -------
ATY ATY0 No long space disconnect *
1 Long space disconnect, recv & xmt
AT&C AT&C0 Carrier detect always on *
1 Carrier detect follows signal
AT&D AT&D0 Ignore DTR *
1 DTR low = command mode (stays online)
2 DTR low = drop connection
3 DTR low = ATZ
AT&R AT&R0 Clear-to-send tracks RTS *
1 CTS for half-duplex transmit
AT&X AT&X0 Transmit clock internal *
1 Clock from DTE pin 15
2 Clock from rcv signal out pin 15
ATA Enter answer mode
A/ Execute last command
ATD T Tone dial
P Pulse dial
R Reverse mode (ans/orig)
W Wait for dialtone
@ Wait for quiet answer
, Pause
! Flash
; Return to command state
S Dial stored number
ATH ATH0 Hang up (on-hook)
1 Pickup line (off-hook)
ATO ATO0 Return online
1 Retrain equalizer & return online
ATZ Reset configuration from stored profile
AT&F Reset configuration from factory settings
AT&W Store active profile
AT&Znn Store one dial number
ATI ATI0 Show product code
1 Show checksum
2 Verify checksum
Page 3
Cmd Settings Meaning
--- -------- -------
AT&T AT&T0 Terminate any test
1 Local analog loopback
3 Local digital loopback
4 Allow a remote digital loopback request
5 Prohibit remote digital loopback request
6 Initiate remote digital loopback
7 Initiate remote digital loopback with selftest
8 Initiate local analog loopback with selftest
Register 0 0-255 rings 00 Ring to answer on
1 0-255 rings Ring count
2 0-127 ascii 43 Escape code char
3 0-127 ascii 13 Carriage return char
4 0-127 ascii 10 Line feed
5 0-127 ascii 08 Backspace char
6 0-255 seconds 02 Wait for dialtone
7 1-30 seconds 30 Wait for carrier
8 0-255 seconds 02 Pause time comma
9 1-255 .1 sec 06 Carr detect response
10 1-255 .1 sec 14 Lost carrier hangup
11
12 0-255 .02 sec 50 Escape guard time
13
14 none Options register
15
16 none 00 Modem test options
17
18 0-255 seconds 00 Test timer
19
20
21 none Options register
22 none 76'x Options register
23 none 07 Options register
24
25 0-255 seconds 05 Sync delay to DTR
26 0-255 seconds 00 RTS/CTS delay HD
27 none 00 Options register
Page 4
Result 0 OK Acknowledge execution
Codes 1 CONNECT 0-300 bps connection
2 RING Ring detected
3 NO CARRIER No connect or lost
4 ERROR Error
5 CONNECT 1200 1200 bps connection
6 NO DIALTONE No dialtone found
7 BUSY Busy signal
8 NO ANSWER @, no quiet answer
9 CONNECT 0600 600 bps connection
10 CONNECT 2400 2400 bps connection
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