n=0 Disable caller ID
n=1 Enable caller ID in readable format
n=2 Enable caller ID in HEX format
Must have feature #142. Type ATi10
AT$
HELP, Command Summary
USR
AT%Cn
n=0 Data compression disable
n=1 MNP5 enable
n=2 V.42 enable
n=3 V.42bis and MNP5
V.34, Rockwell, Compression selection
AT%En
n=0 Do not request retrain
n=1 Enable monitoring and retraining
if line is bad
n=2 Enable monitoring and retraining
if line is bad, wait one minute
before renogotiating higher speed
Select modem reaction to DTR. Works with &Q command
AT&Fn
n=0 Load Factory 0, no FC
n=1 Load Factory 1, HW FC
n=2 Load Factory 2, SW FC
Load Factory Default
AT&Gn
n=0 No Guard Tone
n=1 550 Hz Guard Tone
n=2 1800 Hz Guard Tone
Guard Tone
AT&Hn
n=0 Disable TX Flow Control
n=1 CTS
n=2 Xon/Xoff
n=3 CTS and Xon/Xoff
USR, serial port flow control
AT&In
n=0 Disable RX Flow Control
n=1 Xon/Xoff
n=2 Xon/Xoff Chars Filtered
n=3 HP Enq/Ack Host Mode
n=4 HP Enq/Ack Terminal Mode
n=5 Xon/Xoff for non-ARQ Mode
USR, serial port flow control
AT&Kn
n=0 Disable Data Compression
n=1 Auto Data Compression
n=2 Enable Data Compression
n=3 Selective Data Compression
USR, data compression control
AT&Kn
n=0 Disable flow control
n=3 Enable bi-directional hardware
(RTS/CTS) flow control
n=4 Enable software (XON/XOFF)
n=5 Enable trnasparent flow control
n=6 Enable both hardware and software
flow control
n=0 N.American Pulse Dial
(39%/61% and 10PPS)
n=1 UK/Hong Kong Pulse Dial
(33%/67% and 10PPS)
n=2 39%/61% and 20PPS
n=3 33%/67% and 20 PPS (Japan)
Rockwell make/break ratio for pulse dial
AT&Q
n=1 Synch mode 1
n=2 Synch mode 2, dial stored number
when DTR makes transition
n=3 Synch mode 3, manual dialing
n=4 Reserved
n=5 Reliable Asynch mode
n=6 Normal Asynch mode
Rockwell asynch/synch mode
Same as &M, depending on &F
AT&Rn
n=1 Ignore RTS
n=2 RX to DTE/RTS high
USR
AT&Sn
n=0 DSR Always On
n=1 Modem Controls DSR
USR
AT&Tn
n=0 End Test
n=1 Analog Loopback (ALB)
n=3 Digital Loopback (DLB)
n=4 Grant Remote DLB
n=5 Deny Remote DLB
n=6 Remote Digital Loopback
n=7 Remote DLB With Self Test
n=8 ALB With Self Test
USR
AT&Un
n=0 Variable link rate floor.
n=1 Minimum link rate 300 bps
n=2 Minimum link rate 1200 bps
n=3 Minimum link rate 2400 bps
n=4 Minimum link rate 4800 bps
n=5 Minimum link rate 7200 bps
n=6 Minimum link rate 9600 bps
n=7 Minimum link rate 12000 bps
n=8 Minimum link rate 14400 bps
n=9 Minimum link rate 16800 bps
n=10 Minimum link rate 19200 bps
n=11 Minimum link rate 21600 bps
n=12 Minimum link rate 24000 bps
n=13 Minimum link rate 26400 bps
n=14 Minimum link rate 28800 bps
n=15 Minimum link rate 31200 bps
n=16 Minimum link rate 33600 bps
USR
AT&V
Display configuration information
Rockwell
AT&Wn
n=0 Store Configuration 0
n=1 Store Configuration 1
n=0 Do not convert LAPM to MNP
n=1 Convert LAPM connection to
MNP 10
n=3 Enable MNP 10 extended services
detection
Optional feature #143
AT-Qn
n=0 Enable fallback to V.22/V.22bis
n=1 Disable fallback
Optional feature #143
AT-Un
n=0 Allow attenuation to -10 dBm
n=1 Allow attenuation to -18 dBm
n=2 Allow attenuation to -22 dBm
n=3 Allow attenuation to -25 dBm
n=4 Force 2400 bps transmit level to
-10 dBm
n=5 Force 2400 bps transmit level to
-18 dBm
n=6 Force 2400 bps transmit level to
-22 dBm
n=7 Force 2400 bps transmit level to
-25 dBm
Optional feature #143. Forced transmit level change during fall forward
ATA
�
Hayes – Answer Phone Line
ATBn
n=0 V32/CCITT 1200b[s
n=1 Bell Standard 212A 1200bps
n=2 V.23 originate: T75/R1200 when
DTE speed is 1200 bit/second.
V.23 answer: T75/R1200 when
DTE speed is 1200 bit/second.
n=3 – V.23 originate: T1200/R75 when DTE speed is 1200bps.
V.23 answer: T1200/R75 when
DTE speed is 1200BPS.
n=6 V.26 bis when line speed is 1200bps
n=15 V.21 when line speed is 300bps
n=16 Industry Standard 103 when speed
is 300 bps.
n=30 V.22 bis when speed is 2400bps
n=32 V.26 bis when speed is 2400bps
n=41 V.32 when line speed is 4800bps
n=52 V.32 bis when speed is 7200bps
n=60 V.32 when speed is 9600bps
n=64 V.FC when speed is 9600bps
n=70 V.32 bis when handshake begins
at 12000 bps.
n=71 V.FC when handshake begins at 12000 bit/second.
n=75 – V.32 bis when handshake begins at 14400 bit/second.
n=76 – V.FC when handshake begins at 14400 bit/second.
n=81 – V.FC when handshake begins at 16800-28800 bit/second.
Hayes – Communications options
ATD$
HELP, Dial Commands
USR
ATDL
Dial Last Phone Number
USR/Rockwell
ATDn
Dial a Telephone Number
n=0..9#*TPR,;W@!()-
All
ATDSn
Dial Stored Phone Number
USR/Rockwell
ATEn
n=0 No Command Echo
n=1 Echo Command Chars
All
ATFn
n=0 Online Echo
n=1 No Online Echo
USR
ATFn
n=0 Best possible auto-detect, same as
ATN1
n=1 V.21 or Bell 102 300bps
n=3 V.23
n=4 V.22 or Bell 212A 1200bps
n=5 V.22bis 2400bps
n=6 V.32bis or V.32 4800bps
n=7 V.32bis 7200bps
n=8 V.32bis or V.32 9600bps
n=9 V.32bis 12,000bps
n=10 V.32bis 14,400bps
n=13 V.FC 14,400
n=14 V.FC 16,800
n=15 V.FC 19,200
n=16 V.FC 21,600
n=17 V.FC 24,000
n=18 V.FC 26,400
n=19 V.FC 28,800
Rockwell, only used by V.FC modems
Clears register S31 bit 1. F13 and F19 reccommend connection rate.
n=0 Low Speaker Volume
n=1 Low Speaker Volume
n=2 Med Speaker Volume
n=3 Hi Speaker Volume
�
ATMn
n=0 Speaker Off
n=1 Speaker On Until CD
n=2 Speaker Always On
n=3 Speaker Off During Dial
�
ATNn
n=0 Use rate in S37
n=1 Use highest possble rate
Connection Rate
ATOn
n=0 Return Online
n=1 Return Online & Retrain
�
ATP
Pulse Dial
�
ATQn
n=0 Result Codes Sent
n=1 Quiet (No Result Codes)
n=2 Verbose/Quiet On Answer
�
ATT
Tone Dial
�
ATVn
n=0 Numeric Responses
n=1 Verbal Responses
�
ATWn
n=0 Not reported, DTE rate shown
n=1 Result reported
n=2 Not reported, DCE rate shown
Error Correction Result Codes
ATXn
n=0 Basic Result Codes
n=1 Extended Result Codes
n=2 Wait for tone before dialing
n=3 Ignore dial tone
n=4 Wait for tone, detect dialtone and
report busy
�
ATYn
n=0 Next reset to &W0 settings
n=1 Next reset to &W1 settings
Internal Only
n=2 Next Reset to &F0 settings
n=3 Next Reset to &F1 settings
n=3 Next Reset to &F1 settings
�
ATZn
n=0 Dipswitch #7 determines reset
n=1 Reset to &W0 settings
n=2 Reset to &W1 settings
n=3 Reset to &F0 settings
n=4 Reset to &F1 settings
n=5 Reset to &F2 settings
Dipswitch is USR only
AT\Nn
n=0 Normal connection using flow
control
n=1 Direct connection, no flow control
n=2 LAPM/MNP 5,4,3, 2 (Reliable)
n=3 Autoreliable mode (LAPM or MNP)
n=4 LAPM reliable mode
n=5 MNP reliable mode
Operating Mode
AT\S
Display configuration information
Optional feature #146.
S Registers
S Registers
Options
Details
S000=n
n=1-255, number of rings before the
modem answers a call
�
S001
Ring counter, range=0-255
�
S002=n
Escape code, range=0-255
default=43 “+”. Anything greater than 127 disables escape
S003=n
range=0-127, default is 13
Carriage Return
S004=n
range 0-127, default is 10
Line feed
S005=n
range 0-32, default is 8
Backspace
S006=n
range 2-255, default 2 or 4
Time to wait to blind dial, units=seconds
S007=n
range 1-255, default=2
Time to wait for carrier, units=seconds
S008=n
range=0-255, default=2
Pause time for comma, units=seconds
S009=n
range=1-255, default=6
Time to wait before recognizing carrier
units=1/10 seconds
S010=n
range=1-255, default=14
Delay from lost carrier to hang up
units=1/10 seconds
S011=n
range=50-255, default= 70 or 95
DTMF tone duration/spacing
units=1/1000 seconds
S012=n
range=0-255, default=5
Escape code guard time
units =1/100 seconds
S018=n
Range: 0-255 seconds, Default: 0
Test Timer. Sets the length of time, in seconds, that the modem conducts a test (commanded by &Tn) before
returning to the command mode. If this register value is zero, the test will not automatically
terminate; the test must be terminated from the command mode by issuing an &T0 or H command.
When S18 is non-zero, the modem returns the OK message upon test termination.
S025=n
range=0-255, default=1
Delay to DTR, units=1/100 seconds
S026=n
range=0-255, default=5
RTS to CTS delay, units=1/100 seconds
S030=n
range=0-255, default=0
Disconnect inactivity timer
units=tens of seconds
S032=n
range=0-255, default=19
XON charachter
S033=n
range=0-255, default=19
XOFF charachter
S036=n
n=0 Disconnect
n=1 Establish a direct connection
n=3 Establish a normal connection
n=4 Establish an MNP connection if
possible, otherwise direct
n=5 Establish an MNP connection if
possible, otherwise normal
Negotiation failure treatment
S037=n
n=0 Rate of last AT command issue, or
modem default (maximum)
n=1 300bps
n=5 1200bps
n=6 2400bps
n=8 4800bps
n=9 9600bps
n=10 12,000bps
n=11 14,400bps
n=12 28,800bps
Desired line speed. Ignored unless N=0, overridden by +MS setting.
V.25 only, optional feature #120
default=1. Settings are bit values expressed in decimal
S086=n
n=0 Normal disconnect, no error
n=4 Loss of carrier
n=5 V.42 negotiation failed
n=9 Modems could not find common
protocol
n=12 Normal disconnect initiated by
remote modem
n=13 Remote modem did not respond
after 10 re-transmissions
n=14 Protocol violation
Connection failure cause code register
S095=n
n=0 CONNECT XXXX shows DCE
n=1 Append/ARQ to verbose code if
protocol is not NONE
n=2 Enable CARRIER XXXX result
n=3 Enable PROTOCOL XXXX result
n=4 Reserved
n=5 Enable COMPRESSION result
n=6 Reserved
n=7 Enable RINGING response
V.34 Rockwell Extended result codes
S091=n
�
PSTN transit level
S095=n
n=0 Disable COMPRESSION XXXX
n=32 Enable result code
V.32 & V.32bis range of available modem speeds. Lowest speed to start of training/ negotiation.
S110=n
n=0 V.32 no rate adjustment
n=1 V.32/V.32bis no rate adjustment
n=2 V.32/V.32bis with rate adjustment
n=3 start negotiation at lowest possible
speed as set in +MS command
n=14 V.34, V.FC, V.32bis with rate
adjustment