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The Hayes AT command set
AT - ATtention command defines baud rate and precedes common line
A/ - Re-executes the last command line if modem has not made a connection
A - Modem goes off-hook in answer mode.
B0 - Sets CCIT V.22 operation when at 1200 baud
B1 - Sets Bell 212A operation when at 1200 baud
C0 - Sets transmit carrier off
C1 - Sets transmit carrier on
D - Dial number following D in command line
E0 - Modem does not echo commands back to the terminal
E1 - Modem echoes commands back to the terminal
F0 - Sets modem to half duplex
F1 - Sets modem to full duplex
H0 - Modem goes on-hook (hangs up).
H1 - Enables switchhook and auxilary relay
I0 - Displays the product Identification Code
I1 - Performs checksum on firmware ROM and displays the value
I2 - Performs checksum on firmware ROM and returns Error or OK
L1 - Speaker volume low
L2 - Speaker volume medium
L3 - Speaker volume high
M0 - Speaker off
M1 - Speaker on until carrier detected
M2 - Speaker always on
M3 - Speaker on until carrier detected except when dialing
O0 - Return to on-line
O1 - Return to on-line with retrain
Q0 - Modem returns result codes
Q1 - Modem deos not display result codes
Sr=n - Set S register r to value n
Sr? - Display contents of S register
V0 - Short numeric result codes
V1 - Full result codes
X0 - CONNECT, result codes enabled
X1 - CONNECT BBBB result codes enabled, blind dial,
busy signal not detected
X2 - Modem waits for dial tone before dialing, all CONNECT BBB result
codes enabled, busy signal not detected
X3 - Modem blind dials, all CONNECT BBBB results codes enabled,
modem sends BUSY if busy signal is detected
X4 - Modem waits for dial tone before dialing, all CONNECT BBBB results
codes enabled, modem sends BUSY if busy signal is detected
Y0 - Long space disconnect disabled
Y1 - Long space disconnect enabled
Z - Load stored profile configuration
&C0 - DCD always ON
&C1 - DCD ON if data carrier is present
&D0 - Modem ignores DTR
&D1 - Modem assumes command state with an ON-to-OFF transition on DTR
&D2 - Modem hangs up, assumes command state and disables auto
answer oncce detecting ON-to-OFF transition on DTR
&D3 - Modem assumes initialization state with an ON-to-OFF
transition to DTR
&F - Load factory profile configuration
&G0 - No guard tone
&G1 - 550 Hz guard tone
&G2 - 1800 Hz guard tone
&L0 - Selects dialup line
&L1 - Selects leased line
&P0 - Pulse dial make/break ratio 39/61 (USA/Canada)
&P1 - Pulse dial make/break ratio 33/67 (UK/HK)
&R0 - CTS follows RTS
&R1 - Modem ignores RTS. CTS is always on
&S0 - DSR is always ON
&S1 - DSR is compatible with EIA RS-232C
&T0 - Ends a test in progress
&T1 - Initiate Local Analog Loopbacl Test
&T2 - RESERVED
&T3 - Initiate Digital Loopback
&T4 - Grants Request from remote modem for Digital Loopback
&T5 - Denies Request from remote modem for Digital Loopback
&T6 - Initiate Remote Digital Loopback Test
&T7 - Initiate Remote Digital Loopback Test with Self Test
&T8 - Initiate Local Analog Loopback Test with Self Test
&W - Write present profile configuration to nonvolatile RAM
&Z - Stores a phone number in nonvolatile RAM
S - Registers
S0 - Ring to answer 0-255 rings default:0
S1 - Number of rings 0-255 rings default:0
S2 - Escape character 0-127 ASCII default:43(+)
S3 - Carriage Return 0-127 ASCII default:13(CR)
S4 - Line Feed 0-127 ASCII default:10(LF)
S5 - Back Space 0-127 ASCII default:8(BS)
S6 - Wait for dial tone 2-255 seconds default:2
S7 - Wait for carrier 1-255 seconds default:30
S8 - Comma pause time 0-255 seconds default:2
S9 - Carrier response 1-255 .1 sec. default:6
S10 - Carrier loss delay 1-255 .1 sec. default:7
S11 - Tone duration 50-255 msec. default:70
S12 - Escape guard time 20-255 .02 sec default:50
S13 - Bit mapped UART status register
S14 - Bit mapped Option register
S15 - Bit mapped Flag register
S16 - Bit mapped Test options
S Registers above S16 are generally not used by 1200 baud modems
S17 - RESERVED
S18 - Test times 1-255 seconds default:0
S19 - RESERVED
S20 - RESERVED
S21 - Bit mapped
S22 - Bit mapped
S23 - Bit mapped
S24 - RESERVED
S25 - Delay to DTR 0-255 .01 sec. default:5
S26 - RTS to CTS delay 0-255 .01 sec. default:1
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