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List of Hayes modem commands
============= 2400B HAYES MODEM COMMANDS LIST =============
Here is a list of the S-registers used by Hayes modem. Please be aware
that not all modems support these registers and that some modems may
have more registers than are listed.
ALL S REGISTER COMMANDS ARE ENTERED IN THE AT COMMAND LINE.
EXAMPLE: AT S8=2 S2=43 S7=30
TO READ THE VALUE IN ANY REGISTER USE
AT SX? <CR>
THE MODEM SHOULD ECHO THE VALUE FOUND IN THE REGISTER X
REG Values Register function
S0 0 AUTO ANSWER OFF
1-255 AUTO ANSWER ON, ANSWER ON INDICATED # OF RINGS
S1 **0-255 RING COUNT (THIS IS A READ-ONLY REGISTER)
S2 0-127 ESCAPE CHARACTER NORMALLY SET TO 43 OR "+"
127-255 ESCAPE FUNCTION DISABLED
S3 0-127 END OF LINE CHARACTER NORMALLY SET TO 13 (CR)
S4 0-127 LINE FEED CHARACTER NORMALLY SET TO 10 (LF)
S5 0-127 BACKSPACE CHARACTER NORMALLY SET TO 8 (BS)
S6 2-255 SEC PAUSE BEFORE DIALING (NORMALLY 2 SEC)
S7 1-255 SEC WAIT FOR CARRIER (NORMALLY SET TO 30 SEC)
S8 0-255 SEC PAUSE FOR COMMA IN DIAL STRING (NORMALLY SET TO 2 SEC)
S9 1-255 .1SEC CARRIER VALIDATION TIME NORMALLY 6 (.6 SEC)
S10 1-255 .1SEC LOSS OF CARRIER DISCONNECT DELAY NORMALLY 14 (1.4 SEC)
S11 50-90 .1SEC BETWEEN NUMBER DIAL DELAY. UNDOCUMENTED. IMPROVE DIAL
SPEED. I LIKE 55. THE DEFAULT IS 90.
S12 20-255 .02SE ESCAPE SEQENCE PAUSE NORMALLY 50 (1.0 SEC)
S13 * POWER UP ASYNC DATA FORMAT (USE CHART BELOW)
S14 * OPTION STATUS (USE CHART BELOW)
S16 * TEST STATUS (USE CHART BELOW)
S18 0-255 SEC TEST TIMER (REMOTE TEST)
S21 * OPTION STATUS (USE CHART BELOW)
S22 * OPTION STATUS (USE CHART BELOW)
S23 * OPTION STATUS NORMALLY 07 (USE CHART BELOW)
S25 0-255 SEC DTR DETECT DELAY NORMALLY 5 SEC
ASYNC MODE, SYIC AUTO-DIAL AND SYIC MANUAL DIAL MODE .05 SEC
S26 0-255 MS RTS TO CTS DELAY (1 MS)
S27 * OPTION STATUS (USE CHART BELOW)
* REGISTERS USED BY MODEM PROCESSOR. DO NOT ALTER THESE
** READ ONLY REGISTERS
S13 DATA FORMAT:
POSITION VALUE FUNCTION
BIT 0 - NOT USED
BIT 1 - NOT USED
BIT 2 0 PARITY OFF
1 PARITY ON
BIT 3 0 ODD PARITY
1 EVEN PARITY
BIT 4 0 7 DATA BITS
1 8 DATA BITS
BIT 5 0 BIT 8=0
1 BIT 8=1
BIT 6 - NOT USED
BIT 7 - NOT USED
S14 DATA FORMAT:
BIT 0 - NOT USED
BIT 1 0 LOCAL CHARACTER ECHO OFF
1 LOCAL CHARACTER ECHO ON
BIT 2 0 STATUS DISPLAYS ON
1 STATUS DISPLAYS OFF
BIT 3 0 STATUS CODES SENT
1 STATUS MESSAGES SENT
BIT 4 0 MODEM RESPONDS TO COMMANDS
1 MODEM IGNORES COMMANDS
BIT 5 0 TONE-DIALING
1 PULSE-DIALING
BIT 6 - NOT USED
BIT 7 0 ANSWER MODE
1 ORIGINATE MODE
S16 DATA FORMAT:
BIT 0 0 ANALOG LOOP OFF
1 ANALOG LOOP ACTIVE
BIT 1 - NOT USED
BIT 2 0 DIGITAL LOOP OFF
1 DIGITAL LOOP ACTIVE
BIT 3 0 REMOTE DIGITAL LOOP REQUESTED BY OTHER MODEM IS OFF
1 REMOTE DIGITAL LOOP REQUESTED BY OTHER MODEM IS ACTIVE
BIT 4 0 REMOTE DIGITAL LOOP OFF
1 REMOTE DIGITAL LOOP ACTIVE
BIT 5 0 SELF TEST RDL OFF
1 SELF TEST RDL ACTIVE
BIT 6 0 SELF TEST ANALOG LOOP OFF
1 SELF TEST ANALOG LOOP ACTIVE
BIT 7 - NOT USED
S21 DATA FORMAT:
BIT 0 0 RJ11/RJ41/45 JACK TYPE
1 RJ12/FJ13 JACK TYPE
BIT 1 - NOT USED
BIT 2 0 CTS FOLLOWS RTS
1 CTS FORCED ON
BIT 3&4 0 MODEM IGNORES DTR
1 MODEM ASSUMES COMMAND STATE WHEN DTR TURNS OFF
2 MODEM ASSUMES COMMAND STATE AND DISABLES AUTO-ANSWER
WHEN DTR TURNS OFF
3 MODEM RESETS WHEN DTR TURNS OFF
BIT 5 0 DCD FORCED ON
1 DCD FOLLOWS CARRIER
BIT 6 0 DSR FORCED ON
1 DSR BEHAVES NORMALLY
BIT 7 0 LONG SPACE DISCONNECT DISABLED
1 LONG SPACE DISCONNECT ENABLED
S22 DATA FORMAT:
BIT 0&1 1 LOW SPEAKER VOLUME
2 MEDIUM SPEAKER VOLUME
3 HIGH SPEAKER VOLUME
BIT 2&3 0 SPEAKER ALWAYS OFF
1 SPEAKER ON UNTIL CARRIER DETECTED
2 SPEAKER ALWAYS ON
3 SPEAKER OFF DURING DIALING THEN ON UNTIL CARRIER DETECTED
BIT 4&5&6 0 X COMMAND IN EFFECT
4 X 1 COMMAND IN EFFECT
5 X 2 COMMAND IN EFFECT
6 X 3 COMMAND IN EFFECT
7 X 4 COMMAND IN EFFECT
BIT 7 0 39/61 MAKE/BREAK RATIO (PULSE DIALING)
1 33/67 MAKE/BREAK RATIO
S23 DATA FORMAT:
BIT 0 0 REMOTE DIGITAL LOOP REQUEST DENIED
1 REMOTE DIGITAL LOOP REQUEST GRANTED
BIT 1&2 0 0-300 BPS
1 600 BPS
2 1200 BPS
3 2400 BPS
BIT 3 - NOT USED
BIT 4&5 0 EVEN PARITY
1 PARITY BIT ALWAYS 0
2 ODD PARITY
3 PARITY BIT ALWAYS 1
BIT 6&7 0 NO GUARD TONES
1 550 HZ GUARD TONE
2 1800 HZ GUARD TONE
S27 DATA FORMAT:
BIT 0&1 0 ASYNCRONOUS MODE
1 ASYNC/SYNC MODE
2 SYNC AUTO-DIAL
3 SYNC MANUAL DIAL
BIT 2 0 PUBLIC PHONE LINE
1 LEASED LINE
BIT 3 - NOT USED
BIT 4&5 0 INTERNAL CLOCK USED
1 EXTERNAL CLOCK USED
2 SLAVED CLOCK USED
BIT 6 0 CCITT V.22 PROTOCOL (1200 BPS)
1 BELL 212A (1200 BPS)
BIT 7 - NOT USED
OTHER MODEM COMMANDS:
AT STANDARD LEAD IN SEQUENCE (ATTENTION)
ATA FORCE ANSWER
ATD DIAL (ATD ###-#####)
P PULSE (ATDP ###-####)
T TONE (ATDT ###-####)
ATE1 ENABLE LOCAL CHARACTER ECHO
ATE0 DISABLE LOCAL CHARACTER ECHO
ATH1 FORCE LINE CONNECT
ATH0 FORCE LINE DISCONNECT
ATI ECHO VERSION TYPE
ATL1 SPEAKER VOLUME LOW
ATL2 SPEAKER VOLUME MEDIUM
ATL3 SPEAKER VOLUME HIGH
ATM0 SPEAKER ALWAYS OFF
ATM1 SPEAKER ON EXCEPT WHILE CARRIER PRESENT
ATM2 SPEAKER ALWAYS ON
ATM3 SPEAKER ON EXCEPT WHILE DIALING AND CARRIER PRESENT
ATO GO ONLINE AFTER ESCAPE OR WHILE IN COMMAND MODE
ATQ0 STATUS DISPLAY ON
ATQ1 STATUS DISPLAY OFF
ATV0 STATUS MESSAGES SENT
ATV1 STATUS CODES SENT
ATX0 "CONNECT" (CODE 1) ALL SPEEDS NO DIAL TONE DETECTION
ATX1 "CONNECT" (CODE 1) 0-300 BPS OR "CONNECT 1200" FOR 1200 OR
"CONNECT 2400" FOR 2400 BPS NO DIAL TONE DETECTION
ATX2 WAIT FOR DIAL TONE (CONNECT SPEEDS SHOWN AS FOR X1)
ATX3 DETECT BUSY SIGNAL (CONNECT SPEEDS SHOWS AS FOR X1)
ATX4 WAIT FOR DIAL TONE, DETECT BUSY SIGNAL (CONNECT SPEEDS SHOWS AS FOR X1)
ATZ RESET TO POWER UP CONDITION (CLEARS ALL REGISTERS)
2400 MODEM SPECIAL COMMANDS: (* = FACTORY SETTING STANDARD)
ATB0 CCITT V.22 AT 1200 BPS
ATB1 BELL 212A AT 1200 BPS *
AT &F RESTORE TO FACTORY CONFIGURATION
AT &G NO GUARD TONE *
AT &G1 550 HZ GUARD TONE
AT &G2 1800 HZ GUARD TONE
AT &J RJ11/RJ41S/RJ45 JACK *
AT &J2 RJ12/RJ13 JACK
AT &L REGULAR PHONE LINE *
AT &L1 LEASED LINE
AT &M ASYNC OPERATION *
AT &M1 ASYNC/SYNC OPERATION
AT &M2 SYNC AUTO DIAL
AT &M3 SYNC MANUAL DIAL
AT &P 39/61 PULSE MAKE/BREAK RATIO *
AT &P1 33/67 PULSE MAKE/BREAK RATIO
AT &T4 GRANT RDL TEST REQUEST *
AT &T5 DENY RDL TEST REQUEST
AT &W WRITE CURRENT REGISTERS TO NON-VOL-MEMORY (KEEP FOR POWER UP)
AT &X SYNC CLOCK INTERNAL *
AT &X1 SYNC CLOCK EXTERNAL
AT &X2 SYNC CLOCK SLAVED
AT &Z STORE DIAL COMMAND LINE
DATA INTERFACE (2400)
AT &C DCD ALWAYS ON *
AT &C1 DCD ON WHILE CARRIER PRESENT
AT &D DTR IGNORED *
AT &D1 DTR FAIL DISCONNECT ENABLED (MODEM RETURNS TO COMMAND MODE)
AT &D2 DTR FAIL DISCONNECT ENABLED (MODEM RETURNS TO COMMAND MODE, TURN
AUTO ANSWER OFF)
AT &D3 DTR FAIL DISCONNECT ENABLED (RESET MODEM)
This information provided to you by David Scheall. I can be reached at
CompuServ 71360,2662 or at GEnie by sending mail to address D.Scheall.
I hope you find this usefull!
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