Ever found yourself needing to dig up archaic documentation on Hayes modem commands?
You might, and if you do here is a reference. It’s not often in your life you’ll need to dial up to another machine, but in those rare cases it’s nice to be able to diagnose the modem issue when it occurs.
HAYES MODEM REFERENCE
HAYES(DEV) Devices HAYES(DEV)
NAME
hayes - The hayes modems
DESCRIPTION
MISCELLANEOUS
-------------
a/ - redo last command
+++ - return to modem cmd mode from live connection
-------------------------------
--- DIALING
-------------------------------
DIAL COMMAND
------------
atdt[tele#]
ats11=75 - speed of tone dialing (in miliseconds. minimum 50)
AUTO-DIAL PHONE NUMBERS
-----------------------
at&z0[tele#] -stores a tele# in memory #0
at&z1[tele#] -stores a tele# in memory #1, etc
atd\0 - dial tele# in memory #0
SHOW ALL SETTINGS
-----------------
at&v - show all hayes command settings
-------------------------------
--- ENTER/EXIT CONNECTION STATE
-------------------------------
ANSWER/ORIGINATE MODES
----------------------
ata - manual answer incoming call
atd - originate connection. Assumes number already
dialed, remote has picked up
ONLINE RETURN
-------------
ato - go back online from +++
ato1 - return to online state and retrain baud sync
HANGUP
------
ath0 - hang up if modem off hook (esp. after a +++)
ath1 - pick up, but do nothing
RESET
-----
atz - reset modem to config profile 0
at&f - return all settings to factory settings
at&w - save current settings in non-volatile mem (?not sure)
BREAK
-----
at\b - send break
at\b3 - send a 300ms break (number is x100ms)
-------------------------------
--- SPEAKER
-------------------------------
LOUDNESS (SPEAKER)
------------------
atl1 - low speaker volume
--> atl2 - medium speaker volume
atl3 - loud speaker volume
MONITOR (SPEAKER)
-----------------
atm - speaker off
--> atm1 - speaker on until carrier detected
atm2 - speaker always on
atm3 - spkr on until carrier detected except during dialing
-------------------------------
--- MODEM RESPONSES
-------------------------------
QUIET
-----
--> atq0 - quiet off (enable messages)
atq1 - quiet on (disable messages)
VERBAL
------
atv0 - verbal off (numeric messages)
--> atv1 - verbal on (word messages)
CONNECT CODES
-------------
atx[01234] - various levels of word messages (default atx4)
ECHO
----
ate0 - no local echo
--> ate1 - local echo
-------------------------------
--- HARDWARE LINES
-------------------------------
CTS/RTS
-------
at&r0 - ignore RTS in command mode, CTS follows RTS in data mode
at&r1 - force CTS active
DCD ASSERT
----------
at&c0 - force DCD high always
at&c1 - modem asserts DCD when carrier detected
DSR ASSERT
----------
at&s0 - force DSR high always
at&s1 - modem asserts DSR (when connection established?)
DTR
---
at&d0 - ignores DTR line from computer
at&d1 - goto AT command state on DTR on->off change, (no hangup)
at&d2 - modem resets itself on DTR on->off change
-------------------------------
--- FLOW CONTROL
-------------------------------
XON/XOFF FLOW CONTROL
---------------------
at&k0 - disable local flow control
at&k1 - ?
at&k2 - ?
at&k3 - RTS/CTS bi-directional hardware flow control
at&k4 - XON/XOFF bidirectional software flow control
at&k5 - uni-directional XON/XOFF flow control
-------------------------------
--- AUTO ANSWER
-------------------------------
ats0=0 - no auto answer
ats0=1 - auto-answer on first ring
-------------------------------
--- CARRIER
-------------------------------
ats7=30 - time to wait for carrier detect before giving up
ats9=6 - recognize carrier by .6 seconds of carrier tone
ats10=10 - hangup after 1 second without carrier tone
S REGISTERS
-----------
ats0=0 - no auto answer
ats0=1 - auto-answer on first ring
ats7=30 - time to wait for carrier detect before giving up
ats9=6 - recognize carrier by .6 seconds of carrier tone
ats10=10 - hangup after 1 second without carrier tone
ats11=75 - speed of tone dialing (in miliseconds. minimum 50)
DIAL MODIFIERS
--------------
, - pause for 2 seconds (value of S7 register)
; - return to command state after dialing
! - flash the hook for 1/2 second
R - reverse to 'answer' mode after dial (@ end of tele#)
W - wait up to 30 secs for 1 sec continuous dial tone
@ - modem waits 30 secs for one or more ringbacks
RECOMMENDED SETTINGS
FOR UNIX DIALUP MODEM WITH UUGETTY
----------------------------------
at&f - return to factory settings
ats0=1 - auto answer on first ring
ats2=127 - disable +++ escape (allows binary file xmission)
atl3 - loud spkr volume
atm1 - spkr on until carrier detect
ate0 - echo off
atq1 - no messages
at&c1 - DCD active on carrier detect, inactive on hangup
at&d2 - modem resets when DTR dropped
at&s1 - DSR active (when??)
at&k0 - disable XON/XOFF flow control
at&r0 - ignore RTS in cmd mode, CTS follows RTS in data mode
at&w - save these settings
FOR UNIX DIALOUT
----------------
at&f
ats0=1 - auto answer on first ring
ats2=127 - disable +++ escape (allows binary file xmission)
atl3 - loud spkr volume
atm1 - spkr on until carrier detect
ate1 - echo on
atq0v1 - disable quiet/enable verbose messages
at&c1 - DCD active on carrier detect, inactive on hangup
at&s1 - DSR active (when??)
at&d2 - modem resets when DTR dropped
at&k0 - disable XON/XOFF flow control
at&r0 - ignore RTS in cmd mode, CTS follows RTS in data mode
at&w - save these settings
SEE ALSO
www.hayes.com - I think they have all models of modem settings
available online.
ORIGIN
Gregory Ercolano, Los Feliz California 08/28/93
The Sociopathic Mind of a Certified Eclectic 