owfs man page

owfs.conf — owfs programs configuration file


An OWFS configuration file is specified on the command line:

owfs -c config_file [other options]

The file name is arbitrary, there is no default configuration file used.


A configuration file can be invoked for any of the OWFS programs ( owfs (1) owhttpd (1) owserver (1) owftpd (1) ) or any of the language bindings ( owperl (1) owcapi (1) owtcl (1) owphp owpython ) to set command line parameters.


Similar to Unix shell script or perl syntax


# Any # marks the start of a comment
# blank lines are ignored


option # some options (like 'foreground') take no values
option = value # other options need a value
option value # '=' can be omitted if whitespace separates
Option # Case is ignored (for options, not values)
opt # non-ambiguous abbreviation allowed
-opt --opt # hyphens ignored


server: opt = value # only owserver effected by this line
! server: opt = value # owserver NOT effected by this line


http: opt = value # only owhttpd effected by this line
! http: opt = value # owhttpd NOT effected by this line


ftp: opt = value # only owftpd effected by this line
! ftp: opt = value # owftpd NOT effected by this line


owfs: opt = value # only owfs effected by this line
! owfs: opt = value # owfs NOT effected by this line


# maximum line length of 250 characters
# no limit on number of lines



1-wire is a wiring protocol and series of devices designed and manufactured by Dallas Semiconductor, Inc. The bus is a low-power low-speed low-connector scheme where the data line can also provide power.

Each device is uniquely and unalterably numbered during manufacture. There are a wide variety of devices, including memory, sensors (humidity, temperature, voltage, contact, current), switches, timers and data loggers. More complex devices (like thermocouple sensors) can be built with these basic devices. There are also 1-wire devices that have encryption included.

The 1-wire scheme uses a single bus master and multiple slaves on the same wire. The bus master initiates all communication. The slaves can be  individually discovered and addressed using their unique Id.

Bus masters come in a variety of configurations including serial, parallel, i2c, network or USB adapters.

OWFS design

OWFS is a suite of programs that designed to make the 1-wire bus and its devices easily accessible. The underlying principle is to create a virtual filesystem, with the unique Id being the directory, and the individual properties of the device are represented as simple files that can be read and written.

Details of the individual slave or master design are hidden behind a consistent interface. The goal is to  provide an easy set of tools for a software designer to create monitoring or control applications. There  are some performance enhancements in the implementation, including data caching, parallel access to bus  masters, and aggregation of device communication. Still the fundemental goal has been ease of use, flexibility  and correctness rather than speed.


owfs.conf (5) allows a uniform set of command line parameters to be set.

Not all OWFS programs use the same command line options, but the non-relevant ones will be ignored.

Command line and configuration options can mixed. They will be invoked in the order presented. Left to right for the command line. Top to bottom for the configuration file.

Configuration files can call other configuration files. There is an arbitrary depth of 5 levels to prevent infinite loops. More than one configuration file can be specified.


Here is a sample configuration file with all the possible parameters included.

# Sources
device = /dev/ttyS0 # serial port: DS9097U DS9097 ECLO or LINK
device = /dev/i2c-0 # i2c port: DS2482-100 or DS2482-800
usb #       USB device: DS9490 PuceBaboon
usb = 2 #   Second DS9490
usb = all # All DS9490s
altUSB # Willy Robison's tweaks
LINK = /dev/ttyS0 #     serial LINK in ascii mode
LINK = [address:]port # LINK-HUB-E (tcp access)
HA7 # HA7Net autodiscovery mode
HA7 = address[:port] # HA7Net at tcp address (port 80)
etherweather = address[:port] # Etherweather device
server = [address:]port # owserver tcp address
FAKE = 10,1B # Random simulated device with family codes (hex)
TESTER = 28,3E # Predictable simulated device with family codes
# Sinks
# # owfs specific
mountpoint = filelocation # FUSE mount point
allow_other # Short hand for FUSE mount option "
# # owhttpd owserver owftpd specific
port = [address:]port # tcp out port
# Temperature scales
Celsius # default
# Timeouts (all in seconds)
#                    cache for values that change on their own
timeout_volatile = value # seconds "volatile" values remain in cache
#                    cache for values that change on command
timeout_stable = value # seconds "stable" values remain in cache
#                    cache for directory lists (non-alarm)
timeout_directory = value # seconds "directory" values remain in cache
#                    cache for 1-wire device location
timeout_presence = value # seconds "device presence" (which bus)
timeout_serial = value # seconds to wait for serial response
timeout_usb = value # seconds to wait for USB response
timeout_network = value # seconds to wait for tcp/ip response
timeout_ftp = value # seconds inactivity before closing ftp session
# Process control
configuration = filename # file (like this) of program options
pid_file = filename # file to store PID number
background # default
readonly # prevent changing 1-wire device contents
write # default
error_print = 0-3 # 0-mixed 1-syslog 2-stderr 3-suppressed
error_level = 0-9 # increasing noise
# zeroconf / Bonjour
zero #   turn on zeroconf announcement (default)
nozero #   turn off zeroconf announcement
annouce = name  # name of announced service (optional)
autoserver #   Add owservers descovered by zeroconf/Bonjour
noautoserver #   Don't use zeroconf/Bonjour owservers (default)
# tcp persistence
timeout_persistent_low = 600 # minimum time a persistent socket will stay open
timeout_persistent_high = 3600 # max time an idle client socket will stay around

# Display
format = f[.]i[[.]c] # 1-wire address f amily i d code c rc
# Cache
cache_size = 1000000 # maximum cache size (in bytes) or 0 for no limit (default 0) #
# Information
# (silly in a configuration file)

See Also


owfs (1) owhttpd (1) owftpd (1) owserver (1) owdir (1) owread (1) owwrite (1) owpresent (1) owtap (1)

Configuration and testing

owfs (5) owtap (1) owmon (1)

Language bindings

owtcl (3) owperl (3) owcapi (3)


DS1427 (3) DS1904(3) DS1994 (3) DS2404 (3) DS2404S (3) DS2415 (3) DS2417 (3)


DS2401 (3) DS2411 (3) DS1990A (3)


DS1982 (3) DS1985 (3) DS1986 (3) DS1991 (3) DS1992 (3) DS1993 (3) DS1995 (3) DS1996 (3) DS2430A (3) DS2431 (3) DS2433 (3) DS2502 (3) DS2506 (3) DS28E04 (3) DS28EC20 (3)


DS2405 (3) DS2406 (3) DS2408 (3) DS2409 (3) DS2413 (3) DS28EA00 (3)


DS1822 (3) DS1825 (3) DS1820 (3) DS18B20 (3) DS18S20 (3) DS1920 (3) DS1921 (3) DS1821 (3) DS28EA00 (3) DS28E04 (3)


DS1922 (3)


DS2450 (3)


DS2890 (3)

Multifunction (current, voltage, temperature)

DS2436 (3) DS2437 (3) DS2438 (3) DS2751 (3) DS2755 (3) DS2756 (3) DS2760 (3) DS2770 (3) DS2780 (3) DS2781 (3) DS2788 (3) DS2784 (3)


DS2423 (3)

LCD Screen

LCD (3) DS2408 (3)


DS1977 (3)


DS2406 (3) -- TAI8570




Paul Alfille (paul.alfille@gmail.com)

Referenced By

DS1821(3), DS1822(3), DS1825(3), DS18B20(3), DS18S20(3), DS1921(3), DS1963L(3), DS1963S(3), DS1977(3), DS1991(3), DS1992(3), DS1993(3), DS1995(3), DS1996(3), DS2401(3), DS2404(3), DS2405(3), DS2406(3), DS2408(3), DS2409(3), DS2413(3), DS2415(3), DS2423(3), DS2430A(3), DS2431(3), DS2433(3), DS2436(3), DS2437(3), DS2438(3), DS2450(3), DS2502(3), DS2505(3), DS2506(3), DS2720(3), DS2740(3), DS2751(3), DS2755(3), DS2760(3), DS2770(3), DS2780(3), DS2781(3), DS2890(3), DS28E04(3), DS28EA00(3), DS28EC20(3), EDS(3), EEEF(3), LCD(3), mAM001(3), mCM001(3), mDI001(3), mRS001(3), owcapi(1), owfs(1), owftpd(1), owhttpd(1), owmon(1), ownet(1), owperl(3), owserver(1), owshell(1), owtap(1), owtcl(n).

owfs.conf(5) is an alias of owfs(5).

2006 OWFS Configuration File Manpage One-Wire File System