OWSHELL(1) One-Wire File System OWSHELL(1)
NAME
owdir, owread, owwrite, owget, owpresent - lightweight owserver access
SYNOPSIS
Minimal options
owdir -s [host:]port [directory]
owread -s [host:]port filepath
owwrite -s [host:]port filepath value
owget -s [host:]port [directory] | filepath
Server discovery
owdir --autoserver [directory]
owread --autoserver filepath
owwrite --autoserver filepath value
owget --autoserver [directory] | filepath
Full options
owdir -q --quiet -f --format f[.]i[[.]c] ] [ --dir ] -s [host:]port [directory] [directory2 ...]
owread -q --quiet -C --celsius -K --kelvin -F --fahrenheit -R --rankine [ --hex ] [ --start= offset ] [ --size= bytes ] -s [host:]port
filepath [filepath2 ...]
owwrite -q --quiet -C --celsius -K --kelvin -F --fahrenheit -R --rankine [ --hex ] [ --start= offset ] -s [host:]port filepath value
[filepath2 value2 ...]
owget -q --quiet -f --format f[.]i[[.]c] -C --celsius -K --kelvin -F --fahrenheit -R --rankine [ --hex ] [ --start= offset ] [ --size=
bytes ] [ --dir ] -s [host:]port [directory] | filepath
Version
owdir -V --version
owread -V --version
owwrite -V --version
owget -V --version
Help
owdir -h | --help
owread -h | --help
owwrite -h | --help
owget -h | --help
DESCRIPTION
1-Wire
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 (humid-
ity, 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 priciple 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.
OWSHELL programs
owdir owread owwrite and owget are collectively called the owshell programs. They allow lightweight access to an owserver (1) for use in
command line scripts.
Unlike owserver (1) owhttpd (1) owftpd (1) owhttpd (1) there is not persistent connection with the 1-wire bus, no caching and no multi-
threading. Instead, each program connects to a running owserver (1) and performs a quick set of queries.
owserver (1) performs the actual 1-wire connection (to physical 1-wire busses or other /.B owserver programs), performs concurrency lock-
ing, caching, and error collection.
owshell programs are intended for use in command line scripts. An alternative approach is to mount an owfs (1) filesystem and perform
direct file lists, reads and writes.
owdir
owdir performs a directory listing. With no argument, all the devices on the main 1-wire bus will be listed. Given the name of a 1-wire
device, the available properties will be listed. It is the equivalent of
ls directory
in the owfs (1) filesystem.
owread
owread obtains for value of a 1-wire device property. e.g. 28.0080BE21AA00/temperature gives the DS18B20 temperature. It is the equivalent
of
cat filepath
in the owfs (1) filesystem.
owwrite
owwrite performs a change of a property, changing a 1-wire device setting or writing to memory. It is the equivalent of
echo value > filepath
in the owfs (1) filesystem.
owget
owget (1) is a convenience program, combining the function of owdir (1) and owread (1) by first trying to read the argument as a directory,
and if that fails as a 1-wire property.
STANDARD OPTIONS
--autoserver
Find an owserver using the Service Discovery protocol. Essentially Apple's Bonjour (aka zeroconf). Only the first owserver will be used,
and that choice is probably arbitrary.
-s [host:]port
Connect via tcp (network) to an owserver process that is connected to a physical 1-wire bus. This allows multiple processes to share the
same bus. The owserver process can be local or remote.
If the server option is not specified, the default is the local machine and the IANA allocated default port of 4304. Thus "-s local-
host:4304" is the equivalent.
DATA OPTIONS
--hex
Hexidecimal mode. For reading data, each byte of character will be displayed as two characrters 0-9ABCDEF. Most useful for reading memory
locations. No spaces between data.
Writing data in hexidecimal mode just means that the data should be given as one long hexidecimal string.
--start=offset
Read or write memory locations starting at the offset byte rather than the beginning. An offset of 0 means the beginning (and is the
default).
--size=bytes
Read up to the specified number of bytes of a memory location.
HELP OPTIONS
-h --help
Shows (this) basic summary of options.
-V --version
Version of this program.
DISPLAY OPTIONS
--dir
Modify the display of directories to indicate which entries are also directories. A directory member will have a trailing '/' if it is a
directory itself. This aids recursive searches.
-f --format f[.]i[[.]c]
Display format for the 1-wire devices. Each device has a 8 byte address, consisting of:
f family code, 1 byte
i ID number, 6 bytes
c CRC checksum, 1 byte
Possible formats are f.i (default, 01.A1B2C3D4E5F6), fi fic f.ic f.i.c and fi.c
All formats are accepted as input, but the output will be in the specified format.
EXAMPLE
owdir -s 3000 --format fic
Get the device listing (full 16 hex digits, no dots) from the local owserver at port 3000
owread -F --autoserver 51.125499A32000/typeK/temperature
Read temperature from the DS2751-based thermocouple on an auto-discovered owserver Temperature in fahrenheit.
owwrite -s 10.0.1.2:3001 32.000800AD23110/pages/page.1 "Passed"
Connect to a OWFS server process ( owserver ) that was started on another machine at tcp port 3001 and write to the memory of a
DS2780
SEE ALSO
Programs
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)
Clocks
DS1427 (3) DS1904(3) DS1994 (3) DS2404 (3) DS2404S (3) DS2415 (3) DS2417 (3)
ID
DS2401 (3) DS2411 (3) DS1990A (3)
Memory
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)
Switches
DS2405 (3) DS2406 (3) DS2408 (3) DS2409 (3) DS2413 (3) DS28EA00 (3)
Temperature
DS1822 (3) DS1825 (3) DS1820 (3) DS18B20 (3) DS18S20 (3) DS1920 (3) DS1921 (3) DS1821 (3) DS28EA00 (3) DS28E04 (3)
Humidity
DS1922 (3)
Voltage
DS2450 (3)
Resistance
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)
Counter
DS2423 (3)
LCD Screen
LCD (3) DS2408 (3)
Crypto
DS1977 (3)
Pressure
DS2406 (3) -- TAI8570
AVAILABILITY
http://www.owfs.org
AUTHOR
Paul Alfille (paul.alfille@gmail.com)
OWSHELL Manpage 2004 OWSHELL(1)