| DS2409(3) | One-Wire File System | DS2409(3) |
DS2409 - MicroLAN Coupler
1-wire network branch controller.
1F [.]XXXXXXXXXXXX[XX][/[ aux | branch.[0|1|ALL|BYTE] | control | discharge | event.[0|1|ALL|BYTE] | clearevent | main | sensed.[0|1|ALL|BYTE] | address | crc8 | id | locator | r_address | r_id | r_locator | type ]]
1F
directory
This is the aux branch of the DS2409 network branch. It is
implicitly accessed (via the aux smart-on command) when it is listed
or devices on this branch are addressed.
read-write, yes-no
Writing a value of 1 to the branch properties explicitly selects the
meant branch ( 0=main or 1=aux ). Writing 0 deselects
the branch. This is an addition to the directory branch selection scheme
available by simply accessing the main and aux directories.
Both ways to select a branch coexist nicely but the latest scheme used wins.
Attempting to select both branches, either by setting both bits at the same
time or subsequently, fails. Clearing both branch selection bits, either by
clearing both bits at the same time or subsequently, resets the event flags
inside the DS2409 as a side effect. Reading the branch properties
returns which branch (if any) is connected to the master bus.
After using the directory branch selection scheme, both branches are deselected automatically.
ALL is an aggregate of the properties, comma separated. It
is an atomic operation.
BYTE is an aggregate of the branches as a byte, main is bit 0.
It is an atomic operation.
read-write, unsigned integer
Setting of the PIO control pin. There are 4 possible settings:
write-only, yes-no
Writing a non-zero value to this property will electrically reset both the
main and auxiliary branches of the 1-wire bus by dropping power for 100
milliseconds. All devices on those branches will lose parasitic power and
reset to power-up defaults. As a side effect, both event flags and
thus, the alarm state, are cleared, too.
read-only, yes-no
Has the event flag for the branch been triggered? A negative edge on
the disconnected branch ( 0=main or 1=aux ) sets the flag.
This is achieved by e.g. connecting an iButton to the branch. Value returned
is 1 (yes) or 0 (no).
After accessing the main or aux directory, both branches are deselected automatically and thus, the event flags and alarm state are cleared.
ALL is an aggregate of the properties, comma separated. It
is an atomic operation.
BYTE is an aggregate of the branches as a byte, main is bit 0.
It is an atomic operation.
write-only, yes-no
Writing a non-zero value to this property will reset both event flags
and thus, clear the alarm state, too.
directory
This is the main branch of the DS2409 network branch. It is
implicitly accessed (via the main smart-on command) when it is listed
or devices on this branch are addressed.
read-only, yes-no
Voltage sensed at the 0=main or 1=aux branch pin. Valid only
when the branch is switched out. Value returned is 0 (low) or 1 (high).
ALL is an aggregate of the properties, comma separated. It
is an atomic operation.
BYTE is an aggregate of the branches as a byte, main is bit 0.
It is an atomic operation.
read-only, ascii
The entire 64-bit unique ID. Given as upper case hexadecimal digits (0-9A-F).
address starts with the family code
r address is the address in reverse order, which is often used
in other applications and labeling.
read-only, ascii
The 8-bit error correction portion. Uses cyclic redundancy check. Computed
from the preceding 56 bits of the unique ID number. Given as upper case
hexadecimal digits (0-9A-F).
read-only, ascii
The 8-bit family code. Unique to each type of device. Given as upper
case hexadecimal digits (0-9A-F).
read-only, ascii
The 48-bit middle portion of the unique ID number. Does not include the family
code or CRC. Given as upper case hexadecimal digits (0-9A-F).
r id is the id in reverse order, which is often used in other
applications and labeling.
read-only, ascii
Uses an extension of the 1-wire design from iButtonLink company that
associated 1-wire physical connections with a unique 1-wire code. If the
connection is behind a Link Locator the locator will show a unique
8-byte number (16 character hexadecimal) starting with family code FE.
If no Link Locator is between the device and the master, the
locator field will be all FF.
r locator is the locator in reverse order.
read-only, yes-no
Is the device currently present on the 1-wire bus?
read-only, ascii
Part name assigned by Dallas Semi. E.g. DS2401 Alternative packaging
(iButton vs chip) will not be distiguished.
The DS2409 will respond to a conditional search if the main event flag is set.
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 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 fundamental goal has been ease of use, flexibility and correctness rather than speed.
The DS2409 (3) allows complex 1-wire network topology. Each branch has it's power preserved, even when isolated from the master. A separate PIO pin can be configured to show branch switching, or controlled explicitly.
All 1-wire devices are factory assigned a unique 64-bit address. This address is of the form:
Addressing under OWFS is in hexadecimal, of form:
where 01 is an example 8-bit family code, and 12345678ABC is an example 48 bit address.
The dot is optional, and the CRC code can included. If included, it must be correct.
http://pdfserv.maxim-ic.com/en/ds/DS2409.pdf
owfs (1) owhttpd (1) owftpd (1) owserver (1) owdir (1) owread (1) owwrite (1) owpresent (1) owtap (1)
owfs (5) owtap (1) owmon (1)
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) InfernoEmbedded (3)
DS1822 (3) DS1825 (3) DS1820 (3) DS18B20 (3) DS18S20 (3) DS1920 (3) DS1921 (3) DS1821 (3) DS28EA00 (3) DS28E04 (3) EDS0064 (3) EDS0065 (3) EDS0066 (3) EDS0067 (3) EDS0068 (3) EDS0071 (3) EDS0072 (3) MAX31826 (3)
DS1922 (3) DS2438 (3) EDS0065 (3) EDS0068 (3)
DS2450 (3)
DS2890 (3)
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 (3) DS2408 (3)
DS1977 (3)
DS2406 (3) TAI8570 (3) EDS0066 (3) EDS0068 (3)
EEEF (3) DS2438 (3)
http://www.owfs.org
Paul Alfille (paul.alfille@gmail.com)
| 2003 | OWFS Manpage |