NAME¶
DS2409 - MicroLAN Coupler
SYNOPSIS¶
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 ]]
FAMILY CODE¶
1F
SPECIAL PROPERTIES¶
aux¶
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.
branch.0 branch.1 branch.ALL branch.BYTE¶
read-only, yes-no
Is the branch (
0=main or
1=aux ) currently connected to the
master bus? Value returned is 1 (yes) or 0 (no). The
DS2409 should not
allow both to be on simultaneously.
ALL is an aggregate of the properties, comma separated. It is an atomic
operation.
BYTE is an aggregate of the branches as a byte, A is bit 0.
control¶
read-write, unsigned integer
Setting of the PIO
control pin. There are 4 possible settings:
- 0
- Unconditionally off (non-conducting)
- 1
- Unconditionally on (conducting)
- 2
- Auto on when main branch switched in
- 3
- Auto on when aux branch switched in
discharge¶
write-only, yes-no
Writing a non-zero value to this property will electrically reset both the main
and auxillary 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.
event.0 event.1 event.ALL event.BYTE¶
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).
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.
clearevent¶
write-only, yes-no
Writing a non-zero value to this property will reset both
event flags and
thus, clear the alarm state, too.
main¶
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.
sensed.0 sensed.1 sensed.ALL sensed.BYTE¶
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, A is bit 0.
STANDARD PROPERTIES¶
address¶
r_address¶
read-only, ascii
The entire 64-bit unique ID. Given as upper case hexidecimal 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.
crc8¶
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 hexidecimal
digits (0-9A-F).
family¶
read-only, ascii
The 8-bit family code. Unique to each
type of device. Given as upper case
hexidecimal digits (0-9A-F).
r_id¶
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 hexidecimal digits (0-9A-F).
r id is the
id in reverse order, which is often used in other
applications and labeling.
locator¶
r_locator¶
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 hexidecimal) 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.
present (DEPRECATED)¶
read-only, yes-no
Is the device currently
present on the 1-wire bus?
type¶
read-only, ascii
Part name assigned by Dallas Semi. E.g.
DS2401 Alternative packaging
(iButton vs chip) will not be distiguished.
ALARMS¶
The
DS2409 will respond to a conditional search if the
main event
flag is set.
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 (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 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.
DS2409¶
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.
ADDRESSING¶
All 1-wire devices are factory assigned a unique 64-bit address. This address is
of the form:
- Family Code
- 8 bits
- Address
- 48 bits
- CRC
- 8 bits
Addressing under OWFS is in hexidecimal, of form:
- 01.123456789ABC
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.
DATASHEET¶
http://pdfserv.maxim-ic.com/en/ds/DS2409.pdf
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)
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) EDS0064 (3) EDS0065 (3) EDS0066 (3)
EDS0067 (3) EDS0068 (3) EDS0071 (3) EDS0072 (3) MAX31826 (3)
Humidity¶
DS1922 (3) DS2438 (3) EDS0065 (3) EDS0068 (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 EDS0066 (3) EDS0068 (3)
Moisture¶
EEEF (3) DS2438 (3)
AVAILABILITY¶
http://www.owfs.org
AUTHOR¶
Paul Alfille (paul.alfille@gmail.com)