FreeBSD Manual Pages
DS2409(3) One-Wire File System DS2409(3) NAME DS2409 - MicroLAN Coupler SYNOPSIS 1-wire network branch controller. 1F [.]XXXXXXXXXXXX[XX][/[ aux | branch.[0|1|ALL|BYTE] | control | dis- charge | 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-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 proper- ties 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. 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 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. 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). 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. 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, main is bit 0. It is an atomic operation. STANDARD PROPERTIES address r_address 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. crc8 read-only, ascii The 8-bit error correction portion. Uses cyclic redundancy check. Com- puted from the preceding 56 bits of the unique ID number. Given as up- per case hexadecimal digits (0-9A-F). family read-only, ascii The 8-bit family code. Unique to each type of device. Given as upper case hexadecimal digits (0-9A-F). id 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 hexadecimal digits (0-9A-F). r id is the id in reverse order, which is often used in other applica- tions 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 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. 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 manufac- tured 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 en- cryption 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, par- allel, 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 in- dividual 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 com- munication. Still the fundamental goal has been ease of use, flexibil- ity 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 ex- plicitly. 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 hexadecimal, 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) 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) In- fernoEmbedded (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 (3) EDS0066 (3) EDS0068 (3) Moisture EEEF (3) DS2438 (3) AVAILABILITY http://www.owfs.org AUTHOR Paul Alfille (paul.alfille@gmail.com) OWFS Manpage 2003 DS2409(3)
NAME | SYNOPSIS | FAMILY CODE | SPECIAL PROPERTIES | STANDARD PROPERTIES | ALARMS | DESCRIPTION | ADDRESSING | DATASHEET | SEE ALSO | AVAILABILITY | AUTHOR
Want to link to this manual page? Use this URL:
<https://man.freebsd.org/cgi/man.cgi?query=DS2409&sektion=3&manpath=FreeBSD+Ports+15.0>