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DS1977(3) One-Wire File System DS1977(3) NAME DS1977 - Password Protected 32kbit Memory iButton SYNOPSIS Non-volatile memory. 37 [.]XXXXXXXXXXXX[XX][/[ memory | pages/page.[0-510|ALL] | set_num- ber/full | set_number/read | set_password/enabled | set_password/full | set_password/read | use_number/full | use_number/read | use_pass- word/full | use_password/read | address | crc8 | id | locator | r_ad- dress | r_id | r_locator | type ]] FAMILY CODE 37 DS1977 SPECIAL PROPERTIES memory read-write, binary 32704 bytes of memory. Possibly protected by a password. pages/page.0 ... pages/page.510 pages/page.ALL read-write, binary Memory is split into 511 pages of 64 bytes each. ALL is an aggregate of the pages. Each page is accessed sequentially. set_number/full set_number/read write-only, ascii Passwords entered as numbers, either decimal, or hex of form 0x0123456789ABCDEF. Handled the same as set_password/xxx set_password/enable read-write, yes-no Turn on/off password protection for the DS1977, or return the current state. set_password/full set_password/read write-only, binary Passwords (8 byte values) that allow read or full access to the DS1977 memory. The password set by set_password/xxx are stored in the DS1977 and locally in the program as well (as if use_password/xxx was also called). use_password/full use_password/read write-only, binary Passwords (8 byte values) that allow read or full access to the DS1977 memory. The password set by use_number/full use_number/read write-only, ascii Passwords entered as numbers, either decimal, or hex of form 0x0123456789ABCDEF. Handled the same as use_password/xxx use_password/full use_password/read write-only, binary Passwords (8 byte values) that allow read or full access to the DS1977 memory. The password set by use_password/xxx are stored in the program and must match the passwords stored in the DS1977. Changing the DS1977 passwords using set_password/xxx will change these values as well. use_password/xxx are stored in the program and must match the passwords stored in the DS1977. Changing the DS1977 passwords using set_pass- word/xxx will change these values as well. 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 None. 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. DS1977 The DS1977 (3) is an iButton with static memory that is optionally pro- tected by a password. 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/DS1977.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 DS1977(3)
NAME | SYNOPSIS | FAMILY CODE | SPECIAL PROPERTIES | STANDARD PROPERTIES | ALARMS | DESCRIPTION | ADDRESSING | DATASHEET | SEE ALSO | AVAILABILITY | AUTHOR
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