TAGnology_TAGid -125kHz_Protocol.pdf - RFID Webshop

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Transponders Rev. 1.2 February 1999 4 Transponders 4.1 HITAG 1 Transponders 4.1.1 Memory Organization The 2 kBit EEPROM memory on the transponder is divided into 16 blocks. Every block consists of 4 pages. A page is the smallest access unit. Every page consists of 4 bytes (at 8 bits). Block access is only available for Blocks 2-15, page access is available for Pages 0-63. secret secret or public public Block 0 Block 1 Block 4 Block 7 Block 8 user data user data user data r/w or OTP r/w public secret ro r/w wo OTP 0 Serial Number Configuration Key A Key B Logdata 1B Logdata 0A Logdata 1A Logdata 0B wo or 0 r/w or 0 read only read/write write only onetimeprogrammable neither read nor write Block 15 Configuration of the memory is done in the configuration page Areas (or settings) with light dark background may be configured by the OEM client using the Configuration Page (Page 1). Memory locations marked with "secret" can only be accessed after a mutual authentication. An enciphered data communication is used in that area. Memory locations marked with "public" can be accessed without mutual authentication, no encryption is used. Block 0 includes the unique serial number (programmed during the production process), the Configuration Page (configuration of the memory area) and the keys, Block 1 includes the logdata. Protokoll HTRM801 V1.2/C Page 84 (107)
February 1999 Rev. 1.2 Transponders Blocks 4 to 7 can be used either as secret or public areas (configurable), and Blocks 2 to 7 either as read / write or read only areas (configurable). You can also modify keys and logdata and prevent them from being accessed. Finally the Configuration Page itself can be set to read only. It is extremely important to be particularly careful when using the Configuration Page (it only can be set to read only once!), keys and logdata as you can lose access to the secret area on the transponder if you make a mistake. ATTENTION: Changing of the Configuration Page (Page 1), Keys and Logdata must be done in secure environment. The transponder must not be moved out of the communication field of the antenna during programming! We recommend to put the transponder close to the antenna (zero-distance) and not to remove it during programming. 4.1.2 Anticollision Anticollision Mode in Long Range applications including HITAG 1 transponders permits you to process several transponders simultaneously. Theoretically up to 232 transponders can be processed simultaneously. In practice this number is limited, because of the mutual influence of the transponders - they detune each other, if there are too many too close to each other. In Proximity applications only one transponder is handled even if there are several transponders within the communication field of the antenna. In this case either no communication takes place or the "stronger" or closer transponder takes over. By muting a selected transponder (HALT Mode) another transponder that is to be found in the communication field of the antenna can be recognized. Page 85 (107) Protokoll HTRM801 V1.2/C
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