H1W200102 Datasheet, PDF (9/10 Pages) rfsolutions.ltd – Micro RWD H1 “Wiegand” Output Version

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Method of Operation
The Micro RWD reader only allows full communication with Hitag 1 transponders if an
initial level of security has been passed. The system works by firstly reading the tag serial
number (identity code) which is the four bytes from page 0 (first page) of the tag memory.
The Micro RWD internal EEPROM is then checked to see if this serial number is stored in
the authorisation list located from byte 12 onwards. If the tag serial number is matched to a
serial number stored in the Micro RWD or the list is empty then the tag has passed the
validation test. If the Micro RWD has FF FF FF FF (hex) stored at EEPROM locations 12 to
15 then the list is treated as empty and all Hitag 1 tags are accepted through the validation
test.
Full communication is only allowed if this initial security check has been passed (or the
Micro RWD authorisation list is empty).
Byte
Page
0
0
64 (40h) 16
128 (80h) 32
192 (C0h) 48
End of memory
255 (FFh) 63
Hitag 1 Memory Map
Block
0
Serial number (Page 0)
Config’ bytes (Page 1)
Reserved Memory
4
User Data
8
User Data
12
User Data
15
Pages 16 to 63 are available for user data storage (192 bytes). It is advised not to use the
memory locations below page 16 because these are used for configuration and a different
mode of operation not supported on the standard Micro RWD. These are marked as reserved
by Philips Semiconductors.
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