ib technology

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Data Sheet

H2PROT.PDF

9 Pages

Last Revised 04/11/09

Micro RWD H2 Protocol

The MicroRWD H2 version is a complete reader and tag acceptance solution for Hitag 2

RF transponders. The solution only needs a 700uH antenna coil connected and 5v DC

supply to be a fully featured read/write system. The module provides internal EEPROM

memory for holding lists of authorised identity codes, a manual override switch facility

and has LED drives to give visual indication of acceptance.

The RWD also has a TTL level RS232 interface that allows a host system to

communicate with the RWD if necessary, so that system features can be customised,

configurations changed and tag read/write data handled by the host system.

The Hitag 2 transponders provide 256 bits (32 bytes) of read/write EEPROM memory

arranged as 8 partitioned 32 bit pages. An area of 128 bits (16 bytes) is open for general

user data. The Hitag 2 transponders are configurable for different modes of operation

and the MircoRWD H2 version supports the high security PASSWORD mode only.

This feature uses two password codes stored both in the H2 transponder and the RWD

that are mutually exchanged when a tag is brought into the RF field; the tag is only

unlocked for read/write operations if these codes exactly agree.

The use of this Mutual Authentication process, encrypted communications and a pulsed

RF field ensures that the MicroRWD H2 reader system is very secure.

TTL

RS232 I/F

Tx

Rx

CTS

LOAD

Screen

(if applicable)

700 uH Antenna

25ma (sink) O/P drives

Micro

RWD

HT

Green LED

Red LED

1k

SW overri

de

+5v

0v GND

+5v DC supply

25ma (sink) (O/P) drives

+5v

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

0v GND

22R nom

Typical application configuration for Micro RWD module