ib technology

14

Micro RWD H2 Protocol

The MicroRWD H2 Reader mode a complete read / write and tag acceptance solution for

Hitag 2 RFID transponders (in Password mode).

Write Tag

Command to write 4 bytes of data to HT2 32 bit page. If the write was unsuccessful (invalid

tag or out of field) then Status flags in acknowledge byte indicate error.

B7

B0

Command:

0 1 0 1 0 1 1 1

(ASCII “W”, 0x57)

Argument1:

x x x x x N N N

(N = HT2 page address 0-7)

Argument2:

D D D D D D D D

(D = msb data to write to HT2)

Argument3:

D D D D D D D D

Argument4:

D D D D D D D D

Argument5:

D D D D D D D D

(D = lsb data to write to HT2)

Acknowledge:

1 1 F F F F F X

(F = Status flags)

Note that PASSWORD exchange occurs for WRITE command.

If no tag present then acknowledge / status byte reply is 0xC0

If tag present but RWD PASSWORD check fails then acknowledge byte reply is 0xC0.

If tag present but TAG PASSWORD check fails then acknowledge byte reply is 0xC4.

If tag present and both PASSWORDS match then acknowledge reply is 0xD6.

Read Tag

Command to read 4 bytes of data from HT2 32 bit page. If the read was successful, indicated

by acknowledge status flags then four bytes of tag data follow.

B7

B0

Command:

0 1 0 1 0 0 1 0

(ASCII “R”, 0x52)

Argument1:

x x x x x N N N

(N = HT2 page address 0-7)

Acknowledge:

1 1 F F F F F X

(F = Status flags)

Data only follows if read was successful

Reply1:

D D D D D D D D

(D = msb data to write to HT2)

Reply2:

D D D D D D D D

Reply3:

D D D D D D D D

Reply4:

D D D D D D D D

(D = lsb data to write to HT2)

Note that PASSWORD exchange occurs for READ command.

If no tag present then acknowledge / status byte reply is 0xC0

If tag present but RWD PASSWORD check fails then acknowledge byte reply is 0xC0.

If tag present but TAG PASSWORD check fails then acknowledge byte reply is 0xC4.

If tag present and both PASSWORDS match then acknowledge reply is 0xD6 followed by 4-

bytes of data.