RWD_QT Datasheet, PDF (14/19 Pages) rfsolutions.ltd – The MicroRWD “QT” (Quad-Tag) version is a complete 125kHz reader solution for Hitag 1,

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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.
Command:
Argument1:
Argument2:
Argument3:
Argument4:
Argument5:
B7
B0
01010111
x x x x xNNN
DDDDDDDD
DDDDDDDD
DDDDDDDD
DDDDDDDD
Acknowledge: 1 1 F F F F F X
(ASCII “W”, 0x57)
(N = HT2 page address 0-7)
(D = msb data to write to HT2)
(D = lsb data to write to HT2)
(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.
Command:
Argument1:
B7
B0
01010010
x x x x xN NN
Acknowledge: 1 1 F F F F F X
(ASCII “R”, 0x52)
(N = HT2 page address 0-7)
(F = Status flags)
Data only follows if read was successful
Reply1:
DDDDDDDD
Reply2:
DDDDDDDD
Reply3:
DDDDDDDD
Reply4:
DDDDDDDD
(D = msb data to write to HT2)
(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.
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