ib technology
Data Sheet
H1W200102.pdf
10 Pages
Last Revised 30/01/02
Micro RWD H1 “Wiegand” Output Version
This version of the Micro RWD product behaves in the same manner as the standard Micro
RWD Hitag 1 reader with the additional feature of having variable length “Wiegand” data
outputs. Also, the OP2 and OP3 outputs are now active high and idle in a low state. The
solution only needs a 600-700µΗ antenna coil connected and 5v DC supply to be a fully
featured read/write solution. The Wiegand DATA high and DATA low signals form the
common protocol that has been a standard for many years on door entry and access control
readers. The usual TTL serial interface is also supported along with the simple commands to
read and write tag data and programme the RWD’s internal parameters.
The diagram below shows the pinout configuration for the Hybrid chip version; two pins are
used to output the DATA high and DATA low signals according to the “Wiegand" protocol.
The Micro RWD “Wiegand” version can replace existing door entry systems with a fully
compatible contactless smart card solution.
Micro RWD Hybrid chip connections
+5v
Red LED
1
24
CTS
TTL
Tx
Rx
Micro
RWD
SW overri
de
470R
Green LED
RS232 I/F
LOAD
+5v DC supply
Wiegand DATA HIGH
Wiegand DATA LOW
25ma (O/P) drives
0v GND
700
µH
Antenna
(34 SWG wire
)
22R
12
Screen
(if applicable)
13
0v GND
The Micro RWD "Wiegand" version 1.20 supports 4 to 34 bit output protocols (2 to 32 bits
of data). The particular data length required is programmed into the RWD internal EEPROM
byte 1 (second location). The value loaded is rounded down to an even number and a zero
parameter effectively turns the Wiegand output OFF. Values less than 4 are treated as zero
and values greater than 34 are set to the maximum value of 34.
The RWD operates by using the 32 bit (4 byte) unique serial number from Page 0 of the Hitag
1 transponder memory to create the required DATA high, DATA low Wiegand outputs.
The 4 to 34 bit variable Wiegand output (2 to 32 bits data field) is taken as the first N bits
(most significant bit first) of the serial number.
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