Annex A. Wiegand Interface - Promag Mifare DESFire DF7 Series User Manual

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ANNEX A. Wiegand Interface

The Data 1 and Data 0 signals are held at a logic high level unit, the reader is ready to send a data stream.
The reader places data as asynchronous low-going pulses on the Data 1 or Data 0 lines to transmit the data
stream to Host. The Data 1 and Data 0 pulses will allowable pulse width times and pulse interval times for the
reader.
Data 1 Signal
Data 0 Signal
`
Pulse Times
Symbol
Tpw Pulse Width Time
Tpi Pulse Interval Time
Wiegand Packet (Without Reader ID)
Standard (Default)
Reverse (Option)
Connect the Wiegand wires, example as below: (The pull high resister must >= 10K Ohm)
Reader
Optional: External LED/Buzzer Control (Brown)
Tpw Tpi
Description
Parity(Even) (MSB)
Parity(Odd) (LSB)
7.5~24VDC
(Red)
Data 1 (White)
Data 0 (Green)
(Black)
GND
Tpw Tpi
Typical Time
100us +/- 3%
1.9ms +/- 3%
Data Bits
Data Bits
HOST/Terminal
5VDC
10K 10K
ohm ohm
GND
40
DF7XX
REV.E
(LSB) Parity(Odd)
(MSB) Parity(Even)
Pull high resistor
>=10K Ohm