If you own an oscilloscope, then look for the signals on the D0, D1 lines.
And check the voltages, there could be 5V on these lines.
No oscilloscope, then
- look for a nearby hackspace, there could be some equipment
- schools, universities have equipment
- use a raspberry pico to trace the signals. Record the transitions and print results to USB serial
- if you have a RPi(1,2,3,4), then use pigpio to trace signals. Record the transitions and print results to a terminal or store to file.
- use an arduino board to trace signals.
For the last options, be sure the voltage is 3.3V only!
When you have traces, then check if these are 'wiegand' physical layer. Pulswidth of 20 µs to 100 µs in intervals of 200 µs to 20 ms
The 'Clock' could be a typo on the sheet you posted. Which device are you using? Did you contact the vendor, producer?
And check the voltages, there could be 5V on these lines.
No oscilloscope, then
- look for a nearby hackspace, there could be some equipment
- schools, universities have equipment
- use a raspberry pico to trace the signals. Record the transitions and print results to USB serial
- if you have a RPi(1,2,3,4), then use pigpio to trace signals. Record the transitions and print results to a terminal or store to file.
- use an arduino board to trace signals.
For the last options, be sure the voltage is 3.3V only!
When you have traces, then check if these are 'wiegand' physical layer. Pulswidth of 20 µs to 100 µs in intervals of 200 µs to 20 ms
The 'Clock' could be a typo on the sheet you posted. Which device are you using? Did you contact the vendor, producer?
Statistics: Posted by ghp — Sat Feb 07, 2026 8:58 am