Wiegand Interface Unit Four State (WIU-4)
Installation Manual
18
Indicators
The WIU-4 has four green LEDs that operate as indicated in the
following table.
Table 6. Green LED indicator status
LED Operation
D1 DI Monitor LED
ON = door switch is reporting that the door is closed.
OFF = door switch is reporting the door is open.
The LED works the same regardless of whether the
switch is supervised or not.
D2 F/2F Data LED
Pulses ON for a short time, approximately every 3
seconds, indicating that the WIU-4 is sending “I’m
alive” messages on the F/2F data output. It also
pulses ON once for every badge read and once for a
DI status change.
D3 Door DO LED
ON = Door DO output from the micro is active.
D20 Power LED
ON = board has 12 VDC power connected.
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