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10
Wiegand Interface Unit Four State (WIU-4)
Installation Manual
J3: Door and REX switch connector
The 6-pin connector, J3, is the door and REX switch interface.
If the door or REX switch is set up as supervised (1K resistor in
series with switch between high and return pins, 1K in parallel
with switch), the WIU-4 treats both the door and REX switch as
supervised and reports four states: cut line, short circuit, closed
circuit, and open circuit.
Note:
To enable four-state supervision for the door and the REX, install a
jumper at position J4. Both points must be terminated with
resistors as shown in
If supervision is required for only one (the door or the REX), then
also insert a 1K resistor across J3, pins 3 and 4 or pins 5 and 6, as
applicable.
If the door or REX is not set as supervised, the adapter reports
two states: open when there is no connection between the high
and return pins, or closed when a short exists between high and
return pins.
Table 1.
J3 Door and REX switch connector
PIN
1
2
3
4
5
6
J4: Door and REX supervision connector
The 2-pin connector, J4, is the door and REX supervision
connector. By default, a jumper is installed on pins 1 and 2 to
enable 4-state supervision. Remove the jumper to disable 4-state
supervision and enable 2-state supervision.
Figure 4
Description
Power 12 VDC fused power, 250 mA maximum
Ground
Door (high) 5 VDC output
Door (return) 0-5 VDC input
REX (high) 5 VDC output
REX (return) 0-5 VDC input
on page 15.
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