To diagnose the cassette on the AC41 you will need a multimeter and wires.

Due to the cassette inputs being small, to obtain valid readings you will need to insert a wire into the cassette so the multimeter can make proper contact to ensure an accurate measurement. When inserting the wire give the wire a small tug to ensure that the wire is properly connected to the cassette.

Diagnosing the RS-485 power / Verkada Reader

Double-check on the left side of the AC41 that either 12 or 24 volts are selected depending on your lock.

Insert a wire into the + and - terminals and switch the multimeter to DC. To do that, turn the knob on the multimeter to the symbol below.

Using your multimeter, touch the red probe to the positive wire (+) and the black probe to the negative wire (-). The output for a working cassette should be 12 volts.

Repeat these steps to test the power output for the Wiegand reader.

Testing NO Power Output

Connect the black wire to the COM port on the cassette. Next, connect the red wire to the NC port. The output of the NC should be what you set on the left-hand side of the AC41, in this case, 24 volts.

Testing NC Power Output

Connect the black wire to the COM port of the cassette. Next plugin the red wire to NO on the cassette. Go to the top of the AC41 where the door button is and push said button until the LED is under the door you are testing (In this case door number 4). Press the Emulate lock and the output power should be what is set on the left-hand side of the AC41 (In this case 24 volts).

Testing DPI

To test the DPI, connect the red wire to the uppermost DPI input of the cassette and the black wire to the lowest input of the DPI. Then using the multimeter probes, touch the red probe to the red wire and the black probe to the black wire. The output of the cassette should be around 5 volts.

Testing REX

To test the REX, connect the red wire to the uppermost REX input of the cassette and the black wire to the lowest input of the REX. Then using the multimeter probes, touch the red probe to the red wire and the black probe to the black wire. The output of the cassette should be around 5 volts.

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