Indicator Diagnostic Button
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Purpose
The MPrT button (Meldeprüftaste or indicator check button) is a DUS501 diagnostic tool. With it, the dispatcher can verify that the panel lights are working correctly.
Operation
The button has three states:
- normal
- all OFF
- all ON
Cycling through these states is accomplished by pressing MPrT together with the station button. Each time MPrT + station button are pressed, the diagnostic status changes. You will need to do this combination three times to return the panel to the normal state.