Hi, I'm an elevator technician. The attached oscilloscope display picture is from a digital elevator hall arrival lantern data signal. We have been having problems with “ghost signals” causing intermittent hall arrival lanterns to illuminate randomly when the elevator is not actually due to arrive at the floor.
The tech support of the hall arrival board manufacturer (CE Electronics) is blaming the elevator controller manufacturer (MCE), and the tech support of the elevator controller blames the hall arrival board manufacturer.
The boards are powered by a ground referenced...
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