SP Controls SmartPanel - Manual (Page 37)

SmartPanel Configuration and Installation Guide Page 33
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These and similar cases should be avoided, since they undermine user trust in the Panel and
installation as a whole.
Note: Some projectors use the same command for on and off. If you are using one of these
projectors, the Configuration Utility forces you to select a feedback mechanism by
disabling the None option. The side effects of getting out of sync with these projectors
would be disastrous from a control point of view; the projector and Panel could remain
indefinitely out of sync.