Omega Vehicle Security OMP-MODL manual 11-22

11... APPENDIX A: MASTER ICON FILE REFERENCE

Debounce: Enables a hardware filter circuit that prevents short duration transitions from passing into the icon. Debounce can be used to filter out contact bounce from mechanical switches. The GPDI Debounce has a time constant of approximately 50mS. Debounce should not be used when counting signals of frequency higher than 10Hz or signals with On or Off durations shorter than approximately 100mS.

FYI: Contact bounce is a phenomenon that occurs when a mechanical switch opens or closes. During switching, the physical electrical contacts inside the switch bounce against each other a number of times before they settle to their final state.

Depending on the duty cycle of the contact bounce, the OMP-MODL may count these bounces as events or transitions (count mode) resulting in technically accurate but undesired data. By enabling the debounce function, typical short duration contact bounce will be filtered out.

Count Rising / Falling Edges: The GPDI increments its accumulated count when its input changes state from hi to lo or lo to hi. The User can specify which transition (edge) is to be counted Rising (lo to hi) or Falling (hi to lo). For example if a switch is connected to the input, the User can specify that the count increment when the switch closes (Falling Edge) or when it opens (Rising Edge).

11-22 USING THE OMP-MODL