'''[wiki:GraspSwDemoScripts pon (Power ON detector voltages)]'''

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When spelled as one word with three letters, '''pon''' and '''pof''' specifically refer to applying "high" (potentially damaging, if wrong) voltages to a detector.  The '''pon''' command may or may not be configured to use the '''PONFITS''' setting in '''[wiki:GraspSwDemoConfig config]''' for reference voltages and clocking patterns from a previously saved exposure.  Before issuing '''pon''' the controller must have '''[wiki:GraspSwDemoStage2 stage2]''' embedded code loaded.  It is only necessary to issue this command once.

Before removing main power from the system, issuing a '''reset''' or '''[wiki:GraspSwDemoStage2 stage2]''' detector voltages should be off first by using the '''pof command.'''  If this is not done, the controllers DACs will continue to supply power to the detector, and turning off main power may not result in the cleanest power-off system to ensure maximum safety for the detector.

=== pon fake ===

Some devices take a long time to settle after having voltages removed and re-applied.  It is possible to boot into a different (e.g., for development/testing) stage2 and keep voltages applied to the detector by ignoring the advice above and simply issuing '''[wiki:GraspSwDemoStage2 stage2]''' without powering off the detector first.  After the controller reboots, do not issue '''pon''' because most implementation of '''pon''' first remove voltages before re-applying.  The special syntax:

{{{
pon fake
}}}

will restore clocking patterns without disturbing detector voltages (if supported on the system.)