Could you give me a more detailed explanation of what ""Use On instead of brighten 100%". does.
The X10 protocol includes (among other signals) On, Off, Brighten, and Dim. An X10 dimmer module can be in the states Off, On, or Dimmed (to some brightness level).
X-10's older lamp modules and dimmer switches do not respond to an On signal when they are in a Dimmed state, even if fully dimmed to darkness (but not actually Off). To drive the module to full brightness it has to be sent a Brighten signal. So for simplicity AHP originally used only the Brighten 100% signal to turn on lamp modules and dimmers, which would work regardless of whether the module was Off or Dimmed. The check box to use On instead of Brighten 100% for macros was added in one of the early AHP upgrades, but I can't remember the rationale for it at the time. It was never applied to simple timers, which continue to use the Brighten 100%.
Now step ahead a couple of years. The obsolescence of some electrical components forced a hardware redesign of many X-10 modules, and X-10 decided to add additional (and very nice) new features to the firmware while they were at it. Unfortunately there is a flaw in the redesign for the WS467 Wall Switch which makes it incompatible with the original module - it can't be turned On from the Off state by a Dim or Brighten signal. It remains to be seen whether X-10 will fix the WS467 flaw, revert to the original firmware functionality, modify AHP to cope, or do nothing. (Interestingly, the redesigned LM465 Lamp Module includes the new features but without the above flaw.)
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