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Control Channel Locations
Why Do X-10 Devices Turn Off Then On?
A limitation of X-10 is devices can not be "polled" to determine their current state. Almost all X-10 wall switches
are only receivers, therefore, if a user manually dims or turns a light off, the controller has no manner to determine
if the light is on or off. A second limitation of the X-10 protocol is that a dimmed light will not respond to a unit
"on" command by going to full on. Therefore, until units begin to respond to the "preset dimming" section of the X-
10 specification, a user can not dim a light from the phone or keypad to a specific dim level unless an off
command precedes a unit "on" command. This ensures any of the following dim commands will match the level
spoken by the system. This same issue affects the implementation of the preset dim command. This feature sends
an off command followed by the appropriate dim command to arrive at the programmed dim level.
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