What sort of X10 receivers exist?
The simplest X10 receiver is a small module with an electrical plug (to connect to a standard wall outlet), an electrical outlet (to provide controlled power to the device it’s controlling) and two dials (to set the unit ID code) on it. An appliance module has relay inside which switches power to its outlet on or off in response to X10 commands directed to it. A lamp module is similar, but has a triac instead of a relay and will respond to dimming commands as well as on or off commands. Other receivers can be wired into wall outlets or into lamp fixtures. Note that the standard wall switch (X10:WS467) is a receiver, not a transmitter; it does not transmit X10 commands, and only takes action when it receives the appropriate X10 command or local button-push.
