You live where?

X10 control commands are generally addressed to a specific module. Modules can have one of 256 addresses, which comprise two codes - a house code (A to P) and a unit code (one to 16). As the expected range of X10 signals is up to 200m on the mains wiring (though 80m is more commonly observed), closely adjacent buildings or apartments would likely see each other's signals, so control commands from one X10 installation could unintentionally alter the state of other installations nearby.

One of the tricks of X10 addressing is that multiple modules may use the same address and all will respond to the same command. In some cases this is necessary - for example, you may have four ceiling lights all on one physically switched circuit and want to keep controlling all four as one circuit.

Four LM15 plug-in bayonet switch modules, all set to the same address, would allow for this. Alternatively, you may wish to split that same four-light physical circuit into two two-light circuits. Without any wiring alterations, two LM15 modules set to the same address, and another two set to the same address as each other but different from the first pair, gives you control of what are now two logical circuits.

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