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The ActiveHome Interface connects to your computer's serial port and then plugs
into a wall outlet. The ActiveHome software tells the Interface what to do. The
Interface then sends digital signals over your existing house wiring to a Module
which receives the signals and executes the command sent by the Controller, in this
case your PC.
Each Module has a specific address made up of a Housecode (red dial on the face
of the Module) and a Unit Code (black dial on the face of the Module). The
Controller first sends an address and then a command on the AC power lines. Only
the Module with a matching address will execute the command. If more than one
Module has the same address, both Modules will execute the command. Addresses
are set on the Module by turning the two dials on the front of the Module to the
desired letter and number (using a small screwdriver or a coin). The Housecode is
selected from the letters A through P, and the Unit Code is selected from the
numbers 1 through 16.