The computer you use for home automation often will be sending commands to your X10 devices. But when you want to send a command yourself, to turn on a light or change a setting, for instance, you’ll need an X10 controller.
The most common way to send an X10 command is to use a minicontroller, which is a small box (shown in Figure 1-4) that plugs into a wall outlet and has an array of switches that send On
and Off
signals to X10 addresses.
It’s called a minicontroller because it has four buttons that, when combined with the selector switch at the bottom of the unit, can address only 8 units—half of the 16 possible units in a given house code. This is something to keep in mind when you’re selecting the module addresses you want to use; if you spread the addresses out too far, you’ll need two controllers to easily send them all commands. Or, buy a maxi-controller instead.