HomeVision Pro - X10 Interface
X10 is a control protocol which allows domestic electrical
wiring to carry control signals over the power line. This
Wikipedia article provides a good explanation of the history
and functionality of X10 control.
X10 is quite dated and whilst cheap, it does have some
limitations that are not present in later technologies:-
- Most devices only receive commands from the controller,
they do not report status
- The protocol is relatively slow
- The protocol is susceptible to electrical "noise"
- Commands can be "lost"
- Lamp modules do not work with fluorescent or low energy
So, why you would want to use it? - Because it is a low cost
and widely used system for controlling domestic appliances. At
some stage, I will upgrade my X10 modules to something more
modern, but for now, they work fine.
A TTL to X10 interface is required to connect the control
signals from the HomeVision Pro controller to the power line.
The generic device is an XM10 - the model I use is a Powerhouse
TW7223 (US Model TW523)