Re: Combining X10 powerline interfaces

["K. C. Li" <li@xxxxxxx>]

On Sat, 29 Jun 2002, Kevin Hawkins wrote:

>     Anyone think this is a worthwhile project and
how many local interfaces
> would you think makes sense ?

It would be a challenging project to design and implement. The X-10
two-way powerline interface is an elementary device that has little or
no
intelligence built in. The sending device connected to the TW523/XM10U
needs to tell it exactly at what point in the mains sinewave to send
the
120KHz signal in milliseconds and the duration. Likewise, the receiving
signal from the TW523/XM10U is raw TTL signal that follows the waveform
of
the receiving X-10 signal. There is also the regular 50Hz (100Hz in
effect) zero-crossing pulses available.

The proposed device would have to emulate and provide the raw TTL
signals
to interface with all the attached equipment that are designed to work
with TW523/XM10U in real-time and simultaneously. Presumably, the
proposed
device would also have to resolve collision problems between connected
equipment.

Regards,

Kwong Li
li@xxxxxxx
Laser Business Systems Ltd.
http://www.laser.com



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