Re: Question for Homevision users & 3 Phase

["David Buckley" <db@xxxxxxxxxxx>]

--- In ukha_d@xxxxxxx, "Dean Barrett" <dean@l...> wrote:
> Frank mentioned Homevision has a facility to link phases via
> software - does this only work for commands issue by Homevision
> or does it reissue any X10 commands on the cables to allow cross
> over between phases ?
>
> Stupid questions perhaps, but any help appreciated.

Not a stupid question at all.

I've not tried this, and I suspect that very few if anyone hereabouts
has tried it either.

So, based on what I know about how this stuff works, I'll take a best
guess.

The HV and similar boxes interface to mains with the TW523, and one of
the features of the TW523 is that it doesnt deliver raw X10 data to
the controller, it delivers a sanitised version.  Thus although a
TW523 can transmit and receive "simultaneously", the received
data
passed to the controller isnt sufficient in quantity to enable simple
electrical repeating using delays, software interpretation and
regeneration would be needed, and some stuff still couldn't work.
Thus I dont believe the HV will repeat incoming X10 commands.

I dont believe that a controller that uses a CM10/CM11 type interface
(with the RS232 interface) can ever do three phase.

Even with generated X10 commands, I suspect there may also be a gotcha
- HV and most other controllers are of US origin, the land of 60Hz, so
to work in the UK they have to do timing relative to 50Hz, so they
either need to be the right ROM "personality", or actually time
zero
crossings to determine the incoming mains frequency.

The X10 specs are fairly tight on how close the 120KHz burst shoule be
relative to zero crossings, less than few hundred microseconds adrift
IIRC.

You're in fairly deep territory here...