RE: Re: Your Opinions please

["Dave McLaughlin" <dave@xxxxxxx>]

Hi Mark,

Excuse me for being a bit cynical, but 160 bytes just to switch on a light
is a bit heavy going. Having not really looked at xAP in too much detail,
mainly because I am working on my own CAN bus based system, I find it hard
to believe it takes so many bytes. With my protocol I use a single 29 bit
identifier for the sender, receiver and ID with 2 bytes in the message to
indicate what to do with the output. Same for the reply.

My main reason for asking is how you accommodate such a large telegram with
small microcontrollers? Some of the devices I use only have 2K bytes of
programme space. Maybe Ian Bird could enlighten me to how he has been
getting on with this?

Maybe I should look at it again and see if I can come up with a xAP to CAN
bus gateway as this would allow me to use some of the excellent hardware
you
guys have been building/creating. In fact I tried to find the xAP website
on
sourceforge just now but it was not there... Has this been moved elsewhere?

Regards
Dave...
-----Original Message-----
From: mark_harrison_uk2 [mailto:mph@xxxxxxx]
Sent: 01 September 2003 21:49
To: ukha_d@xxxxxxx
Subject: [ukha_d] Re: Your Opinions please


Just done a few calculations after your comments about xAP being too
heavy.

A xAP message in the X-10 xAP schema to turn on a light is typically
about 160 bytes, which is to say 1280 bits.
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