RE: [ha] OK. OK. So a lot of people like CAN

John Mullan (
Thu, 26 Aug 1999 14:57:40 -0400

The "original model" I refered to should be "original concept" in that a
complete HA system should work over a variety of media, not just twisted

I envision I.R. / R.F. / UTP / Powerline. While the protocol would
probably involve some custom type packets over CAN or something else.
Bridges would need to be designed to manage the changes in media.

I also envision a custom protocol that would make allowances for X10. How
that can be managed over powerline is something I haven't figured out.
Perhaps some smarts on the CAN end to detect X10 and transmit it if
necessary. I think X10 modules would be good for dedicated areas that
don't require two-way communication (even though that would probably be the
rare case). I just don't want to trash the pieces I have.

John Mullan

-----Original Message-----
From: Steve Letkeman []
Sent: Wednesday, August 25, 1999 11:46 PM
Subject: Re: [ha] OK. OK. So a lot of people like CAN

Sorry, what was the original model?


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Controller Area Network boards for HC11, ISA/PC104 and Parallel
I/O boards for ISA and Parallel, Win95/98 and NT drivers included

-----Original Message-----
From: John Mullan <>
To: '' <>
Date: Wednesday, August 25, 1999 7:10 PM
Subject: [ha] OK. OK. So a lot of people like CAN

>You've convinced me that CAN can be good. And likely it can do the job of
>There has been a lot of mention about using it with hard-wired
>installations. That's all well and good but to fit our original model, we
>can't rely strickly on hard-wiring. Some of it has to be IR, some has to
>be RF and some has to be power-line carrier.
>I'm going to look into using CAN via a PIC micro and their CAN interface
>chip. Surely we can add IR/RF/PL to the other side of the chip, not just
>This will be a good step in the hardware direction. Since I work my job
>quite a bit, it could take a couple of weeks for me to get one of those
>chips and play around a bit. If anybody else has some hardware/software
>stuff in this line please direct it my way so I can have a peek at it.
>John Mullan