Right, the TS-7xxx boards have a lot of power, but you need a programmable node on the network to process data and possibly store history, and also communicate values back to a server on a wired network. But, the cost of hanging IO is going to get a lot cheaper if we can make this work. Chips are $20 or cheaper (with on- board IO), and then you add some signal conditioning, and we are not talking very much. Also no wiring.
The problem is, I think we are a ways off to having interoperable networks and everything working correctly out of the box. Don.
On 10/31/06, Pat Farrell
<> wrote:
Don W. Carr wrote:
> For me, the value in zigbee/802.15.4 is that it does the encryption,
> routing, etc. For me, a bare radio would be a lot of extra work.
All of the ZigBee chip radios that I've looked at have the encryption
AES-128 built in, and it is good. But the standard key management is not
good. Maybe they will fix it in ZigBee 1.3
> Correct me if I am wrong, but it seems that the Maxstream product has
> a radio, serial interface, various on-board I/O, and the zigbee part
> baked in, all in about 1x1 inch part.
As is the Ember 260. Quad 48, under an inch on the side.
> Thus, you could use the Maxtream product to
> export the analog values and discrete values from the TS-7400.
However, with a TS-7xxx, you could use the SPI on any of the ZigBee
products to handle the IO, and the TS-7xxx has far more CPU power than
is needed.
--
Pat Farrell
http://www.pfarrell.com/
-- Dr. Don W. Carr J. G. Montenegro 2258 Guadalajara, Mexico +52-333-630-0704 +52-333-836-4500 ext 2930
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