> I have speadsheeted the options, feel free to post corrections or
additions:
>
>                                 RS-485  RS-485  RS-485  CAN
CAN             I2C
>                                 75176           SN65LBC184      MAX485
MCP2510 18F448  P82B96
>
> ~ max length ft
>     @ ~500bts/hz                4000            4000            4000
2000            2000            1000
> ~ max nodes                     64[?]           128             128
100             100             1028
> chip count                      2               2               2
3               2               2
> noise immunity          high            high            high
high            high            low
> transient suppression   low             high            high
high            high            low
> anti collision          no              no              no
yes             yes             yes
> disabled node dropout   no              no              no
yes             yes             no
> parts readily available yes             yes             yes
yes             no              yes
> cost USD (quant 25)     5.86            7.08            7.21
9.09            7.45            7.34
> Notes                           16F877  16F877  16F877  16F877  82C250  w/
active
>
82C250                  pull up

For I2C, I think you meant 1024, rather than 1028.  I2C also has bus
arbitration (is that what you mean by anticollision?).  You can check the
spec. sheet from Philips, or someone else on the list can give you more
information.

[snip]

> I don't see any advantage of I2C over CAN w/18F448.

Couldn't tell you.  I just thought you should know that there was the
option.

[snip]

--Brendan

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