Am Montag, 19. September 2011, 16:12:32 schrieb Jan Kandziora:
>
> You could easily build such a thing using an PIC or AVR µC. E.g. even the
> smaller AVRs have an internal UART for RS232. The I²C interface could be
> build up using bitbanging. The biggest problem of such a solution is
> speed, as RS232 is slow against I²C. For USB, the problem is programming
> the controller, as USB has a complicated protocol.
>
One addition to this. Enumerating the bus (and scanning for alarms) through
I²C puts a lot of load on the main CPU and is *slooooow*. If one builds up a
RS232<->I²C<->Onewire interface from a µC, it would help very much if these
operations are handled internally, like the DS2490 (DS9490) does.
Kind regards
Jan
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