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From: TTman on 9 Mar 2010 14:16

"djordj" <grgmeda(a)gmail.com> wrote in message
news:4a0ea547-950d-4c57-8e6c-56bccfb9fcd6(a)b30g2000yqd.googlegroups.com...
> After looking at several application notes (by National, TI, B&B
> Electronic...) I can't understand if I can bias the two-wire bus
> without inserting a 120 ohm resistor between A and B cables.
> Reading B&B Electronics (http://www.dzjsw.com/shu/bz22.pdf) it seems
> to be possible (pages 18 and 19).
> Reading National (http://www.national.com/an/AN/AN-1057.pdf) not
> (pages 8 and 9).
>
> My design doesn't need terminators, as total cable length will be less
> than 4 meters, but I have to guarantee fail-safe conditions in bus
> idle state.
>
> Thanks
I think at 4M almost any configuration will work....I ran 100M + at 115K no
problem, but yes, if you need failsake use the pull up and down resistors.


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