Chris, I understand you had posted to the incorrect mailing list, but your question intrigued me. The first link in the question does not work, is that the correct link?
And for a UART, you definitely need level shifting (ie. like a MAX232, etc.) if connecting to +/-12v serial line, at the very least to avoid damaging the UART by overvoltage. In some cases, it is possible to do w/o the level shifting, due to the requirements in the RS-232 specs for the RX line of most UARTs, which are required to distinguish signals as low as +/-3v. Results are varied, as not every manu. follows the specs. verbatim. -Kyle Bassett On Feb 3, 2008 6:11 PM, Chris <[EMAIL PROTECTED]> wrote: > Hi, > > I tried this: http://owfs.sourceforge.net/WRT54G.html and it doesn't > work for me. > > It looks really weird how the author connected the DS2480B, which runs > at 5V directly to the UART, which provides only 3.3V. I think this would > need some level-shifting. > The datasheet also says the POL-Pin (Pin6) has to be tied to +5V if > directly connected to the UART. > > I made a small schematic with some resistors as level shifters: > http://img228.imageshack.us/img228/4611/ds2480bwrtmp0.png but I don't > think I like it. It's said that doing level shifting is very power hungry. > > Any better ideas? > > -Chris > > _______________________________________________ > OpenMoko community mailing list > community@lists.openmoko.org > http://lists.openmoko.org/mailman/listinfo/community >
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