Andreas Mattheiss <please.post@publicly.invalid> wrote: > Hi, > > ok, let's go all technical ;-) > > I wanted to play around a bit, building a reference clock from a cheap > DCF77 module (similar, but not identical to the infameous "Conrad > module"). It basically churns out 100/200ms pulses. I was planning on > using flavour 5 of the Type 8 module. I feed the signal from the module > into a level converter, based on the MAX232. This has been done many times > before, if I peruse success stories on the net. > > Alas, it won't work for me. I seem to get something out of pin 2 of my > plug; I can stick a LED in and get a long "on" signal with 100/200ms gaps > when connecting the LED one way, short 100/200ms bursts when swapping > anode and cathode. This I think is correct, since logic-0 is >+3V in > RS-232 and logic-1 is <-3V (the MAX232 already does inverting for me).
No, it is the wrong way around. Your signal should be < -3 most of the time, and pulse to > +3 during the 100/200ms pulses. _______________________________________________ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions
