Re: Technical problem (OT)

You're assuming that the grounds are actually connected together and at the 
same potential; without studying it in detail I suspect they're inverting 
the signal. Everything is relative...

Also keep in mind that RS-232 signals are +/- 12V (e.g. pin 3 is normally 
at -12V which will light the LED quite nicely)

m
----- Original Message ----- 
From: "Scott" <rylos@charter.net>
To: <cbm-hackers@musoftware.de>
Sent: Friday, September 24, 2010 5:57 PM
Subject: RE: Technical problem (OT)


> Well, the LED can't work. I was thinking that the pin may be miss-labeled
> but no... Pin 5 is signal Ground.
>
> http://www.diyha.co.uk/electronics/comm1.html
>
> Even if the shield had power isn't the polarity wrong?
>
> http://www.diyha.co.uk/electronics/comm1.html
>
> -----Original Message-----
> From: owner-cbm-hackers@musoftware.de
> [mailto:owner-cbm-hackers@musoftware.de] On Behalf Of Ruud@Baltissen.org
> Sent: Friday, September 24, 2010 4:46 PM
> To: cbm-hackers@musoftware.de
> Subject: Technical problem (OT)
>
> Hallo allemaal,
>
>
> I think I found the reason for my email problems. A bit further you
> see "bit......" and that was "bit baCC ngBB MMed". I think there is
> a porno filter active :)
>
>
> I had to buy a TI-84 for my son for school. Quite interesting, it
> has a Z80 on board. It has a bit...... USB interface and another
> bit....... 2-line interface. This particular interface can be
> connected to the RS-232, please se:
> http://www.ticalc.org/hardware/cables/serial.html
> http://www.linkkabel.nl/tutorials/linkkabelmaken/schema.htm
> The second site is Dutch but the schematic is more clear IMHO.
>
> Why this email? I'm puzzled, I have no idea how this can work well
> with the LED between the two Grounds.
>
> If anybody can explain this, please! Thank you!
>
>
> --
>    ___
>   / __|__
>  / /  |_/     Groetjes, Ruud Baltissen
>  \ \__|_\
>   \___|       http://Ruud.C64.org
>
>
>
>
>
>
>
>       Message was sent through the cbm-hackers mailing list
>
>
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