Hi, Richard,

That's what I was looking for! Schematic No.4 is exactly what I meant.

Thnaks everybody for your quick and good help!

Best regards

Peter

-----Urspr=FCngliche Nachricht-----
Von: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] Im Auftrag von
Richard Seriani, Sr.
Gesendet: Freitag, 16. November 2007 15:21
An: Microcontroller discussion list - Public.
Betreff: Re: [PIC]: RS232 to 5V interface without supply voltage


----- Original Message -----
From: "Peter Feucht" <p.feucht@palmed-medizintechnik.de>
To: "'Microcontroller discussion list - Public.'" <piclist@mit.edu>
Sent: Friday, November 16, 2007 7:38 AM
Subject: [PIC]: RS232 to 5V interface without supply voltage


> Dear Piccers,
>
> I remember, that a long time ago I saw an application note for a
> RS232-to-PIC(5V) interface which worked without any external power supply,
> but it took the needed voltages from some pins of the serial port. It had
> just a RS232 9 pole Dsub and 3 Pins (Rx,Tx,GND) on the PIC side.
>
> I just googled but wasn't successful.
>
> Does anybody remember such an application?
>
> Thanks for any help and best regards
>
> Peter
>

Could one of these help?
http://surducan.netfirms.com/RS232.html

Richard


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