--Message-Boundary-19729 Content-type: text/plain; charset=US-ASCII Content-transfer-encoding: 7BIT Content-description: Mail message body See the attached circuit. It uses TXD for -V. RTS or DTR could be used instead. Mark Jordan On 17 Nov 2007 at 16:31, Funny NYPD wrote: > I remember the old mouse use a 555 to convert negative voltage to a positive voltage power supply, this maybe what you are looking for. NS may still have the application sheet available online. > > Funny N. > New Bedford, MA > http://www.AuElectronics.selfip.com > > > > ----- Original Message ---- > From: Peter Feucht > To: Microcontroller discussion list - Public. > Sent: Friday, November 16, 2007 7:38:41 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 > > > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > > > ____________________________________________________________________________________ > Get easy, one-click access to your favorites. > Make Yahoo! your homepage. > http://www.yahoo.com/r/hs > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist --Message-Boundary-19729 Content-type: text/plain; charset=US-ASCII Content-disposition: inline Content-description: Attachment information. The following section of this message contains a file attachment prepared for transmission using the Internet MIME message format. If you are using Pegasus Mail, or any other MIME-compliant system, you should be able to save it or view it from within your mailer. If you cannot, please ask your system administrator for assistance. ---- File information ----------- File: RS232-TTL.gif Date: 10 Aug 2004, 13:41 Size: 6129 bytes. 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