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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
>
>
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