Follow-up to my previous message: Microchip application note AN555 shows another way of powering the PIC from the RS232 and full bidirectional communications over the serial bus. Another advantage is that the "low cost" solution (Fig.4) does deliver correct RS232 signal levels (AN519 only delivers +/-2.5V) from a single 5V supply to the PIC. http://www.microchip.com/download/appnote/devspec/16cxx/00555c.pdf
Uwe. PV> Does anyone have any experience in using an RS232 port to power a PV> periphereal device? The device includes a small PIC micro that will PV> need to send data back to the computer it's plugged into, so I need to PV> power the RS232 driver as well. PV> Any practical advice such as how much current and voltage I can rely on PV> will be appreciated. PV> Peter Vogel PV> ZapTV Pty Ltd PV> 30 Adeline St, Faulconbridge 2776 PV> Australia PV> Tel: 02 4751 8735 PV> Fax: 02 4751 2601 PV> email: [EMAIL PROTECTED] -- Author: Uwe Zimmermann INET: [EMAIL PROTECTED] Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB CHIPDIR-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
