Paul,

On Sun, 5 Nov 2006 03:31:21 -0500, Paul Anderson wrote:

> Hope I have this categorized right:)  If not, do let me know.  I have
> the Olimex PG4 board, with a PIC16F84A.  I'm aware that the olimex
> board uses the serial port for power, and it will not work with a USB
> to serial adapter.  Unfortunately, I don't have a serial port on this
> computer.  Is it possible to power the olimex board off of a 9v
> adapter while programming?  Or can that only be used while the chip is
> running?

Looking at the circuit diagram:  http://www.olimex.com/dev/images/pic-pg4d-sch.gif  it seems to be using pin 3 of the "PGM" socket to supply the 13V programming voltage, so as far as I can see you'll need to supply this yourself.  There is no way it can generate the programming voltage on the board - there's just no circuitry to do so, unless I've missed something!  :-)

Now unless I've forgotten all I know about RS232 on a DB9 connector, pin 3 is RXD (receive data), and the actual programming is using control signals for the data and clock.  No wonder it won't work with a USB converter!  I think you'll be very lucky to get it to work even if you do supply the programming voltage, unless anyone knows different?

Cheers,


Howard Winter
St.Albans, England


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