Bx-24 reset when opening download port

Started by jacques_lebrun April 25, 2007
Is there a way to prevent the BX-24 from resetting when I open the
download port from the BasicX downloader?

I wrote a configuration program in VB6 and whenever I open the serial
port to the BX-24, it resets like if I resetted its power. I would
like to be able to open / close that port at will without resetting the
BX-24.

Thanks
> ... I wrote a configuration program in VB6 and whenever I open the
serial port to the BX-24, it resets...

It's been reported here a few times that Windows cycles DTR when it
opens a serial port. DTR becomes ATN on the BX-24; ATN capacitively
couples to /Reset.

You can prevent the reset by severing DTR/ATN. Common practice puts a
jumper in that line to permit reprogramming of the processor when you
need it; otherwise, DTR will have no effect with the jumper pulled.
Tom
That's it, I did not know Windows was cycling DTR on opening.

Thanks

--- In b..., "Tom Becker" wrote:
> > ... I wrote a configuration program in VB6 and whenever I open the
> serial port to the BX-24, it resets...
>
> It's been reported here a few times that Windows cycles DTR when it
> opens a serial port. DTR becomes ATN on the BX-24; ATN capacitively
> couples to /Reset.
>
> You can prevent the reset by severing DTR/ATN. Common practice puts a
> jumper in that line to permit reprogramming of the processor when you
> need it; otherwise, DTR will have no effect with the jumper pulled.
> Tom
>