Intermittant boot problem

Archiver

I have built a series of boxes, and they work well, with a BS2.

However, sometimes I like to plug the rs-232 back into the connector to see
what is going on. Intermitantly, when I do this, the BS2 reboots. I know
this because of what it says, and I hear the relays (which are driven by the
BS2) clicking exactly like they do when I reprogram the BS2.

Any clues? I'm worried that there is a Voltage difference between the lines
of the BS2 in the box, and the computer lines; as I plug them in, which
causes this. But haven't tested that theory yet.

Archiver

The DTR signal, when active, resets the
BS2. If you havn't done anything special to
the DTR line (ie the default is Active) then
it will reset the stamp when you plug it in.

Solutions: Disconnect DB-9 Pin 4.
Even having a capacitor in series won't
prevent a reset on initial plug-in.

--- In basicstamps@yahoogroups.com, "Grover Richardson"
<grover.richardson@g...> wrote:
>
> I have built a series of boxes, and they work well, with a BS2.
>
> However, sometimes I like to plug the rs-232 back into the
connector to see
> what is going on. Intermitantly, when I do this, the BS2 reboots.
I know
> this because of what it says, and I hear the relays (which are
driven by the
> BS2) clicking exactly like they do when I reprogram the BS2.
>
> Any clues? I'm worried that there is a Voltage difference between
the lines
> of the BS2 in the box, and the computer lines; as I plug them in,
which
> causes this. But haven't tested that theory yet.