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I'm installing a connector on a project so I don't have to keep
removing the BX-24 all the time. I'm double-checking the connections
on my BOE, and there appear to be 2 capacitors on the ATN connection.
These are not shown on the website's picture of the connections. Are
these necessary, or just to try to filter out noise?



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> ... two capacitors on the [BOE] ATN connection...

An AC-coupled voltage divider, I think, for 12v RS232 levels.

BS2 module ATN (pin 3) is DC-coupled and inverted to /Reset.
BX-24 module ATN is DC-coupled but not inverted and not to /Reset.
BX-24p module ATN is AC-coupled and inverted to /Reset.
Tom



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Well, I've got another project with a BS2 in it, without the
capacitors. Aren't the BS2 & BX24 compatible? If I use the project
I've got now with my BX-24, or build my new one without the caps, will
I have any problems? I don't want to blow a $45 chip...

I believe I have the BX24p...
--- In b...@yahoogroups.com, "Tom Becker" wrote:
>
> > ... two capacitors on the [BOE] ATN connection...
>
> An AC-coupled voltage divider, I think, for 12v RS232 levels.
>
> BS2 module ATN (pin 3) is DC-coupled and inverted to /Reset.
> BX-24 module ATN is DC-coupled but not inverted and not to /Reset.
> BX-24p module ATN is AC-coupled and inverted to /Reset.
> Tom
>



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> ... Aren't the BS2 & BX24 compatible?

They are pin-compatible, yes. They differ in how they use ATN
signaling, but that boils down to respectively similar functions, to
control the module by the IDE.

FWIW, I have a Basic Stamp Super Carrier that's seven years old now, I
guess, an apparent similar predecessor to the BOE. Frankly, I have
never paid any attention to that capacitive ATN divider until now; I've
used the board for many short experiments with many BX-24s and ZX-24s
with no harm - or unexpected behavior.

I expect you'll be fine with it.
Tom



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> ... BOE...

BOE is a Parallax product, isn't it?
Tom



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