On Oct 28 2010, Charles Manning wrote:

>Hello Ballooners
>
> I am wanting to look up via RS232 to an external micro and still want to 
> retain the main console serial console use.
>
> From what I have read there should be 2 serial connections @ 3V3 lurking 
> somewhere in a Ballon3/CUED box. I searched but did not find any 
> schematics etc.

At CUED we've only ever used an extra extra comm port once, and that
required using a soldering iron.

http://balloonboard.org/hardware/300/balloon3_connector_pinouts_P1_P2.pdf
gives the pin outs of J11 (Comms port) which goes to the CUED board.
The other two serial ports are on this, but to use them from the CUED
board then requires mod wire to pins 2,3 (or 4,5) of the FFC connector.

Best wishes,

  Paul.


Paul Fidler
-- 
Cambridge University Engineering Department | Tel: +44 1223 332816
Trumpington Street, Cambridge, CB2 1PZ, UK  | Fax: +44 1223 332662