[Elecraft] KPA 100 - KIO2 not working...

[Jack Brindle]

What version of K2 Control board do you have? It sounds like you have a
Rev A Control board, and you haven't done the modifications to connect  
the
serial port signals to the MCU. Make sure you have performed the steps  
on
pages 51-53 of the KPA100 (Revision A) manual which modify this board.

On Mar 9, 2004, at 6:13 AM, Rein Couperus wrote:

> The second problem is worse. I cannot get the KPIO2 working either way.
> On the TX side, Pin 5 of U4 (TXD) is +12.8 V instead of the -22  
> mentioned in
> the voltage table. I checked with an ohmmeter, and it looks like this  
> voltage
> must come out of U4. Is the voltage table wrong? Pin 12 of U4 is 0 V  
> instead
> of the +5 from the voltage table. Tracing the signal back to the  
> control
> board, pin 25 of U6 on the controlboard is 0 V as well, which shows the
> connection is o.k. I have switched PORT=ON and TEST does not move  
> anything.
> On the receive side the problem is different. I can follow the signal  
> from the
> RS232 port through to U6 on the control board (pin 26). But 'SW01;' is
> ignored by the MMU. The terminal is at 4800 8N2 (also tried 4800 8N1).
>
> Has this behaviour been seen before? The faq is rather short on this  
> subject,
> and the trouble shooting is limited to "check your terminal".
>

- Jack Brindle, WA4FIB
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