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

Tue Mar 9 13:41:04 2004

Tnx Jack,

Of course I first did the mods on the control board... and I have checked that 
the signals come through from the MCU to U4 on the KPA100. Only they are 
wrong!!. I have an RS232 tester, and I can see signals going from the 
terminal to the rig, and I can see the voltage swinging a bit on the input 
(MMU), but no reaction... as if the MCU is deaf. I have done everything the 
manual said several times... Unfortunately I don't own an oscilloscope. But 
the path from the terminal to the MMU looks o.k., it just doesn't work.

The other way (TXD) it's different. When I compare the RS232 monitor status 
with e.g. my OMNI VI, on the OMNI the LED is RED, on the K2 it's GREEN, i.e. 
wrong polarity. Also no flicker of the LED or voltage change when I try to 
send the test message. And nothing on the terminal (works fine with the OMNI, 
also at the same speed). And yes, of course I made a special cable for the K2 
according to the manual. The firmware is 2.03d by the way...

Rein PA0R

On Tuesday 09 March 2004 18:19, Jack Brindle wrote:
> 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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