[K2] looking for method to get K2 to send serial output via KIO2 without prompt

[inventor61 .]

My K2 #771 has a KIO2 that has no serial data output.

This appears to be due to a problem ... in the other direction.

I can see my inbound ASCII commands (e.g., FA;) at pin 6 of U1 on the KIO2
board.

However, the MAX1406 shows only rail at the corresponding TTL side.

I presume the MAX1406 has popped ...

It would be great if I could see if it worked "the other way" in other
words, if the K2 could somehow be made to send at least something out the
TX port without being prompted.

As you can see, because the KIO2 appears to not be able to send the
received data to the main MCU, I can't get the MCU to speak.

All other radio features operate perfectly.  #771 will be 20 years old this
December.

Any ideas?  Other than the obvious 'replace the MAX chip and see what
happens.'

Steve KZ1X
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[Ingo Meyer, DK3RED-2]

Hello Steve,


> It would be great if I could see if it worked "the other way" in other
> words, if the K2 could somehow be made to send at least something out the
> TX port without being prompted.
>
> As you can see, because the KIO2 appears to not be able to send the
> received data to the main MCU, I can't get the MCU to speak.

It should be possible, because the terminal program can i.e. ask for the frequency and the
K2 will answer via KIO2.


73/72 de Ingo, DK3RED - Don't forget: the fun is the power!
www.qrp4fun.de - [hidden email]
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[Don Wilhelm]

Steve,

If the problem is that you just don't want to change out the MAX1406,
there are 2 unused TX/RX sections in the implementation in the KIO2.
You just need to cut the traces to the in and out pins used and wire to
another pair of pins.

OTOH, just replacing the MAX1406 may be just as easy.

73,
Don W3FPR

On 6/9/2019 12:11 PM, inventor61 . wrote:

> My K2 #771 has a KIO2 that has no serial data output.
>
> This appears to be due to a problem ... in the other direction.
>
> I can see my inbound ASCII commands (e.g., FA;) at pin 6 of U1 on the KIO2
> board.
>
> However, the MAX1406 shows only rail at the corresponding TTL side.
>
> I presume the MAX1406 has popped ...
>

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