[Elecraft] Serial IO/KIO2 is "deaf"

[W3FPR - Don Wilhelm]

Pieter,

Check the DC levels of the signal at the MCU end with your 'scope.  If it is
not getting up to 3 or more volts and/or does not drop to near zero volts,
it may not be properly sensed by the MCU.

You could also have a problem with marginal voltage swings on the RS-232
signal from the computer which could cause some bitsd in the data stream to
be improperly detected.  Another possible cause could be a weak MC1406 chip
in the KIO2.

73,
Don W3FPR

> -----Original Message-----
>
> Thanks, Jim.
> This is most bizarre!
> I have a scope and have checked that the rs232 signal goes right
> back to pin
> 26 on the MCU.
> I have also replaced the MCU (version 2.04P) with the previous
> version (2.03D)
> without result.
> Pieter
>
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