Ingo
I agree, that would be ideal.
The problem, of course, is that if the MCU never gets the TTL equivalent of
the ASCII request, it won't respond.
Hence the issue.
What I had hoped to find out is if there's any keyboard or other sequence
that would cause the K2 to send data autonomously ... again, without any
data prompt.
This ability would allow me to show that the TX data side of the setup was
in fact operational.
I have since that message used an oscilloscope to see that the ASCII RS-232
data **is** getting level-translated and DOES appear on the correct pin of
the main MCU, revision 2.04 firmware.
I swapped out the v2.04 MCU for an earlier revision chip I had in the
junque drawer..
This older chip may or may not have had the same problem.... it's been
years since I upgraded to the 2.04 firmware so I do not recall ... and
since both MCUs exhibit the same lack-of-response to any inbound serial
command, I suspect I need a new MCU, not the Maxim chip.
Steve KZ1X
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