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The RS-232 interface uses DTR and RTS to provide for + and - source. If you ground RTS and feed +9 to DTR you can "directly" read the RX with an arduino. Well, "directly" is not quite true, as the signal gets inverted but there is a package (CustomSoftwareSerial) that supports software serial with inverted logic and 7O1 (7bits odd parity).
HTH.
My UNI-T UT61E has a RS232 interface, not a USB interface.
I ended up modifying miniterm to set 7 bits as it allows me to set everything else, DTR to +5V, RTS to -5V, 19200, and odd parity.
(Actually, I think voltage is closer to +-6V...)
On piping serial to es51922 I had to modify it to make it work:
I needed just value - so not es51922 issue and I can work with es51922 stdout output
es51922 does not flush stdout so I added sys.stdout.flush()
and for your information,
With these changes I can do this:
Which generates a nice strip-chart-like graph of last 50 (in this case) values.
[diff.txt](https://github.com/pklaus/ut61e_python/files/681999/diff.txt)
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