On Mon, 08 Jan 2018 10:32:00 +0000 (GMT), Dave Liquorice wrote:

>> When I interpose the Nulsom ns-rs232 level shifter and loop pins 2
and
>> 3 back, about five characters can be typed, then characters quit
>> showing up in the terminal window.
>
> RTS/CTS connected or pulled up/down correctly?

Or dump the USB  serial device and connect the level shifter
directly to the Pi's serial IO.

--
Cheers
Dave.

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