Sent an email to Oddwires through their contacts webpage, got a reply within minutes:toggle quoted messageShow quoted text
Hi Jerry, thanks for your inquiry. Board is configurable with a solder junction to 5 or 3.3V. Let me know if you need any more info. Thanks, Ian.
Very nice to have such a quick and concise response.
And he gave his direct line phone number with the response.
On Tue, Apr 10, 2018 at 10:06 am, Jerry Gaffke wrote:
The USB-to-UART cables sold for use by Arduino hobbyists generally have 0-5v logic levels,