First: This should probably be moved to the developer's corner.
The question is answered in a topic in that board here:
https://www.mobileread.com/forums/sho...40&postcount=4
Be sure to have a 1.8volts UART adapter to connect it to. Anything higher puts your device in danger of being fried completely. So: no classic PC serial port (without level converter), no 5v, no 3.3v. Yes, 1.8v adapters are still rare.