This is a cheap lab bench power supply that given its flaws is a surprisingly solid piece of equipment. I wouldn’t call this a precision power supply, but its tolerances and ripple are acceptable for ordinary bench work. (And really, if you’re doing precision work, you’ll invest in a precision supply anyhow.)
There are two methods for communicating with the unit: a serial interface and a proprietary binary USB interface. One may use either the DB-9 connector or USB to access the serial interface.
I wrote a Python wrapper for the serial protocol to encapsulate the various tidbits of information I’ve encountered on the Internet. The firmware is buggy and there are various gotchas. Hopefully the Python wrapper will address the worst of the problems one might encounter.