I'm looking to understand the 4-20mA https://www.dfrobot.com/product-2625.html Gravity: I2C 4-20mA DAC Module

That is I'm verifying the way it works and the software drives it.

Has anybody had success using it?

On the bottom it appears to be referencing the wrong schematic and IC. DAC Dual Voltage and GP8403 IC

but the IC GP8302 is in Chinese - is there an english translation.?

Even looking at the Chinese spec - I don't see what I would expect to be an I2C DAC registers.?

If something needs tweaking, how to understand the registers.

thanks if anybody has used it