Some newer mac os x versions may be in conflict with USB dongle’s driver (chipset = CH340) leading to a computer crash when the dongle is inserted in any USB port. The problem is solved by removing the old driver and installing a new one (more details and help here or here).
A functional setup should see data coming from the Charge Doctor, check it using an ascii console set at 9600 bds.

ascii data from the Charge Doctor

Data can be plotted using a grapher, for example « Plot2 ». Probably not the best one because of its un-intuitive and ugly user interface but still good enough for the purpose. A free version exists (with some nag screens) and is downloadable from the App Store.

graphic display of data by « Plot2 »

attribution : images & data by Henrik M.