cxmon
Access the Phocos CX/CXN-10/20/40 solar charge controller's logger.
...It should be compatible with Phocos CX/CXN-10/20/40 solar charge controllers. It has been tested with CXN-40 operating in 12 V mode.
The documentation can be found at the top of the executables. The tool is licensed under GPLv2.
The protocol has been reverse-engineered on the author's own free time. The author is not associated with Phocos in any way.
The advantages of the CXN-40 are: built-in logger, no RF noise (except for USB interface at HF frequencies while the port is open), good configurability, low self-consumption. ...