I'm not talking to it yet, I was hoping someone might find the pi software they had used to decipher the serial data coming from the controller (hint, hint, grin!)!
I was able to connect my laptop into the serial port, but wanted the pi to be able to poll the data and then for me to be able to utilize it.
It is the charge controller (MPPT) for the Solar Batteries.
The 3 other sets are using MorningStar PWM controllers.