If you have a digital volt meter you can check the voltages at your battery terminals with the unit plugged into shore power.
When you first connect to shore power the voltage should be 14.2-14.4V; dropping to 13.6 volts once battery is near charged, and dropping again to 13.2V once fully charged.
Here is the algorithm for the PD9200 series -->
Clicky here
The PD Charge Wizard pendant is a good adder to watch your converter and battery charge status.
Hope this helps.
Brian