“I have not done a diagram for the rotary encoders, as it’s a bit redundant… they are connected directly to the first four DIN modules on the base PCB (i.e. JD1 to JD4) as per the normal way of connecting rotary encoders to DIN modules. Just like the LEDs and switches, you can assign them to any pins of DIN modules and configure this in the table in the .asm file.”
You can find out, how they are actually connected by tracing the PCB .pdfs: