What are the available hardware expansion modules for EC312?

FAQ
1
The EC312 supports several optional modules to add specific I/O capabilities:
NAAD: 2x Analog Inputs (4-20mA), 4x DI, 4x DO.
N44C: 2x RS-485, 1x CAN FD.
N44C: 2x RS-485, 1x CAN FD.
N4CC: 1x RS-485, 2x CAN FD.
N44D: 2x RS-485, 4x DI, 4x DO.