The main module board comes in a 10-slot configuration.

If 10 slots are insufficient, a 5-slot extension board can be connected to the 10-slot board to increase the capacity for additional modules.

If 15 slots are still not enough, an additional 5-slot Extension board can be connected increasing the capacity to a maximum of 20 modules.

The module board array must be terminated, so if you connected additional module boards, be sure to terminate the last board in the array. A terminator is included with each board.