Various settings are stored into a setting storage table for stop-key processing. The memory card connector includes an insulating body having a plugging slot and two pivoting bases, two locking parts, and a plurality of conducting pins received in the insulating body. Each VLAN supports multiple priorities. The lower limit position located below a stacking tray on the upper side when this large capacity stacking mode is selected exists at a position in which it blocks a lower discharge port of sheets.