6(COM 1 with 5V/12V Power Output on 9 Pins, BIOS) (COM2~3 RJ-45 , Full Signal) (COM5 Reserved for Cash Drawer Port) (COM4 RJ-11, Only TX/RX, 12V Power Output, Reserved for 2×20 Customer Display) (COM6 RJ-45, Only TX/RX, 5V Power Output, Reserved for MSR)