EMB-2510 User's Manual6COM_DB:Signal Name Pin Signal NameCOM2_RX 1 2 COM1_RXCOM2_TX 3 4 COM1_TXGND 5 6 GNDCOM3_4:Signal Name Pin Signal NameNC 1 2 RS485+/RS232_RCOM4_RX 3 4 RS485-/RS232_TCOM4_TX 5 6 NCNC 7 8 NCGND 9 10 GND2.4.2 USB Port(USB12,USB34,OTG)EMB-2510 motherboard provides 5x USB ports;in which 2x USB3.0 and 2x USB2.0,1x OTG port.COM_DBCOM3_4