H a l f - s i z e C P U C a r d H S B - 6 6 8 IChapter 2 Quick Installation Guide 2-103 Power On Button(-) 4 Reset Switch(-)5 IDE LED(+) 6 Power LED(+)7 IDE LED(-) 8 Power LED(-)2.12 Front Panel Connector (FP2)Pin Signal Pin Signal1 External Speaker(+) 2 KeyBoard Lock (+)3 NC 4 GND5 Internal Buzzer(-) (Default) 6 I2C Bus SMB Clock7 External Speaker(-) (Default) 8 I2C Bus SMB Data2.13 RS232 Serial Port Connector (COM1/COM3/COM4)Pin Signal Pin Signal1 DCD 2 RXD3 TXD 4 DTR5 GND 6 DSR7 RTS 8 CTS9 RI 10 N.C2.14 RS232/422/485 Serial Port Connector (COM2)Pin Signal Pin Signal1 DCD(422TXD-/485DATA-) 2 RXD(422RXD+)3 TXD(422TXD+/485DATA+) 4 DTR(422RXD-)