User`s manual

IMB205 LGA1156 ATX Motherboard User’s Manual
Jumpers and Connectors
18
2.4.3 COM1/2 Connector (CN3)
CN3 is a double deck D-Sub connector. The upper CN3A is a standard
9-pin DB9 connector for the Serial Port1 RS-232(COM1), jumper
selectable with the +5V/12V power capability is on DCD and RI,
depending on the jumper setting.
Pin Signal
1 Data Carrier Detect (DCD)
2 Receive Data (RXD)
3 Transmit Data (TXD)
4 Data Terminal Ready (DTR)
5 GND
6 Data Set Ready (DSR)
7 Request to Send (RTS)
8 Clear to Send (CTS)
9 Ring Indicator (RI)
CN3