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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