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IMB203 LGA775 ATX Motherboard User's Manual
2.4.3 COM2~COM4 Connectors (CN16, CN19, CN25)
The board has the onboard serial ports COM2~4 (CN16, CN19, CN25),
three 2*5-pin 2.54 pitch box-header to support RS-232.
Pin
Signal
Data Carrier
1
Detect (DCD)
Receive Data
3
(RXD)
Transmit Data
5
(TXD)
Data Terminal
7
Ready (DTR)
9
Ground (GND)
2.4.4
Audio Connector (CN3)
Color
Green
Red
14
Pin
Signal
Data Set Ready
2
(DSR)
Request to Send
4
(RTS)
Clear to Send
6
(CTS)
8
Ring Indicator (RI)
10
NC
Signal
LINE_OUT
MIC_IN
Jumpers and Connectors
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