User`s manual

SBC86834 All-In-One Mini ITX Board User’s Manual
Jumpers and Connectors
35
2.4.21 COM1, COM2 Port Connector (CN4)
CN4 is a double deck D-Sub connector. The upper CN4A is a standard
9-pin DB9 connector for the Serial Port1 RS-232, 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 Ground (GND)
6 Data Set Ready (DSR)
7 Request to Send (RTS)
8 Clear to Send (CTS)
9 Ring Indicator (RI)