Biostar M6TSU User Manual page 31

Chapter1
Connectivity
The serial port can be used many ways, and it may be necessary to become
familiar with the pin-out diagram. The following chart gives you the function of
each pin on the 9-pin connector and some of the 25-pin connector. This
information can be used when configuring certain software programs to work with
the serial port.
Signal
DCD
RX
TX
DTR
GND
DSR
RTS
CTS
RI
Name
Data Carrier Detect
Receive Data
Transmit Data
Data Terminal Ready
Signal Ground
Data Set Ready
Request to Send
Clear to Send
Ring Indicator
1-25
Motherboard Description
DB9 PIN DB25 PIN
1 8
2 3
3 2
4 20
5 7
6 6
7 4
8 5
9 22