SOYO SY-5S - Manual (Page 25)

Quick Installation Guide SY-5STM
21
Step 10. Other Connections
1. Serial Port COM 2
In addition to the onboard serial connector COM1 located at the rear
panel, your mainboard comes with a second serial port COM2
equipped with a flat cable and external connector.
The mainboard package includes one 9-pin male external serial
connector with 9-pin flat cable.
Plug the 9-pin end of the flat cable into the COM2 serial connector
on the mainboard, as shown in the figure below, then fix the external
9-pin or 25-pin connector to the rear panel of the computer case.
Then plug your serial device cable directly into this 9-pin male
connector located at the back of your computer.
ATX
Power
COM 2
9-pin serial
flat cable
9-pin male external
serial connector