Mainboard KX550
14
Speaker Header: SPEAK
A speaker cable on your case front panel can be attached to this header. When you reboot the
computer, this speaker will issue a short audible (beep). If there are problems during the Power
On Self-Test, the system will issue an irregular pattern of audible beeps through this speaker.
Headers & Jumpers
Serial Interface Header: COM1
This mainboard provides one COM1 header for you to connect an
external serial connector on the back panel of your case. Attaching the
serial connector by a cable (Optional) onto this header, then you can
use the serial connector to attach with a mic, modem or other peripheral
device.
IrDA Header: IR
The infrared sensing device attached to this header can support to provide wireless infrared.
You can transfer data connectionless to or from the portable device (i.e., laptop, PDA, etc.)
which with this header attached.
Front USB Headers: USB1/2/3
This mainboard provides four onboard USB 1.1/2.0 ports (back panel) that attach to USB
devices. There are three additional USB headers that can be connected by cables to six more
USB ports on the front panel of your case giving you a possible ten USB ports.
Pin
Assignment
Pin
Assignment
1 SPK
2 N/A
SPEAK
3 Ground
4 VCC5
Pin
Assignment Pin
Assignment
1 IRRX
2 GND
3 GND
4 N/A
IR
5 IRTX
6 VCC
Pin
Assignment
Pin
Assignment
1 VCC
2 VCC
3 -DATA
4 -DATA
5 +DATA
6 +DATA
7 GND
8 GND
USB1/2/3
9 Key
10
N/A
