Front Panel Connectors; Keyboard Lock And Power On Led (Cn2); External Speaker (Cn3); Ide Led (Cn4) - SBC -775 Instruction Manual

There are several external switches to monitor and control the SBC-
775.

Keyboard lock and power on LED (CN2)

CN2 is a 5-pin connector for the keyboard lock and power on LED
connection. Refer to Appendix B.12 for detailed information on the
pin assignments. If a PS/2 power supply is used, the system's power
LED status will be one of the following:
PS/2 Power Mode LED Status
System On
System Suspend
System Off
If an ATX power supply is used, refer to Section 2.7.2.

External speaker (CN3)

CN3 is a 4-pin connector for an extenal speaker connection. If there
is no external speaker, the SBC-775 provides an on-board buzzer as
an alternative. To enable the buzzer, set pins 3-4 as closed.

IDE LED (CN4)

You can connect an LED to connector CN4 to indicate when the
HDD is active.

ATX soft power switch (J1)

If your computer case is equipped with an ATX power supply, you
should connect the power on/off button on your computer case to J1.
This connection enables you to turn your computer on and off.

Reset (J2)

Many computer cases offer the convenience of a reset button.
Connect the wire from the reset button to J2.
O n
Flashes eight times/sec.
O f f