Advantech AIMB-744 Series, User Manual

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25 Chapter 2
2.11.1 Power LED and Keyboard Lock (CN16)
CN16 is a 5-pin connector for the power on LED. Refer to Appendix B
for detailed information on the pin assignments. If a PS/2 or ATX power
supply is used, the system's power LED status will be as indicated below:
Table 2.1: PS/2 or ATX power supply LED status
Power mode LED (PS/2 power) LED (ATX power)
System On On On
System Suspend Fast flashes Fast flashes
System Off Off Slow flashes
2.11.2 External speaker (CN17)
CN17 is a 4-pin connector for an external speaker. If there is no external
speaker, the AIMB-744 provides an onboard buzzer as an alternative. To
enable the buzzer, set pins 3-4 as closed
2.11.3 Reset (CN18)
Many computer cases offer the convenience of a reset button. Connect the
wire from the reset button
2.11.4 HDD LED (CN19)
You can connect an LED to connector CN19 to indicate when the HDD is
active.
2.11.5 ATX soft power switch (CN21)
If your computer case is equipped with an ATX power supply, you should
connect the power on/off button on your computer case to CN21. This
connection enables you to turn your computer on and off.
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