Front Panel Connectors (Cn16, Cn17, Cn18, Cn19, Cn21 And Cn22); Keyboard Lock And Power Led (Cn16); External Speaker (Cn17); Table 2-2: Ps/2 Or Atx Power Supply Led Status - Advantech PCA-6277V-00A1 Manual

2.15 Front Panel Connectors (CN16, CN17,
CN18, CN19, CN21 and CN22)
There are several external switches to monitor and control the
PCA-6277.

2.15.1 Keyboard lock and power LED (CN16)

CN16 is a 5-pin connector for the keyboard lock and 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 2-2: PS/2 or ATX power supply LED status

Power mode
System On
System Suspend
System Off

2.15.2 External speaker (CN17)

CN17 is a 4-pin connector for an extenal speaker. If there is no
external speaker, the PCA-6277 provides an onboard buzzer as an
alternative. To enable the buzzer, set pins 3-4 as closed.
LED (PS/2 power)
On
Fast flashes
Off
Chapter 2 Connecting Peripherals
CN21
CN29
CN19
CN17
CN16
LED (ATX power)
On
Fast flashes
Slow flashes
CN18
33