Advantech PCA-6181, Manual, Page: 36 / 126

2 2 PCA-6181 User's Manual
2.12 Front Panel Connectors (CN16, CN17,
CN18, CN19, CN21 and CN29)
There are several external switches to monitor and control the
PCA-6181.
2.12.1 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 LED (PS/2 power) LED (ATX power)
System On On On
System Suspend Fast flashes Fast flashes
System Off Off Slow flashes
2.12.2 External speaker (CN17)
CN17 is a 4-pin connector for an extenal speaker. If there is no external
speaker, the PCA-6181 provides an onboard buzzer as an alternative.
To enable the buzzer, set pins 3-4 as closed.
CN19
CN16
CN29
CN17
CN18
CN21