Advantech DVMB-554E - Manual (Page 32)

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If fan is used, this connector supports cooling fans of 500 mA (6W) or less.
2.8 Front Panel Connectors (CNX1/CN13)
There are several external switches to monitor and control the DVMB-
554.
2.8.1 Power LED and Keyboard Lock (CN13)
CN13 is a 5-pin connector for the power LED. Refer to Appendix B for
detailed information on the pin assignments. If a PS/2 or ATX power sup- ply
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
2.8.2 External Speaker (CNX1-17)
It is a 4-pin connector for an external speaker. If there is no external speaker,
the DVMB-554E provides an onboard buzzer as an alternative. To enable the
buzzer, set pins 3-4 as closed.