Advantech PCM-5864, User Manual

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Chapter 2 Installation 25
2.12 Front panel connector (CN15)
Next, you may want to install external switches to monitor and
control the PCM-5864/E/L. These features are optional: install
them only if you need them. The front panel connector (CN15) is
an 8-pin male, dual in-line header. It provides connections for a
speaker, hard disk access indicator, watchdog output, and an input
switch for resetting the card.
2.12.1 Speaker
The PCM-5864/E/L can drive an 8 W speaker at 0.5 watts. Make
sure that alternatives to this specification do not overload the card.
2.12.2 LED interface
The front panel LED indicator for hard disk access is an active low
signal (24 mA sink rate).
2.12.3 Watchdog output
When the PCM-5864/E/L’s watchdog timer times out, the front
panel pin 6 will output an active low pulse signal (25mA sink rate
for 1 second).
2.12.4 Reset switch
If you install a reset switch, it should be an open single pole
switch. Momentarily pressing the switch will activate a reset. The
switch should be rated for 10 mA, 5 V.
If you need to make your own cable, you can find the pin
assignments for the board’s connector in Appendix C.