Advantech 2006957006 5th Edition Keyboard and PS/2 mouse connector CN5, Speaker, LED interface

2.11 Keyboard and PS/2 mouse connector (CN5)

The PCM-9570/S board provides a keyboard connector that supports both a keyboard and a PS/2 style mouse. In most cases, especially in embedded applications, a keyboard is not used. The standard PC/AT BIOS will report an error or fail during power-on self-test (POST) after a reset if the keyboard is not present. The PCM-9570/S’s BIOS standard setup menu allows you to select “All, But Keyboard” under the “Halt On” selection. This allows no-keyboard operation in embedded system applications without the system halting under POST (power-on-self-test).

2.12 Front panel connector (CN18)

Next, you may want to install external switches to monitor and control the PCM-9570/S. These features are optional - install them only if you need them. The front panel connector (CN18) is an 8-pin male, dual in-line header and 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-9570/S can drive an 8 Ω 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 PCM-9570/S watchdog timer times out, the front panel pin 6 will output an active low pulse signal (25mA sink rate for 1 second).

Chapter 2 Installation 19