pin header, 180degree, male. It provides connections for a speaker, hard disk access indicator.
2.19.1 HDD LED (CN19)
The HDD LED indicator for hard disk access is an active low sig- nal(24mA sink rate).
2.19.2 ATX power LED&KB-LOCK (CN16)
Power supply activity LED indicator and KB_lock funcation.
2.19.3 Speaker out(CN17)
Support a buzzer function, pin assignment refer to Appendix C.
2.20 COM port connector(CN9,CN10, CN29)
The PCI-6872 provides two serial ports (COM1: RS-232 and COM2: RS422/485)) in one COM port connector. It provides connections for serial devices (a mouse, etc.) or a communication network. You can find the pin assignments for the COM port connector in Appendix C.
2.21 Keyboard and PS/2 mouse connector (CN11)
The PCI-6872 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. If the keyboard is not present, the standard PC/AT BIOS will report an error or fail during power-on self- test (POST) after a reset. The PCI-6872'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.
2.22 External KB/mouse connector (CN12)
In addition to the PS/2 mouse/keyboard connector on the PCI-6872's rear plate, there is an additional onboard external keyboard
connector, allowing for greater flexibility in system design.
2.23 Watchdog output (CN18)
It provides connection for watchdog output, detailed pin assignment refer to appendix.
