Advantech PCA-6774, Руководство пользователя

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25 Chapter 2 Installation
2.21 Keyboard and PS/2 mouse connector (CN11)
The PCA-6774 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 PCA-6774
' 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 PCA-
6774'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.
2.24 Daughter card connector (CN27,CN28)
CN27, CN28 are 20 pin 180degree female connectors.With daughter
board, PCA-6774 can support 2 LAN and 4 USB ports. Detailed pin defi-
nition you will find in appendixC.