Advantech PCA-6774 ATX Power & HDD LED, speaker out Connector CN16, CN17, CN19, HDD LED CN19

2.19ATX Power & HDD LED, speaker out Connector (CN16, CN17, CN19)

Next, you may want to install external switches to monitor and control the PCA-6774. These features are optional: install them only if you need them. CN16, CN17, CN19 integrated in one connector, which is an 5 x 3 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 signal (24mA sink rate).

2.19.2ATX power LED & KB-LOCK (CN16)

Power supply activity LED indicator and KB_lock function.

2.19.3Speaker out (CN17)

Support a buzzer function, pin assignment refer to Appendix B.

2.20 COM port connector (CN9,CN10,CN29)

The PCA-6774 provides two serial ports (COM1: RS232 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 B.

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.

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