19 Chapter 2 Installation2.20 COM port Connector (CN6,CN12,CN13)The PCI-6881 provides four COM ports (COM1,COM3,COM4: RS-232and COM2: RS-232/422/485). CN12 supports COM1, CN13 supportsCOM2, CN6 supports COM3, COM4. And JP2 is for COM2 RS-232/422/485 selection. It provides connections for serial devices (a mouse,etc.) or a communication network. You can find the pin assignments forthe COM port connector in Appendix B.2.21 MINI Keyboard Connector (CN17)The PCI-6881 board provides a keyboard connector that supports both akeyboard and a PS/2 style mouse. In most cases, especially in embeddedapplications, a keyboard is not used. If the keyboard is not present, thestandard PC/AT BIOS will report an error or fail during power-on self-test (POST) after a reset. The PCI-6881’s BIOS standard setup menuallows 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 Keyboard Connector (CN18)In addition to the Mini keyboard connector on the PCI-6881’s rear plate,there is an additional onboard external keyboard connector, allowing forgreater flexibility in system design.2.23 Audio Interface Connector (CN15)The Audio Interface link is a 10 pin connector, the PCI-6881 can supportAudio with the addition of optional PCM-231A-00A1. Detailed pinassignment refer to Appendix B.2.24 DI/O Connector (CN16)The PCI-6881 supports DI/O interface by CN16, which is a 7 x 2 dualline pin header, supply 8-bit general purpose input or output ports.
