Advantech PCM-9377, Руководство пользователя

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19 Chapter 2
2.12.2 Audio power source setting (J5)
The board is designed to work with a 5 volts power supply as
audio interfaces usually function under +5 volts. However, most audio
controllers require an indep12 volts power source since this
avoids noise interference from other digital circuits. By using J5, the
board’s audio interface can also 12 V power sources for
improved audio quality. Configuration of the audio interface is done com-
pletely via software utilities. You don’t have to set any jumpers. For fur-
ther information, please refer to Chapter 5 for audio setup details.
2.13 COM port connector (CN21,CN22)
The board provides two serial RS-232 ports in one DB-9 connector and
one box header with auto-flow control. 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.
2.13.1 Serial Port RS-422/485 (J4)
Serial port can be configured to operate in RS-422 and RS-485 mode.
This is done via setting jumper J4.
2.14 VGA/LCD/LVDS interface connections
The board’s PCI SVGA interface can drive conventional CRT displays
and is capable of driving a wide range of flat panel displays.
Table 2.8: Audio Power (J5)
Setting Function
1-2* +12 V
2-3 +5 V
*: default
Table 2.9: COM2 & WDG Select (J4)
Setting Function
1-2 RS485
3-4 RS422
5-6* RS232
7-8* Reset System
9-10 Clear IRQ11
*: default