User`s manual

Chapter 2 Installation 29
2.16.5 Audio power source setting (J23)
The PCM-5864 is designed to work with a single +5 V power
supply. The audio interface can also function normally under
single +5V power supply, but most audio controllers require an
independent power source generated from a +12 V power supply.
The independent power source avoids the noise from the other
digital circuits. The PCM-5864‘s audio interface can accept +12 V
power to provide improved quality audio. This is done via J23.
Table 2-11: Audio power source setting
*+5 V +12 V
1 2 3 1 2 3
J23
* default setting
Configuration of the audio interface is done entirely via the
software utility. You do not have to set any jumpers. Refer to
Chapter 6 for audio setup details.
2.17 COM port connector (CN23)
The PCM-5864/L provides four serial ports (COM1, 3, 4: RS-232;
COM2: RS-232/422/485) in one COM port connector. The COM
port connector is a 40-pin, dual-inline, male header. 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.
2.17.1 COM2 RS-232/422/485 setting (J19, J20,
J21)
COM2 can be configured to operate in RS-232, RS-422, or RS-
485 mode. This is done via J19 and J20.