PCM-3353 User Manual 14Momentarily pressing the reset button will activate a reset. The switchshould be rated for 10 mA, 5 V.2.11 Audio interfaces (CN34/35)2.11.1 Audio connector Audio-out(CN35), Audio-in(CN34)The board provides all major audio signals on a 8-pin cable connector,These audio signals include Microphone in (mono), Line in (stereo) andLine out (stereo).2.12 COM port connector (CN20,CN30)The board provides four serial ports: Four serial RS-232 ports in one 40pin connector (CN30: COM1/2/3/4). It provides connections for serialdevices or a communication network. You can find the pin assignmentsfor the COM port connector in Appendix C.2.12.1 Serial Port RS-422/485 (CN20)Serial port can be configured to operate in RS-422 and RS-485 mode. RS-422 and RS-485 in one pinheader (CN20) and can be configured viaCN39 connector.2.13 VGA/LCD interface connectionsThe board’s PCI SVGA interface can drive conventional CRT displaysand is capable of driving a wide range of flat panel displays.2.13.1 CRT display connector (CN27)The CRT display connector is a 15-pin D-SUB connector used for con-ventional CRT displays.2.13.2 TTL TFT LCD connector (CN4)Table 2.3: Serial Port RS-422/485 (CN39)Setting Function1-2 RS-2323-4 RS-4855-6 RS-422
