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2.14.1 Audio connector (CN3)
The POS-761FA provides all major audio signals on a 16-pin flat-cable
connector, CN3. These audio signals include Microphone in (mono), Line
in (stereo), Line out (stereo), and Speaker out (stereo). You will need an
adapter cable if you use traditional telephone jack connectors for these
audio signals.
2.14.2 CD audio-in connector (CN2)
All CD-ROM drives can provide analog audio signal output when used as
a music CD player. The CN2 on POS-761FA is a connector to input CD
audio signal into the audio controller. The audio cable of your CD-ROM
drive will be used to connect to CN2.
2.15 Serial (COM1- 4)(CN20/21,CN14/16,CN25,CN22)
The POS-761F has a total of four on-board RS-232 serial ports, COM1-4.
They are differentiated by COM1 and COM2 (RS-232/422/485) as pri-
mary serial ports and COM3 and COM4 as secondary ports. All four
serial ports have +5 V and +12 V power capabilities on both pin #1 and
pin #9, depending on the jumper setting. Pin assignments for both internal
and external COM ports can be found in the appendix.
2.15.1 Primary(COM1:CN20/CN21,COM2:CN14/CN16)
Each primary serial port has two connections, one external DB-9 and one
internal 10-pin header giving the user the flexibility to adapt the board to
many different systems. IRQ for COM1 and COM2 is fixed with COM1
on IRQ4 and COM2 on IRQ3. COM1 and COM2 can be enabled or dis-
abled via BIOS (see Chapter 4).
2.15.2 Secondary(COM3: CN25, COM4: CN22)
The secondary serial ports each have one 10-pin, internally positioned
header connection. The IRQ for COM3 is fixed at IRQ10 and COM4 is
fixed at IRQ5. COM3 and COM4 can be enabled/disabled via BIOS (see
Chapter 4).
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Chapter 2
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