Installing and Replacing Desktop Board Components
49
Alternate Front Panel Power LED Header
Figure 24, D shows the location of the alternate front panel power LED header. Pins 1
and 3 of this header duplicate the signals on pins 2 and 4 of the front panel header. If
your chassis has a three-pin power LED cable, connect it to this header. Table 9
shows
the p
in assignments for the alternate front panel header.
Table 9. Alternate Front Panel Power LED Header Signal Names
Pin Signal Name In/Out
1 Front panel green LED Out
2 No pin
3 Front panel yellow LED Out
Consumer IR (CIR) Headers
The Desktop Board has two CIR headers: the input or receiver header (Figure 24, F)
and the output or emitter header (Figure 24, E). The receiver header consists of a
filt
ered translated infrared input compliant with Microsoft CIR specifications and a
“learning” infrared input. The learning input is a high-pass input which the computer
can use to “learn” to speak the infrared communication language of other user
remotes. The emitter header consists of two output ports which the computer can use
to emulate “learned” infrared commands in order to control external electronic
hardware.
NOTE
The Consumer IR option must be enabled in the system BIOS before it can
function. Press <F2> at boot to enter the system BIOS, and go to Advanced >
Peripheral Configuration > Enhanced Consumer IR, and set this option to
Enabled.
Table 10 shows the pin assignments and
signal names for
the front panel CIR receiver
(input) header and Table 11 shows the pin assignments and signal names for the back
panel
CIR emitter (output) header.
Table 10. Front Panel CIR Receiver (Input) Header Signal Names
Pin Signal Name Pin Signal Name
1 Ground 2 LED
3 No Connection 4 Learn-In
5 +5 V Standby 6 Vcc
7 Key (no pin) 8 CIR Input
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