Intel DH55TC Product Guide - Page 49

Alternate Front Panel Power LED Header, Front Panel Header

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Installing and Replacing Desktop Board Components Pin Standard Signal Name ECP Signal Name 23 PERROR PE, ACKREVERSE# 24 GROUND GROUND 25 SELECT SELECT 26 KEY (no pin) KEY (no pin) EPP Signal Name PE GROUND SELECT KEY (no pin) Alternate Front Panel Power LED Header Figure 23, E 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 pin assignments for the alternate front panel header. Table 9. Alternate Front Panel Power LED Header Signal Names Pin Signal Name 1 Front panel LED+ 2 No pin 3 Front panel LED- In/Out Out Out Front Panel Header Figure 23, F shows the location of the front panel header. Table 10 shows the pin assignments and signal names for the front panel header. Table 10. Front Panel Header Signal Names Pin Description In/Out Pin Description Hard Drive Activity LED Power LED 1 Hard disk LED pull-up to +5 V Out 3 Hard disk active LED Out 2 Front panel LED+ 4 Front panel LED- Reset Switch On/Off Switch 5 Ground 7 Reset switch 6 Power switch In 8 Ground Power Not Connected 9 Power Out 10 No pin In/Out Out Out In NOTE When connecting individual wires from your chassis front panel to the front panel header, be sure to observe the connection polarity. Positive wires are usually solid color and negative wires are usually white or striped. 49

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Installing and Replacing Desktop Board Components
49
Pin
Standard Signal Name
ECP Signal Name
EPP Signal Name
23
PERROR
PE, ACKREVERSE#
PE
24
GROUND
GROUND
GROUND
25
SELECT
SELECT
SELECT
26
KEY (no pin)
KEY (no pin)
KEY (no pin)
Alternate Front Panel Power LED Header
Figure 23, E 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 pin 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 LED+
Out
2
No pin
3
Front panel LED-
Out
Front Panel Header
Figure 23, F shows the location of the front panel header.
Table 10 shows the pin
assignments and signal names for the front panel header.
Table 10. Front Panel Header Signal Names
Pin
Description
In/Out Pin Description
In/Out
Hard Drive Activity LED
Power LED
1
Hard disk LED pull-up to +5 V Out
2
Front panel LED+
Out
3
Hard disk active LED
Out
4
Front panel LED-
Out
Reset Switch
On/Off Switch
5
Ground
6
Power switch
In
7
Reset switch
In
8
Ground
Power
Not Connected
9
Power
Out
10
No pin
NOTE
When connecting individual wires from your chassis front panel to the front panel
header, be sure to observe the connection polarity.
Positive wires are usually
solid color and negative wires are usually white or striped.