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2.8.1 LED and Buzzer for System Diagnosis
In a "headless application" (an application without a monitor display), it
is always difficult to know the system status. Another PC may be needed
to monitor a headless device's status via RS-232 or Ethernet. In order to
solve this problem, UNO-3072A/3074A offers a solution which can turn
the four LED originally used for COM port Tx & Rx to programmable
LED indicators while. They can be programmed to show a systems status
by LED indicator.
In order to use programmable LED, user needs to change BIOS setting to
switch the LED for COM port Tx & Rx to programmable LED function.
Please follow the steps below:
1.
Boot up or reset the system, press Del to enter into BIOS
2.
Select Integrated Peripherals
Default setting is "Comport TX-RX", change the setting to "Pro-
grammable LED".
3.
Press F10 or Back to "Save and Exit Setup" to finish setup change.
Table 2.15: LED Control Register
212H
R/W
Note:
Px: = 0, DIAG LED disable
UNO-3072A/3074A User Manual
Figure 2.12: Programmable LED
Diagnostic / Programmable LED Register
x
x
x
= 1, DIAG LED enable
Onboard Device
x
P1
P2
30
LED Select,
P3
P4
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