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8.6
POST CODE LEDS (DTI Baseboard Only)
Four surface-mounted LEDS are located on DTI baseboards for the ETX-LX15 that indicate the
post/board status. The LEDS are arranged from the most significant bit (MSB) to the least significant bit
(LSB), and a color scheme is used to identify the bit values. For instance, the LED will be lit RED when
one of the upper four bits is high and will be lit GREEN when one of the lower bits is high. The upper and
lower bits will be represented simultaneously by the LEDS. Thus, the LED will appear ORANGE if one of
the upper and lower bits is both high in the same bit location. These eight bits represent a binary number,
and if that binary number is converted into a hexadecimal number you’ll have the failing code if the board
fails to boot. An example illustrating this is provided below.
LED Color Description
R=RED
G=GREEN
O=ORANGE
F=OFF
Bit in the upper nibble is high:
POST CODE 20 --- BIT values (MSB to LSB) 0010 0000
I
I
Upper Nibble
Lower Nibble
LEDS Status MSB to LSB
Visible colors: FFRF (Off Off Red Off)
Bit in the lower nibble is high:
POST CODE 02--- BIT values (MSB to LSB) 0000 0010
I
I
Upper Nibble
Lower Nibble
LEDS Status MSB to LSB
Visible colors: FFGF (Off Off Green Off)
Bits in the same location are both high:
POST CODE 33 --- BIT values (MSB to LSB) 0011 0011
I
I
Upper Nibble
Lower Nibble
LEDS Status MSB to LSB
Visible colors: FFOO (Off Off Orange Orange)
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