2-5
CPU, Continued
CPU LEDs
CPU jumper
settings
Table 2-5. Bootloader status LEDs
Reference
designator
LED7 LED8 LED9 LED10
Silkscreen
Name
AB C D
Color Green Green Green Green
Status
Bootloader
Initialization
On (0.25 s)
Off (0.25 s)
On (0.25 s)
Off (0.25 s)
On (0.25 s)
Off (0.25 s)
On (0.25 s)
Off (0.25 s)
Bad Master
CRC or No
Master
Present
Off Off Off On
Diagnostic
Fail - RAM
On Off Off On
Diagnostic
Fail -
Bootloader
CRC
Off On Off On
Downloading
Master
On On Off On
Downloading
CFIG
Off Off On On
Downloading
MsgLib
On Off On On
Downloading
Bootloader
Off On On On
Download
Successful
On On On On
Table 2-6. CPU settings
Reference designator Silkscreen name Position Function
P5 BATTERY
1-2 Enable RAM battery backup
2-3 (default) Disable RAM battery backup
P1 RUI CKT
1-2 (default) Disable RUI
2-3 Enable RUI
P2 RUI SHIELD
1-2 (default) RUI shield tied to 24C (Note)
2-3 RUI shield tied to earth
Note: Some devices that connect to RUI have inherently grounded shield terminals, in which case, 24C
cannot be used. If 24C is used, a negative earth fault will occur.
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