2-2
Table 2-1. NAC Card and Point Troubles
Type Trouble Message Possible Causes / Troubleshooting
NAC Circuit: SIG1
NAC Circuit: SIG2
NAC Circuit: SIG3
NAC Circuit: SIG4
Remove the field wiring from the NAC. Connect a 10K EOL resistor to
the NAC terminal on the panel and see if the trouble clears. Do one of
the following depending on whether the trouble clears.
• If the trouble does not clear, replace the SFIO board.
• If the trouble clears, there is a short or open somewhere on the field
wiring running between the NAC terminals on the SFIO and the
notification appliances.
AUX Circuit: AUX1 NAC Card Relay 1 status and configuration.
NAC
Point
Troubles
AUX Circuit: AUX2 NAC Card Relay 2 status and configuration.
Missing Card
Check the baud rate set on the SFIO. This trouble indicates that the
baud rate may be set to some value other than 9600, which is required
for normal operation.
Set the baud rate to 9600, as shown below.
OFF LINE
Black indicates switch
osition
9600
19,200
Wrong Card
This trouble indicates that the NAC card returned a card type as
something other than a NAC card type. Indicates either:
• Another slave card (LCD Annunciator, 24 Point I/O, RS-232, DACT,
or 4120 Network) has a card address of 1.
• The SFIO board is bad.
NAC
Card
Troubles
NACs 1 & 2 Class A
or
NACs 3 & 4 Class A
Check the following:
• Verify that a Class A adapter card is actually installed. This error
occurs if the NAC’s device type is Class A and the adapter card is
not installed.
• Power down the panel, remove the Class A card and reseat it in the
header on the NAC. Check to see that the pins of the Class A card
are properly seated in the header on the NAC card and power on
the panel. If the trouble does not clear, power down the panel
again and swap another Class A card in place of the suspect card.
If the problem still occurs, replace the SFIO board.
• Check the field wiring for opens and shorts.
Continued on next page
NAC Troubles
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