How do I connect a UDACT to the NFS2-640 for central station monitoring?
To connect a UDACT or UDACT-2 to an NFS2-640 for central station monitoring, wire the communicator to the panel's EIA-485 ACS port and provide non-resettable power. This application requires 24 hours of standby power and 5 minutes of alarm power (Page 49) [1].
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Connect Power: Wire the UDACT to the FACP's non-resettable 24VDC power terminals (Page 49) [1].
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Connect Communication: Wire the supervised EIA-485 (ACS Mode) loop from the FACP to the UDACT (Page 49) [1].
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Install Termination: If the UDACT is the last or only device on the EIA-485 line, install a 120-ohm End-of-Line resistor (P/N 71244) across TB1 terminals 3 and 4 (Page 49) [1].
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Connect Phone Lines: Connect the UDACT to two supervised telephone lines using the provided ferrite cores (P/N 29090) (Page 49) [1].
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Verify Grounding: Ensure the FACP cabinet has a solid earth ground connection (Page 49) [1].