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].
Connect Power: Wire the UDACT to the FACP's non-resettable 24VDC power terminals (Page 49) [1].
Connect Communication: Wire the supervised EIA-485 (ACS Mode) loop from the FACP to the UDACT (Page 49) [1].
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].
Connect Phone Lines: Connect the UDACT to two supervised telephone lines using the provided ferrite cores (P/N 29090) (Page 49) [1].
Verify Grounding: Ensure the FACP cabinet has a solid earth ground connection (Page 49) [1].
