Notifier NCA-2 Network Control AnnunciatorNotifier NCA 2 Network Control Annunciator [NEW] As a remote node on a network, it provides both system control and display capabilities for all network nodes. Requires 24 VDC, and either a network connection*** or a direct connection to the NFS 640 or NFS 3030. ***For network displaying, an NCM W (wire) or NCM F (fiber optics) Network Communications Module is also required.