New. LEM-320 Loop Expander Module provide NOTIFIER’s ONYX Series of Fire Alarm Control Panels (FACPs) with Signaling Line Circuits (SLCs). The ONYX Series NFS-640/NFS2-640 supports one LEM-320; the NFS-3030/NFS2-3030 supports up to five LCM- 320s and five LEM-320s. The LEM-320 module is used to expand the NFS-640/NFS2-640 to a second loop, and to expand each LCM-320 used on the NFS-3030/NFS2-3030 – each NFS-3030/NFS2-3030 LCM-320 supports an expansion LEM-320.