Interface Module for Protectowire Type CTI with LCD display and navigation buttons. The CTM-530 is a detection control module that acts as an interface between a fire alarm control panel detection circuit or addressable node and Protectowire CTI Linear Heat Detectors. The CTM-530 module can supervise up to 4,000 feet (1220m) in a Class A or Class B configuration. It is available with an intrinsic safety barrier for hazardous applications.