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System Architecture The HCCM-2100 System can be configured as a star or bus network using heating cable and/or power wiring as the communication media as shown in Figure 4. The system is comprised of NC-2104 Network Controllers and RT-2104 Remote Terminals. Each NC-2104 unit can simultaneously communicate with multiple remote terminals in order to monitor and control multiple heat-tracing circuits. Each sensor on the system represents an indication and control “zone” on the network controller. Configured as a token ring network, multiple network controllers can be interconnected via power line, fiber-optic or twisted shielded cable to meet application requirements. Each remote terminal is uniquely addressed to a specific network controller. The system supports simultaneous communication between multiple network controllers their respective remote terminals.