• CPUA and CPUB microprocessors
• EEPROM / FRAM for inventory, identification and fault information
• Lightning protection for the RS485 ring/arm interfaces
• Diagnostic LEDs
Reference section 3.16 for further information.
2.1.3 Nodes and Bypass Module
An example of a Node is the RAG Node. This is typically fitted inside the green aspect of the Helios
signal. It operates as a fail-safe unit which ensures that the LED signals are guaranteed to be off
in the event of any malfunction.
Figure 3 : Bypass Module and RAG Node
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