All Hybird breakers communicate with the Edge Controller via RS485 using Modbus protocol. This article covers the correct wiring topology.

The RS485 bus must be wired as a daisy chain (also called multidrop). This means a single pair of wires runs from the controller to breaker 1, then from breaker 1 to breaker 2, and so on in sequence.

Do not use star topology (all breakers connected directly back to the controller) or T-taps (branches off the main bus). These cause signal reflections and communication errors.

Each Hybird installation package includes pre-cut RS485 wire rated for 110°C and 600V. The wire is cut to the length required to connect adjacent breakers on the DIN rail. Use this supplied wire for standard in-panel connections (up to approximately 30 metres total bus length).

For RS485 bus runs exceeding approximately 30 metres (e.g., between separate panels or across a building), use screened twisted pair cable. Connect the screen (shield) to the GND terminal on the controller. Install a 120 ohm termination resistor at each end of the bus.

For bus lengths exceeding approximately 500 metres, a repeater is required. Contact Hybird support to discuss repeater options for long-distance installations.

Note: there is no single maximum cable length that applies to all installations. Achievable distance depends on cable quality, routing, and electromagnetic noise in the environment. The 30-metre and 500-metre figures are practical guidelines.

Parameter Value Protocol Modbus RTU over RS485 Speed 500 Kbps Recommended max devices per controller 80 breakers (hard protocol limit: 247) Topology Daisy chain (multidrop) Supplied wire rating 110°C / 600V Extended runs (\>\~30m) Screened twisted pair, screen to controller GND Termination (\>\~30m) 120 ohm resistor at each end of bus Repeater required Bus lengths exceeding \~500m

For standard in-panel installations using the supplied pre-cut wire (up to approximately 30 metres total bus length), termination resistors are not required. For runs exceeding approximately 30 metres - particularly between panels or outside the enclosure - install a 120 ohm termination resistor at each end of the bus to prevent signal reflections.

Each breaker on the bus must have a unique Modbus ID. IDs are assigned during commissioning via Hybird OS. If two breakers share the same ID, communication conflicts will occur and one or both breakers may not report data correctly.

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