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A Modbus wiring centre (typically RS485) acts as a centralized connection hub for devices like actuators, thermostats, and sensors, often used in HVAC systems (e.g., HR-03, HR-02C). It streamlines communication using daisy-chaining, requiring twisted pair shielded cables for reliability. Key requirements include A/B polarity consistency, proper termination resistors, and separating communication cables from power lines.
Key Modbus Wiring Guidelines:
- Topology: Use a daisy-chain (line) configuration, not a star or branch layout, to prevent communication errors.
- Cable Type: Use shielded twisted-pair cables (often 18 AWG) to ensure signal integrity.
- Termination: Install termination resistors at both ends of the main bus/cable run.
- Polarity: Connect A to A (or high) and B to B (or low) consistently across all devices.
- Shielding: Connect the cable shield to the ground at only one end to avoid ground loops.
- Distance: Keep communication cables at least 30 cm (11.8 in) away from power lines to reduce interference.
- Grounding: Ensure all Modbus devices share a common ground.
Common Wiring Centre Components:
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