Why is the communication unstable / causing errors?

Octopuscon 7/8" Bus Fault Troubleshooting Principle

Common Fault Causes : Pin misconnection, poor contact, improper grounding, missing terminal resistors and electrical interference are the main reasons for bus communication failure.

Common Causes of Bus Communication Failure

Wiring & Grounding Faults

Pin Connection Issues :
• Incorrect pin wiring or poor contact
• Leads to signal interruption or unstable transmission
Shield Grounding Fault :
• Ungrounded shield layer of cable
• Reduces anti-interference capability significantly

Impedance & Interference Faults

Terminal Resistor Missing :
• No 120Ω terminal resistor at both ends of the bus
• Causes signal reflection and communication failure
Strong Electrical Interference :
• Interference from high-voltage power lines
• Solution: Use shielded cables for bus wiring

Technical Note: When troubleshooting bus faults, first check pin connection and 120Ω terminal resistors , then verify shield grounding and use shielded cables to avoid strong electrical interference for stable communication.

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