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RS-485 Termination and Bias Resistor: Practical Calculation and Troubleshooting
RS-485 is widely used in industrial automation systems to connect PLCs, robots, PCs, remote I/O, sensors, and controllers. Although RS-485 is designed for reliable differential communication, incorrect termination, biasing, wiring, or grounding can cause intermittent communication problems. This article explains how to calculate the termination and bias resistors in a practical RS-485 network. 1. Basic…