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: Because the signal is defined by the difference in voltage between the two wires rather than a single wire's voltage relative to ground, it is highly resistant to electromagnetic interference (EMI).

The standard is a cornerstone of modern industrial and computer communications, primarily celebrated for its ability to maintain reliable data transfer over vast distances and in environments thick with electrical noise. Unlike standard consumer interfaces like USB, which are designed for short-range peripheral connections, RS-485 thrives in "multidrop" networks where dozens of devices must share a single communication line. The Core Principle: Balanced Differential Signaling : Because the signal is defined by the

: External noise typically affects both wires equally. Since the receiver only looks at the differential (A minus B), this "common-mode" noise is mathematically canceled out, ensuring that the data remains intact even near heavy machinery or power lines. Key Technical Advantages : Because the signal is defined by the