Modern industrial networks rely on robust RS485 communica-tion links for long distance data transmission, so protecting sig-nal clarity can be a challenge. These networks must operate in harsh industrial environment and hence are subject to strong electromagnetic interference in the form of large transient voltages caused by electrostatic discharge, electrical fast transients, and lightning strikes. Data rates for long distance communication range from 10 kbps up to 250 kbps over distances of up to 4000 ft (1200 m) and lately even up to 6000 ft (2000 m). Due to its differential signaling technique across twisted-pair cable and the ability to operate reliably in a high-common-mode environment, RS485 has become the interface workhorse in industrial applications.
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