Understanding EIA-485 Termination and Bias


The Understanding EIA-485 Video Series discusses the popular EIA-485 technology— commonly called RS-485 — used for interconnecting network devices.

In this video we discuss two important issues with multipoint systems — termination and bias. Terminating a data cable properly reduces reflections that could cause data errors. Correct bias assures that each device on the bus properly interfaces with the bus for reliable operation.

Related Videos

Understanding EIA-485 Part 1: Introduction
TIA standard, general electrical characteristics and the various technologies that use EIA-485. (4:36)

Understanding EIA-485 Part 3: Connectors, Grounding and Protection
Review the importance of connectors as well as grounding, especially the distinct needs of two-wire and three-wire systems. (6:36)

Understanding EIA-485 Part 4: Cabling and Repeaters
Cables attenuate and distort signal, so cable selection depends on data rate, encoding, distance. Repeaters that use the data link protocol are more reliable than basic EIA-485 repeaters. (5:35)

Understanding EIA-485 Part 5: 10 Recommendations
To complete our series on Understanding EIA-485 Networks, here are 10 recommendations for implementing the technology. (3:15)