Appendix E

E. 2 Line Termination

Each discontinuity in impedance causes reflections and distortion. When an impedance discontinuity occurs in the transmission line the immediate effect is signal reflection. This will lead to signal distortion. Specially at line ends this mismatch causes problems. To eliminate this discontinuity terminate the line with a resistor.

Figure E-4Signal Distortion

The value of the resistor should be a close as possible to the characteristic impedance of the line. Although receiver devices add some resistance to the whole of the transmission line, normally it is sufficient to the resistor impedance should equal the characteristic impedance of the line.

Example:

Each input of the receivers has a nominal input impedance of 18 kW feeding into a diode transistor- resistor biasing network that is equivalent to an 18 kΩ input resistor tied to a common mode voltage of

2.4V. It is this configuration which provides the large common range of the receiver required for RS-485 systems! (See Figure E-5 below)

Appendix E RS-485 Network E-5

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Advantech ADAM 4000 user manual Appendix E Line Termination, Figure E-4Signal Distortion
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ADAM 4000 specifications

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