Advantech RS-485 Uživatelský manuál stáhnout pdf (Strana 319)

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101

ADAM-5000 C-7

Appendix C

Figure C-5 Signal distortion

The value of the resistor should be a close as possible to the charac-

teristic 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 kΩ

feeding into a diode transistor- resistor biasing network that is

equivalent to an 18 kΩ input resistor tied to a common mode voltage of

2.4 V. It is this configuration which provides the large common range of

the receiver required for RS-485 systems! (See Figure C-6 below).

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