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01/17/2019
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Page 33 of 47
3.2 RS422 Data transmission technology
With the RS422 transmission one line-pair is used for the signals Data+ and Data
–.
The serial data are transmitted without mass reference as a voltage difference
between two corresponding lines.
The receiver evaluates only the difference between the two lines. Therefore common-
mode interferences on the transmission line do not lead to a corruption of the useful
signal.
Under load RS422 transmitters provide output levels of ± 2 V between the two
outputs. RS422 receivers still recognize levels of ± 200 mV as valid signal.