Rs422 Data Transmission Technology - TR-Electronic 582 Serie Benutzerhandbuch

4.2 RS422 Data transmission technology

With the RS422 transmission one line-pair is used for the signals Data+ and Data–
and one line-pair for the signals Clock+ and Clock–.
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.
By the use of shielded and twisted pair cable, data transmissions over distances from
up to 500 meters with a frequency of 100 kHz can be realized.
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.
Printed in the Federal Republic of Germany
05/04/2018 TR - ECE - BA - DGB - 0141 - 00
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