Specifications

Chapter 1 - Overview RS-422 And RS-485 Applications Ebook
Page 11 of 137 Manual Documentation Number: <DocNumber>
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Balanced Data Transmission
In a balanced data transmission system the voltage produced by the
driver appears across a pair of signal lines. These lines produce
complementary (opposite) output signals. When one is low, the other is
high, and vice versa. It is important to understand that RS-422/RS-485
balanced data transmission also requires a GND connection, even
though the GND connection is not used by the receiver to determine
the logic state of the data.
Figure 4: RS-422/RS-485 Balanced Data Transmission