Non Return to Zero (NRZ) is a digital coding system used in RS-232 serial data links. This coding system is polarity sensitive. Non Return to Zero Inverse (NRZI) is a coding system which is insensitive to signal polarity. In this system, low signal levels mean no change in logical levels, and high signal levels represent a logic change from \''0\'' to \''1\'' or vice versa. The NRZI system is more immune to interference and is widely used in digital systems, like SDI.
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