IEC 62529:2012(E) provides the means to define and describe signals used in testing. It provides a set of common basic signal definitions, built upon formal mathematical specifications, so that signals can be combined to form complex signals usable across all test platforms. The standard provides support for structural textual languages and programming language interfaces for interoperability. This second edition cancels and replaces the first edition, published in 2007, and constitutes a technical revision.