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A digital communications bus originally developed by Hewlett Packard in the late 1960s, which is still widely used today for communicating with a wide range instrumentation. IEEE-488 is a parallel communications bus which uses a 24 wire connection consisting of 8 data lines, 3 handshaking lines, 5 bus management lines and 8 ground links. Although originally developed by Hewlett Packard under the name HPIB, other instrument manufacturers started to adopt the bus, naming it GPIB. In 1975 the IEEE-488 standard was published formalising the electrical and mechanical properties of the bus; this was followed in 1987 by IEEE-488.1 which added command formats to the standard.

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