We are searching data for your request:
Upon completion, a link will appear to access the found materials.
Ever since digital instruments have been built, it has been necessary to connect them in order to process and exchange data between them. In the beginning, manufacturers designed instruments according to their own standards. Such instruments had interface structures with specialized control, signal and data lines. Logical levels, codes, formats, time restrictions and data rates were often inconsistent. Electrical parameters not only differed from one instrument manufacturer to the next, but often even between instruments from the same company. Therefore, engineers from numerous organizations searched for a solution to the interface problems posed by the variety of digital system designs.
As early as 1965, Hewlett Packard had the first draft for a three-wire handshake procedure for the control and data transmission of measuring devices with the designation HP-IB (Hewlett Packard Instrumentation BusHere, eight data lines and eight control and control lines are routed over a 25-pin cable. A maximum of 31 devices can be connected up to a length of 20 m. The transfer rate is typically 1.5 MB / s. Due to its great success and widespread use, this bus was included in the GPIB in 1973 (General Purpose Interface Bus)standardized. Two important standards for this type of bus were later adopted by the IEEE (Institute of Electrical and Electronics Engineers) adopted:
The current standard was published in 1978 and is IEEE 488.1-1978 (later referred to as IEEE 488.1 and renamed to IEEE 60488.1: 2004 in 2004). The IEC (International Electrotechnical Commission) adopted this standard as IEC-625. In 1987 the IEEE passed an amendment to IEEE 488.1, IEEE 488.2 (aka IEEE 60488.2: 2004), which merely expands, does not replace the original standard.
Faster variants of the IEEE 488.1 version are also known as HS488 (standardized as IEEE488.1-2003 in 2003). It must be noted, however, that older devices are often unable to process the HS488 protocol.