|
IEEE-488 is a short-range digital communications 8-bit parallel multi-master interface bus specification. IEEE-488 was created as HP-IB (Hewlett-Packard Interface Bus) and is commonly called GPIB (General Purpose Interface Bus). It has been the subject of several standards. Although originally created in the late 1960s to connect together automated test equipment, it also had some success during the 1970s and 80s as a peripheral bus for early microcomputers, notably the Commodore PET. Newer standards have largely replaced IEEE-488 for computer use, but it still sees some use in the test equipment field. ==Origins== In the late 1960s, Hewlett-Packard (HP)〔This part of HP was later (c. 1999) spun off as Agilent Technologies, and in 2014 Agilent's test and measurement division was spun off as Keysight Technologies.〕 manufactured various automated test and measurement instruments, such as digital multimeters and logic analyzers. They developed the ''HP Interface Bus (HP-IB)'' to enable easier interconnection between instruments and controllers (computers and other instruments). The bus was relatively easy to implement using the technology at the time, using a simple parallel bus and several individual control lines. For example, the HP 59501 Power Supply Programmer and HP 59306A Relay Actuator were both relatively simple HP-IB peripherals implemented only in TTL, using no microprocessor. HP licensed the HP-IB patents for a nominal fee to other manufacturers. It became known as the General Purpose Interface Bus (GPIB), and became a de facto standard for automated and industrial instrument control. As GPIB became popular, it was formalized by various standards organizations. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「IEEE-488」の詳細全文を読む スポンサード リンク
|