meaning of iec

1. IEC International Electrotechnical Commission IEC 559 IEEE Floating Point Standard IEEE Institute of Electrical and Electronics Engineers IEEE 1076 The IEEE standard for VHDL. IEEE 1394 High Performance Serial Bus IEEE 488 standard> GPIB, General-Purpose Interface Bus, HP-IB, Hewlett-Packard Interface Bus An 8-bit parallel bus common on test equipment. The IEEE-488 standard was proposed by Hewlett-Packard in the late 1970s and has undergone a couple of revisions. HP documentation including data sheets and manuals calls it HP-IB, or Hewlett-Packard Interface Bus. It allows up to 15 intelligent devices to share a single bus, with the slowest device participating in the control and data transfer handshakes to drive the speed of the transaction. The maximum data rate is about one megabit per second. Other standards committees have adopted HP-IB American Standards Institute with ANSI Standard MC 1. 1 and International Electro-technical Commission with IEC Publication 625-1. To paraphrase from the HP 1989 Test & Measurement Catalog the 50th Anniversary version: The HP-IB has a party-line structure wherein all devices on the bus are connected in parallel. The 16 signal lines within the passive interconnecting HP-IB IEEE-488 cable are grouped into three clusters according to their functions Data Bus, Data Byte Transfer Control Bus, General Interface Management Bus. In June 1987 the IEEE approved a new standard for programmable instruments called IEEE Std. 488. 2-1987 Codes, Formats, Protocols, and Common Commands. It works with the IEEE Standard Digital Interface for Programmable Instrumentation, IEEE 488-1978 now 488. 1. HP-IB is Hewlett-Packards implementation of IEEE 488. 1.

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