资料来源 : Free On-Line Dictionary of Computing

IEEE 488
     
         (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-Packard's
        implementation of IEEE 488.1.
     
        (1996-05-10)