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Número de pieza | IEEE-488 | |
Descripción | Interface Bus | |
Fabricantes | ETC | |
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IEEE-488 INTERFACE BUS (HP-IB/GP-IB)
In the early 1970's, Hewlett-Packard came out with a standard bus (HP-IB) to help support their own laboratory
measurement equipment product lines, which later was adopted by the IEEE in 1975. This is known as the IEEE Std.
488-1975. The IEEE-488 Interface Bus (HP-IB) or general purpose interface bus (GP-IB) was developed to provide a
means for various instruments and devices to communicate with each other under the direction of one or more master
controllers. The HP-IB was originally intended to support a wide range of instruments and devices, from the very fast to
the very slow.
Description:
The HP-IB specification permits up to 15 devices to be connected together in any given setup, including the
controller if it is part of the system. A device may be capable of any other three types of functions: controller, listener, or
talker. A device on the bus may have only one of the three functions active at a given time. A controller directs which
devices will be talkers and listeners. The bus will allow multiple controllers, but only one may be active at a given time.
Each device on the bus should have a unique address in the range of 0-30. The maximum length of the bus network is
limited to 20 meters total transmission path length. It is recommended that the bus be loaded with at least one instrument
or device every 2 meter length of cable (4 meters is maximum). The use of GP-IB extenders may be used to exceed the
maximum permitted length of 20 meters.
Electrical Interface:
The GP-IB is a bus to which many similar modules can be directly connected, as is shown in Figure 1. A total of
16 wires are shown in the figure - eight data lines and eight control lines. The bus cables actually have 24 wires, providing
eight additional for shielding and grounds.
8 - wire data bus
Attention
Ready for data
Data accept
Data available
Serveice request
Interface clear
remote enable
End or Identify
Figure 1. IEEE-488 (HP-IB/GP-IB) Bus Configuration
9-5.1
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IEEE-488 | Interface Bus | ETC |
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