TAILIEUCHUNG - 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. | 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 The GP-IB defines

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