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Advantages of GPIB | Disadvantages of GPIB

This page covers advantages and disadvantages of GPIB. It mentions GPIB advantages and GPIB disadvantages.

The GPIB IEEE-488 interface bus consists of 8 bit parallel lines. The GPIB connector has total 24 pins. It uses total 16 signal lines which consists of 8 data lines (bi-directional), 3 handshake lines, 5 for bus management. There are 8 more GND lines.

GPIB connector

The figure-1 depicts GPIB IEEE-488 connectors in plug and jack configurations. GPIB bus uses 5-bit address which provides total of 31 possible addresses to be used by equipments on GPIB interface. The IEEE standard allows about 15 devices to be shared on GPIB bus over 20 meters of length.

Advantages of GPIB

Following are the advantages of GPIB:
➨GPIB interface is simple.
➨GPIB interface port is widely available on all the test and measurement equipments.
➨The GPIB cable uses very rugged and robust connectors.
➨Using GPIB interface, single controller can monitor and control multiple T & M equipments or instruments. This is shown in the figure-2 in two different configurations viz. linear and star.

GPIB in linear and star connections

Disadvantages of GPIB

Following are the disadvantages of GPIB:
➨The GPIB connectors are bulky.
➨The interface carries low bandwidth data.
➨The GPIB interface is used for low speed data communication unlike modern interfaces which are used for high speed communication.
➨Modern instruments have slowly stopped its usage. It will become obsolete in few years.

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