What is the IEEE 488 bus system?
What is the IEEE 488 bus system?
Bus Lines The IEEE-488 bus is a multidrop interface in which all connected devices have access to the bus lines. The 24 bus lines group into four categories: Data Lines – Eight lines (DIO1 through DIO8) used to transfer information (data and commands) between devices on the bus, one byte at a time.
What is meant by GPIB and handshaking?
GPIB employs a bus interface, and piggyback connectors make connecting and configuring devices easy. It is possible to use a single PC interface even if more devices are connected to the system in the future. Handshake communication ensures highly reliable data transfer.
How does GPIB bus work?
GPIB uses eight data lines to transfer 1 byte of data at a time at a speed of up to 1 MB/s. However, many measuring instruments have a slow communication speed, and the communication speed of devices connected on the same bus will be limited to that of the slowest device.
How old is GPIB?
History of GPIB General Purpose Interface Bus, or GPIB has been formally standardized since 1975 by the Institute of Electrical and Electronics Engineers (IEEE), at which point they assigned it the standard IEEE number 488 (later IEEE 488.1 and IEEE 488.2).
What is the IEEE 488 or GPIB connector?
This provides an ideal physical interface for the standard. The IEEE 488 or GPIB connector is very similar in format to those that were used for parallel printer ports on PCs although the type used for the GPIB has the advantage it has been changed so that several connectors can be piggy-backed.
How many clarifications have been made in IEEE Std 488?
Three of the clauses in which changes and clarifications have been made in IEEE Std 488.1 are attributable directly to the needs of IEEE Std 488.2.
What is the IEEE 488 standard for instrument control?
While IEEE 488.1 defined the hardware and IEEE 488.2 defined the protocol, there was still no standard for instrument-specific commands. Commands to control the same class of instrument, e.g., multimeters, would vary between manufacturers and even models.
What are the characteristics of IEEE 488 bus?
Characteristics. IEEE 488 is an 8-bit, electrically parallel bus. The bus employs sixteen signal lines — eight used for bi-directional data transfer, three for handshake, and five for bus management — plus eight ground return lines. Every device on the bus has a unique 5-bit primary address, in the range from 0 to 30…
