SECTION
4
IEEE-488 Programming
4.1 INTRODUCTION
The IEEE-488 bus is an instrumentation data bus with
hardware and programming standards originally adopted
by the IEEE (Institute of Electrical and Elearonic Engineers)
in 1975 and given the IEEE-488 designation. In 1978, stan-
dards were upgraded into the IEEE-488~1978 standards. The
Model 263 conforms to these standards.
4.2 BUS CONNECTIONS
The following paragraphs provide the detailed informa-
tion needed to connect instrumentation to the IEEE-488
bus.
4.2.1 Typical Controlled Systems
System configurations are as varied as their applications.
To obtain as much versatility as possible, the IEEE-488 bus
was designed so that additional instrumentation could be
easily added. Because of this versatility, system complexity
can range from the very simple to extremely complex.
Figure 4-l shows two possible system configurations.
Figure 4-1(A) shows the simplest possible controlled
system. The controller is used to send commands to the
instrument, which sends data back to the controller.
The system in Figure 4-1(B) is somewhat more complex in
(A) SIMPLE SYSTEM
coNrRcuER INSTRUMENT
MODEL 263
INSTRUMENT
(B) ADDITIONAL INSTRUMENTATION
Figure 4-1. System Types
4-l
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