3
IEEE-488 Reference
3-1
3.1 Introduction
This section contains reference information on programming
the Model 2002 over the IEEE-488 bus and is organized as
follows:
3.2 IEEE-488 bus connections:
Explains instrument con-
nections to the IEEE-488 bus.
3.3 Primary address selection:
Explains how to set the
primary address from the front panel.
3.4 QuickBASIC 4.5 programming:
Summarizes pro-
gramming using QuickBASIC 4.5 with the KPC-
488.2 interface and Universal Language Driver
(CECHP).
3.5 General bus commands:
Covers the general IEEE-
488 commands required for basic operations, such as
placing the unit in remote.
3.6 Front panel aspects of IEEE-488 operation:
Covers
status indicators, messages that pertain to bus opera-
tion, and the use of the LOCAL key.
3.7 Status structure:
Explains the various registers and
queues that make up the status structure of the Model
2002.
3.8 Trigger model:
Explains the operation process (Trig-
ger Model) over the IEEE-488 bus.
3.9 Program message syntax:
Covers the syntax rules for
common commands and SCPI commands.
3.10 Common commands:
Covers the IEEE-488.2 com-
mon commands used by the Model 2002.
3.11 SCPI Signal Oriented Measurement Commands:
Covers the signal oriented commands used by the
Model 2002.
3.12–3.24 SCPI command subsystems:
Covers the SCPI
commands used by the Model 2002.
The IEEE-488 is an instrumentation data bus with hardware
and programming standards originally adopted by the IEEE
(Institute of Electrical and Electronic Engineers) in 1975 and
given the IEEE-488 designation. In 1978 and 1987, the
standards were upgraded to IEEE-488-1978 and IEEE-
488.1-1987, respectively. The Model 2002 conforms to these
standards.
The Model 2002 also conforms to the IEEE-488.2-1987
standard and the SCPI 1991 (Standard Commands for Pro-
grammable Instruments) standard. IEEE-488.2 defines a
syntax for sending data to and from instruments, how an
instrument interprets this data, what registers should exist to
record the state of the instrument, and a group of common
commands. The SCPI standard defines a command language
protocol. It goes one step farther than IEEE-488.2 and
defines a standard set of commands to control every pro-
grammable aspect of an instrument.
3.2 IEEE-488 bus connections
The Model 2002 can be connected to the IEEE-488 bus
through a cable equipped with standard IEEE-488 connec-
tors, an example is shown in Figure 3-1. The connector can
be stacked to allow a number of parallel connections to one
instrument. Two screws are located on each connector to
ensure that connections remain secure. Current standards
call for metric threads, which are identified with dark colored
screws. Earlier versions had different screws, which were sil-
ver colored. Do not attempt to use these type of connectors
on the instrument, which is designed for metric threads.
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