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5-1
Chapter 5
Operating the Meter Using the Computer
Interface
Introduction
The meter can be operated from a host (e.g., a terminal, controller, PC, or computer) by
sending commands to it through a computer interface on the rear panel.
Chapter 5 describes how to set up, configure, and operate the meter via the RS-232 or
(optional) IEEE-488 computer interface. With the (optional) IEEE-488 computer
interface installed, the meter is fully programmable for use on the IEEE Standard 488.1
interface bus (1987). The meter is also designed in compliance with supplemental
standard IEEE-488.2 (1987).
This chapter assumes you are familiar with the basics of data communication, the RS-232
interface, and the IEEE-488 bus. For an introduction to the IEEE-488 interface, request
Fluke Application Bulletin AB-36, "IEEE Standard 488-1978 Digital Interface for
Programmable Instrumentation."
An annotated sample program, illustrating the use of the RS-232 computer interface, is
provided at the end of Chapter 5. Refer to Chapter 3 for complete descriptions of all
meter functions and features. Remote calibration procedures are provided in the Fluke 45
Dual Display Multimeter Service Manual (P/N 856042).
Local and Remote Operations
When the meter is operated from a host, it is said to be operated "remotely." When the
meter is operated from its front panel, it is said to be operated "locally."
Most operations that can be performed locally can also be performed remotely, over the
computer interface. Some operations, like setting communications parameters for the
RS-232 interface and addressing the meter for IEEE-488 operations, can only be
performed from the front panel.
Computer Interfaces
The meter comes equipped with an RS-232 (serial) interface. The IEEE-488 interface is
optional and is contained on a single printed circuit assembly (pca). Only one computer
interface can be enabled at a time. Using either interface turns the meter into a fully pro-
grammable instrument that can be integrated into an automated instrumentation system.
If you are using the RS-232 interface, continue reading. If you are using the IEEE-488
interface, skip to "Preparing Meter for Operations via IEEE-488 Interface" later in
Chapter 5.