National Instruments NI-488.2 Benutzerhandbuch
Chapter 1
Introduction
1-2
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Controlling More Than One Interface
Figure 1-2 shows an example of a multiboard system configuration.
gpib0
is the access interface for the voltmeter, and
gpib1
is the access interface
for the plotter and printer. The control functions of the devices
automatically access their respective interfaces.
automatically access their respective interfaces.
Figure 1-2. Example of Multiboard System Configuration
Configuration Requirements
To achieve the high data transfer rate that the GPIB was designed for,
you must limit the number of devices on the bus and the physical distance
between devices. The following restrictions are typical:
you must limit the number of devices on the bus and the physical distance
between devices. The following restrictions are typical:
•
A maximum separation of 4 m between any two devices and an
average separation of 2 m over the entire bus.
average separation of 2 m over the entire bus.
•
A maximum total cable length of 20 m.
•
A maximum of 15 devices connected to each bus, with at least
two-thirds powered on.
two-thirds powered on.
One
GPIB
Another
GPIB
Digital
Voltometer
Plotter
Printer
gpib0
gpib1