Ieee-488 Bus Connections; Figure 5-1 Ieee-488 Connector; Figure 5-2 Ieee-488 Connections - Keithley 7001 Instruction Manual

IEEE-488 Reference
those commands should be in and the format for values re-
turned by the instruments.
5.2

IEEE-488 bus connections

The Model 7001 can be connected to the IEEE-488 bus
through a cable equipped with standard IEEE-488 connec-
tors, an example is shown in Figure 5-1. The connector can
be stacked to allow a number parallel connections to one in-
strument. Two screws are located on each connector to en-
sure 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 types of connectors
on the instrument, which is designed for metric threads.
Figure 5-1
IEEE-488 connector
A typical connecting scheme for a multi-unit test system is
shown in Figure 5-2. Although any number of connectors
could theoretically be stacked on one instrument, it is recom-
mended that you stack no more than three connectors on any
one unit to avoid possible mechanical damage.
NOTE
In order to minimize interference caused
by electromagnetic radiation, it is recom-
mended that only shielded IEEE-488 ca-
bles be used. The Models 7007-1 and
7007-2 shielded IEEE-488 cables are
available from Keithley.
5-2
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Instrument Instrument
Figure 5-2
IEEE-488 connections
Connect the Model 7001 to the IEEE-488 bus as follows:
1. Line up the cable connector with the connector located
on the rear panel. The connector is designed so that it
will fit only one way. Figure 5-3 shows the location of
the IEEE-488 connector on the instrument.
2. Tighten the screws securely, but do not overtighten
them.
3. Add additional connectors from other instruments, as
required.
4. Make certain that the other end of the cable is properly
connected to the controller. Most controllers are
equipped with an IEEE-488 style connector, but a few
may require a different type of connecting cable. Con-
sult the instruction manual for your controller for the
proper connecting method.
NOTE
The IEEE-488 bus is limited to a maxi-
mum of 15 devices, including the control-
ler. The maximum cable length is 20-
meters, or two meters times the number of
devices, whichever is less. Failure to ob-
serve these limits may result in erratic bus
operation.
Instrument
Controller