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Chapter 3, Operating Overview
Passing Instrument Control
The Test Set has bus control capability (Active/Non-Active Controller).
Additionally the Test Set can be also be configured as the System Controller. By
definition then, the Test Set has the capability to demand control, pass control,
accept control, and request control of the bus depending upon its configuration, its
current operating mode, and the system configuration. Many possibilities for
passing control among several controllers on the same bus exist. Attempting to
identify all the possible techniques of passing control in such a system is beyond
the scope of this document (refer to the IEEE 488.1 and 488.2 Standards for
additional information).
Configuring the Test Set as the System Controller
To configure the Test Set as a System Controller, select the I/O CONFIGURE
screen, position the cursor to the
highlight the
Choices
Controller it will also become the Active Controller. The letter C appears in the
upper-right corner of the display to indicate that the Test Set is now the Active
Controller.
If the Test Set is the only controller on the bus it must be configured as the System
Controller. If the Test Set is not the only controller on the bus, then whether or not
it is configured as the System Controller would depend upon three issues:
1.
2.
3.
Ensure that only one Controller connected to the bus is configured as the System
Controller or bus conflicts will occur.
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field by pushing the Rotary Knob, select
Mode
menu. As a consequence of setting the Test Set to be the System
whether or not other controllers have System Controller capability
which controller will be the Active Controller upon power-up
which Controller will be monitoring the bus to determine if communications
have failed (only the System Controller can unconditionally demand control of
the bus and reset it to a known state using the IFC line)
field using the Cursor Control knob,
Mode
from the
Control
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