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Operating Concepts
GPIB Operation
GPIB STATUS Indicators
When the analyzer is connected to other instruments over GPIB, the GPIB STATUS indicators in the
instrument state function block light up to display the current status of the analyzer.
R = remote operation
L = listen mode
T = talk mode
S = service request (SRQ) asserted by the analyzer
System Controller Mode
The softkey activates the system controller mode. When in this mode, the
analyzer can use GPIB to control compatible peripherals, without the use of an external computer. It can
output measurement results directly to a compatible printer or plotter, store instrument states using a
compatible disk drive, or control a power meter for performing service routines. The power meter calibration
function requires system controller or pass control mode.
Talker/Listener Mode
The softkey activates the talker/listener mode, which is the mode of operation
most often used. In this mode, a computer controller communicates with the analyzer and other compatible
peripherals over the bus. The computer sends commands or instructions to and receives data from the
analyzer. All of the capabilities available from the analyzer front panel can be used in this remote operation
mode, except for control of the power line switch and some internal tests.
Pass Control Mode
The softkey activates the third mode of GPIB operation: the pass control mode.
In an automated system with a computer controller, the controller can pass control of the bus to the analyzer
on request from the analyzer. The analyzer is then the controller of the peripherals, and can direct them to
plot, print, or store without going through the computer. When the peripheral operation is complete, control
is passed back to the computer. Only one controller can be active at a time. The computer remains the
system controller, and can regain control at any time.
Preset does not affect the selected controller mode, but cycling the power returns the analyzer to
talker/listener mode.
Information on compatible peripherals is provided in the “Options and Accessories” chapter of the reference
guide.
Address Menu
This menu can be accessed by pressing the softkey within the GPIB menu.
In communications through the General Purpose Interface Bus (GPIB), each instrument on the bus is
identified by a GPIB address. This decimal-based address code must be different for each instrument on the
bus.
This menu lets you set the GPIB address of the analyzer, and enter the addresses of peripheral devices so
that the analyzer can communicate with them.
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