System-Controller Mode - HP 8753E User Manual

System-Controller Mode

This mode allows the analyzer to control peripherals directly in a stand-alone environment
(without an external controller). This mode can only be selected manually from the
analyzer's front panel. It can only be used if no active computer or instrument controller is
connected to the system via HP-IB. If an attempt is made to set the network analyzer to the
system-controller mode when another controller is connected to the interface, the following
message is displayed on the analyzer's display screen:
"ANOTHER SYSTEM CONTROLLER ON HP-IB BUS"
The analyzer must be set to the system-controller mode in order to access peripherals from the
front panel. In this mode, the analyzer can directly control peripherals (plotters, printers, disk
drives, power meters, etc) and the analyzer may plot, print, store on disk or perform power
meter functions.
Note Do not attempt to use this mode for programming. HP recommends using an
external instrument controller when progr anuning. See the following section,
This is the mode that is normahy used for remote programming of the analyzer. In
talker/listener mode, the analyzer and all peripheral devices are controlled from an external
instrument controller. The controller can command the analyzer to talk and other devices
to listen. The analyzer and peripheral devices cannot talk directly to each other unless the
computer sets up a data path between them. This mode allows the analyzer to act as either
a talker or a listener, as required by the controlling computer for the particular operation in
progress
Pass-Control Mode
This mode allows the computer to control the analyzer via HP-IB (as with the talker/listener
mode), but also allows the analyzer to take control of the interface in order to plot, print, or
access a disk. During an analyzer-controlled peripheral operation, the host computer is free to
perform other internal tasks (i.e. data or display manipulation) while the analyzer is controlling
the bus. After the analyzer-controlled task is completed, the analyzer returns control to the
system controller.
In systems interfaced using HP-IB, each instrument on the bus is identified by an HP-IB
address. This address code must be different for each instrument on the bus These addresses
are stored in short-term, non-volatile memory and are not affected when you press m or
cycle the power. The analyzer occupies two HP-IB addresses: the instrument itself and the
display. The display address is derived from the instrument address by complementing the
instrument's least-significant bit. Hence, if the instrument is at an even address, the display
occupies the next higher address If the instrument is at an odd address, the display occupies
the next lower address.
The analyzer addresses are set by pressing (Locall ~~~~~~~~~~~~~. In system-controller mode,
the addresses must be set for the plotter, printer, disk drive, and power meter.
The default address for the analyzer is device 16, and the display address is device 17.
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Compatible Peripherals 1 l-21