In talker/listener mode, the analyzer behaves as a simple device on the
bus. While in this mode, the analyzer can make a plot or print using
the
OI~TF'PLI~IT;
or
OI_ITPF'RIt4;
commands. The analyzer will wait
until it is addressed to talk by the system controller and then dump the
display to a plotter/printer that the system controller has addressed to
listen. Use of the commands PLiST; and
FR
I
NHLL;
require control to
be passed to another controller.
In pass-control mode, the analyzer can request control from the system
controller and take control of the bus if the controller addresses it
to take control. This allows the analyzer to take control of printers,
plotters, and disk drives on an as-needed basis. The analyzer sets
event-status register bit 1 when it needs control of the interface, and
the analyzer will transfer control back to the system controller at the
completion of the operation. It will pass control back to its controller
address, specified by ADDRCONT.
The analyzer can also operate in the system-controller mode. This mode
is only used when there is no remote controller on the bus. In this
mode, the analyzer takes control of the bus, and uses it whenever it
needs to access a peripheral. While the analyzer is in this mode, no
other devices on the bus can attempt to take control. Specifically, the
REN, ATN, and
IF’C
lines must remain unasserted, and the data lines
must be freed by all but the addressed talker.
1-24 HP-IB
Pro@mum
‘ng and Command Reference Guide
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