GPIB
370B User Manual 4-9
Setup Data. Since most front panel settings are programmable, a series of
commands can set-up the 370B for a particular measurement. In fact, a group of
individual settings or an entire front panel setup can be strung together and sent
as a single message.
Queries can be used, in turn, to send individual settings or complete front panel
setups back to the controller. This means a setting can be made manually and
then stored using the bus controller, providing an alternative to storing the
setting in the mass storage of the 370B.
Measurement Data. Usually the most significant data available from the 370B are
sets of characteristic curves from devices being tested. For any given measure-
ment this data is packaged in two parts: a preamble and a curve. Preambles and
curves can be read from the 370B into the controller either separately or
combined. Later they can be loaded back into the 370B for further use.
The preamble contains the information needed for interpreting, scaling, and
labeling the numeric information in the curve. This preamble is coded in ASCII
characters and is readable by the operator without interpretation by the controller.
The curve is a series of binary-coded numbers expressing the X–Y coordinates of
the 1024 digitized points representing the displayed curves. These binary-coded
numbers are interpreted by the controller.
Two other types of data that can be read out of the 370B are: the coordinates of a
cursor located on the curves, and the text shown in the text–display area of the
screen.
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General