American Magnetics 185 & 186 Liquid Level Instruments (CE-Marked) - Manual (Page 66)

56 Rev. 3
Virtual Instrument Operation
IEEE-488 Virtual Instrument
with multiple devices on one GPIB bus. The exact design of the non-
exclusive operation is dependent upon the specific devices you may have
connected to the bus.
When running a VI it is important to operate the instrument using
the VI and not via the actual instrument front panel.
Otherwise, the
VI and the actual instrument may not be synchronized. The only
exceptions to this rule are calibration procedures or operation of the fill
toggle switch if manual override becomes necessary, both of which are
functions that are not available from the VI. Any function available from
the VI should be normally be set by using the VI and not the front panel of
the instrument.
6.2.1 Launching and initializing the GPIB VI
First, make sure the Model 185/186 is connected to the GPIB bus and that
the unit is powered on. Independent of whether you use the exclusive or
non-exclusive mode of execution, the initialization method of the Model
185/186 should be determined. To set the initialization method, scroll to
the area above the virtual front panel and observe the virtual controls as
illustrated below (the version of the Model 18X via GPIB.vi provided in
COMP18X.LLB provides inputs for the initialization method and input/
output for the configuration). The Initialize State from Instrument? switch
allows the user to select whether the instrument is initialized from the
current settings of the actual instrument or from the controls available
from the VI. If the Yes option is selected, the VI will initialize all settings
from the actual instrument. If the No option is selected, the user should
enter all data in the control fields (Sensor Length, Hi Setpoint, etc.) in the
indicated units. The user should also select the correct GPIB bus and