American Magnetics 135 & 136 Liquid Helium Level Instruments (CE-Marked) - Manual (Page 55)

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Virtual Instrument Operation
IEEE-488 Virtual Instrument
5.2 IEEE-488 Virtual Instrument
The IEEE-488 (or GPIB) VI functions nearly identically to the RS-232 VI
with a few exceptions. The VI library, provided in the file
MODEL13X.LLB, for the IEEE-488 virtual instrument contains the
following files:
The Model 13X via GPIB.vi in the MODEL13X.LLB library should be used
if the Model 135/136 has exclusive control of the GPIB bus, i.e. is the only
device present and operating on the bus.
An additional library provided on the LabVIEW floppy disk,
COMP13X.LLB, contains all the VI’s included in the MODEL13X.LLB
library along with the additional Non-exclusive loop control.vi and
reusable version of the Model 13X via GPIB.vi. The Non-exclusive loop
control.vi provides a control example which can be customized to coexist
VI Function
13X Alarms.vi Manages alarm functions for 135/136.
Config 13X via GPIB.vi Initializes actual instrument from VI
configuration.
Convert from CM.vi Displays inches or percentage given input in cm.
Counter.vi Timer function for the virtual display.
Get 13X Level via GPIB.vi Updates virtual display with current level.
Init from 13X via GPIB.vi Initializes VI configuration from actual
instrument.
Model 13X via GPIB.vi The main VI containing the configuration and
front panel controls. This is the VI the user
should open and execute.
Non-exclusive loop control.vi This VI, which is only available in the
COMP13X.LLB library, should be modified and
executed for non-exclusive GPIB operation.
GPIB Send.vi Manages sending and receiving of ASCII strings
from the actual instrument.
Set 136 A via GPIB.vi Configures the A setpoint.
Set 136 B via GPIB.vi Configures the B setpoint.
Set 13X Interval via GPIB.vi Configures the sampling interval setting.
Set 13X HI via GPIB.vi Configures the HI setpoint.
Set 13X Length via GPIB.vi Configures the sensor length.
Set 13X LO via GPIB.vi Configures the LO setpoint.
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