You can invoke a SetControlValue method of the Virtual Instrument class in order to set the values of the vi's controls/indicator. If you intend to mine data from the control/indicator then the GetControlValue method needs to be invoked. Below is the official prototype and explanations of each of these functions.
Name Type Description controlName string Name of the front panel control. value variant New value of the front panel control. This value can be numeric, Boolean, string, or array. A cluster in LabVIEW is represented as an array of variants in ActiveX. Return Value
Re turns the value of a front panel control.
Virtual Instrument object
Name Type Description controlName String Name of the front panel control. Return Value