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Appendix D Piezo Control Method Summary
The 'Piezo' ActiveX Control provides the functionality required for a client application
to control one or more of the APT series of piezo controller units. This range of
controllers covers both open and closed loop piezo control in a variety of formats
including compact Cube type controllers, benchtop units and 19" rack based modular
drivers.
To specify the particular controller being addressed, every unit is factory programmed
with a unique 8-digit serial number. This serial number is key to the operation of the
APT Server software and is used by the Server to enumerate and communicate
independently with multiple hardware units connected on the same USB bus. The
serial number must be specified using the HWSerialNum property before an ActiveX
control instance can communicate with the hardware unit. This can be done at design
time or at run time. Note that the appearance of the ActiveX Control GUI (graphical
user interface) will change to the required format when the serial number has been
entered.
The Methods and Properties of the Piezo ActiveX Control can be used to perform
activities such as selecting output voltages, reading the strain gauge position
feedback, operating open and closed loop modes and enabling force sensing mode.
A brief summary of the methods and propertys applicable to the PPC001 unit is given
below, for more detailed information and individual parameter descriptiond please see
the on-line help file supplied with the APT server.
Methods
DeleteParamSet
Deletes stored settings for specific controller.
DisableHWChannel
Disables the drive output.
DoEvents
Allows client application to process other activity.
EnableEventDlg
Enables or disables the event dialog box.
EnableHWChannel
Enables the drive output.
GetControlMode
Gets the loop operating mode (open/closed).
GetForceSenseParams
Gets the force sensing mode parameters.
GetJogStepSize
Gets the jogging step size.
GetMaxTravel
Gets the maximum travel of a strain gauge equipped
piezo actuator
GetMaxOPVoltage
Gets the value for the maximum output in the range
0 to 150 V.
GetOutputLUTParams
Gets the output voltage waveform (LUT) operating
parameters.