Performs a USB control pipe transfer to the device.


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Inputs/Outputs

  • cu16.png index (0) —

    index passes a parameter to the device. The value you enter here depends on the value you entered in request.

    The index is often used in requests to specify an endpoint or an interface.
  • cu16.png value (0) —

    value passes a parameter to the device. The value you enter here depends on the value you enter in request.

  • cvsrn.png VISA resource name —

    VISA resource name specifies the resource to be opened. The VISA resource name control also specifies the session and class.

  • ci16.png request type —

    request type is the numeric representation of the request you want to send to the device.

    This parameter is a bitmapped field that identifies the characteristics of the specific request. The bit specifying the direction must be set to 0 (host-to-device).
  • ci16.png request —

    request specifies the particular request. The request you can enter depends on the value you entered in request type.

  • c1du8.png write buffer (empty) —

    write buffer contains the data to be written to the device.

  • cerrcodeclst.png error in (no error) —

    error in describes error conditions that occur before this node runs. This input provides standard error in functionality.

  • ivsrn.png VISA resource name out —

    VISA resource name out is a copy of the VISA resource name that VISA functions return.

  • ierrcodeclst.png error out —

    error out contains error information. This output provides standard error out functionality.

    • This function takes the values of the data payload in the setup stage of the control transfer as parameters. The function sends an optional data buffer write buffer if you require a data stage for this transfer.

    Note This function is only intended for users familiar with the USB protocol.