Home Support NI Product Manuals NI-VISA 17.0 to 20.0 Manual

Table Of Contents

Clear (G Dataflow)

Download Manual | Offline Viewer Required
Version:
    Last Modified: September 27, 2017

    Clears the input and output buffers of the device.

    connector_pane_image
    datatype_icon

    session in

    The resource to be used.

    datatype_icon

    error in

    Error conditions that occur before this node runs.

    The node responds to this input according to standard error behavior.

    Standard Error Behavior

    Many nodes provide an error in input and an error out output so that the node can respond to and communicate errors that occur while code is running. The value of error in specifies whether an error occurred before the node runs. Most nodes respond to values of error in in a standard, predictable way.

    error in does not contain an error error in contains an error
    If no error occurred before the node runs, the node begins execution normally.

    If no error occurs while the node runs, it returns no error. If an error does occur while the node runs, it returns that error information as error out.

    		If an error occurred before the node runs, the node does not execute. Instead, it returns the error in value as error out.

    Default: No error

    datatype_icon

    session out

    The resource to which a VISA session is opened.

    This output also includes the class for the session, which matches that of session in.

    datatype_icon

    error out

    Error information.

    The node produces this output according to standard error behavior.

    Standard Error Behavior

    Many nodes provide an error in input and an error out output so that the node can respond to and communicate errors that occur while code is running. The value of error in specifies whether an error occurred before the node runs. Most nodes respond to values of error in in a standard, predictable way.

    error in does not contain an error error in contains an error
    If no error occurred before the node runs, the node begins execution normally.

    If no error occurs while the node runs, it returns no error. If an error does occur while the node runs, it returns that error information as error out.

    		If an error occurred before the node runs, the node does not execute. Instead, it returns the error in value as error out.

    Commands for 488.2 Instruments (GPIB, VXI, TCP/IP, USB)

    • GPIB—VISA sends the Selected Device Clear command.
    • VXI—VISA sends the Word Serial Clear command.
    • USB—VISA sends the INITIATE_CLEAR and CHECK_CLEAR_STATUS commands on the control pipe.

    Commands for Non-488.2 Instruments (Serial Instr, TCP/IP Socket, USB Raw)

    • Serial Instr—VISA flushes (discards) the I/O output buffer, sends a break, and then flushes the I/O input buffer.
    • TCP/IP Socket—VISA flushes the I/O buffers.
    • USB Raw—VISA resets the endpoints referred to by the USB Settings:Bulk-In Pipe and USB Settings:Out Pipe properties.

    Where This Node Can Run:

    Desktop OS: Windows

    FPGA: Not supported

    Web Server: Not supported in VIs that run in a web application

    Recently Viewed Topics