Table Of Contents

Tristate Channels (G Dataflow)

Version:
    Last Modified: September 27, 2017

    Forces a channel into a high-impedance state. The effect is immediate; it does not require the session be committed.

    The channel remains tristated regardless of what other software commands are called. Call this node again and wire False to the tristate terminal to allow other software commands to control the channel normally.

    Channels stay tristated while the session remains open. Closing the session does not affect the high-impedance state of the channel, but future sessions can now control it.

    You must assign channels for static use with the Assign Static Channels node before sending those channels into a high-impedance state with this node, otherwise NI-HSDIO returns an error.

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    session in

    Instrument session obtained from the Initialize Acquisition Session node, the Initialize Generation Session node, or the Initialize External Calibration node.

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    channel list

    The tristated channels. Channels not specified in this list are unaffected.

    The following strings are examples of valid channel list syntax: 0-3, 5, 8-15 or 0, 3, 10. On supported devices, you can select the following clocks using these strings: STROBE and DDC_CLKOUT. On supported devices, you also can select all supported PFI channels using strings such as PFI1, PFI26, and so on. The clock and PFI strings are not case sensitive and can be grouped with the standard input strings separated by commas. The following are examples of valid string syntax: 0, 4, 6, PFI1, 7 or 0-12, STROBE, DDC_CLKOUT.

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    tristate

    A Boolean that specifies whether the channels specified in channel list remain tristated.

    True The channels specified in channel list remain tristated and ignore future software commands.
    False The channels specified in channel list become untristated by future software commands.
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    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

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    session out

    Handle that identifies the session in all subsequent node calls.

    The session out parameter is obtained from the Initialize Acquisition Session node or the Initialize Generation Session node.

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    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.

    Where This Node Can Run:

    Desktop OS: Windows

    FPGA: Not supported

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


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