Table Of Contents

XNET Convert (Signal to Frame » FlexRay) (G Dataflow)

Version:
    Last Modified: February 22, 2017

    Converts between NI-XNET signals and FlexRay frame data.

    connector_pane_image
    datatype_icon

    session in

    The session to read. This session is returned from XNET Create Session. The session mode must be Conversion.

    datatype_icon

    signal data

    An input that returns a one-dimensional array of signal values. Each signal value is scaled, 64-bit floating point. Each array element corresponds to a signal configured for the session. The order of signals in the array corresponds to the order in the session list.

    The data provides the value for the next conversion of each signal.

    datatype_icon

    error in

    Error conditions that occur before this node runs. The node responds to this input according to standard error behavior.

    Default: No error

    datatype_icon

    session out

    An output that is the same as session in, provided for use with subsequent nodes.

    datatype_icon

    unused payloads

    This parameter is empty. No user input is needed.

    datatype_icon

    frame data

    Returns the array of LabVIEW clusters. Each array element corresponds to a frame the session converted.

    The elements of each cluster are specific to the FlexRay protocol.

    datatype_icon

    Slot

    This element specifies the slot number within the FlexRay cycle.

    datatype_icon

    cycle count

    An element that specifies the cycle number. The FlexRay cycle count increments from 0 to 63, then rolls over back to 0.

    datatype_icon

    startup?

    A Boolean value that specifies whether the frame is a startup frame (true) or not (false).

    datatype_icon

    sync?

    A Boolean value that specifies whether the frame is a sync frame (true) or not (false).

    datatype_icon

    preamble?

    A Boolean value that specifies the value of the payload preamble indicator in the frame header. If the frame is in the static segment, preamble? being true indicates the presence of a network management vector at the beginning of the payload. The XNET Cluster FlexRay:Network Management Vector Length property specifies the number of bytes at the beginning.

    If the frame is in the dynamic segment, preamble? being true indicates the presence of a message ID at the beginning of the payload. The message ID is always 2 bytes in length.

    If preamble? is false, the payload does not contain a network management vector or a message ID.

    datatype_icon

    chA

    A Boolean value that specifies whether the frame was received on channel A (true) or not (false).

    datatype_icon

    chB

    A Boolean value that specifies whether the frame was received on channel B (true) or not (false).

    datatype_icon

    echo?

    A Boolean value that determines whether the frame was an echo of a successful transmit (true), or received from the network (false).

    datatype_icon

    type

    The frame type.The decimal value is in parentheses.

    FlexRay Data (32) FlexRay data frame. The frame contains payload data. This is the most commonly used frame type for FlexRay. All elements in the frame are applicable.
    datatype_icon

    timestamp

    An element that represents the absolute time when the XNET interface received the frame (end of frame), accurate to microseconds. The timestamp returned by the conversion is always invalid (0).

    datatype_icon

    payload

    The array of data bytes for FlexRay frames of type FlexRay Data or FlexRay Null. The array size indicates the received frame value payload length.

    According to the FlexRay protocol, this length range is 0-254.

    XNET Convert (Signal to Frame FlexRay) writes the FlexRay frame identification to the following fields:

    • slot
    • cycle count
    • chA/chB

    In addition, the following fields are set to their database definition:

    • startup?
    • sync?
    • preamble?
    datatype_icon

    error out

    Error information. The node produces this output according to standard error behavior.

    Where This Node Can Run:

    Desktop OS: Windows

    FPGA: Supported


    Recently Viewed Topics