This dataflow node connects asynchronous wires to dataflow wires. It accepts asynchronous data that it writes into a dataflow wire. The data type and data exchange policy are determined by the wire connected to the data in terminal.

Data in supplies the data to the asynchronous wire. Supported Data Exchange Policy: FIFO, circular buffer, register.

User-Enabled Terminals

This node has several terminals you can enable by selecting options from the node shortcut menu.

  • Enable specifies that the node only attempts a read of the asynchronous wire when the value of enable is TRUE.
  • Output valid returns the status of this read operation. This indicator is enabled when you read from a FIFO and the wait until read succeeds checkbox is not selected.

Read Accessor Node Details

When you drop the read accessor node on the LabVIEW block diagram, it has no associated data exchange policy. After you wire an asynchronous data wire to the read accessor node, it inherits the policy of that wire and displays the data exchange policy glyph in gray on the node.

Special Considerations for Single-Cycle Timed Loops

If you wish to use the FIFO data exchange policy inside a single-cycle timed loop, you must uncheck the wait until write succeeds checkbox.