Messenger

LabVIEW 2018 Help


Edition Date: March 2018
Part Number: 371361R-01
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Requires: Base Development System

Use the Messenger channel to transfer command-like messages among multiple writers and/or multiple readers. Messages can optionally be synchronous when the writer waits until the message is acknowledged by the reader. The Messenger channel is also capable of consolidating repetitive messages and disposing orphaned messages when the channel aborts.

EndpointDescription
ReadWaits to read an element from a Messenger channel.
Read AckWaits for an acknowledgement from a Messenger channel. If no acknowledgement from the channel, this endpoint waits until the acknowledgement is available.
Read Ack With AbortWaits for an acknowledgement from a Messenger channel or signals the channel to abort. This endpoint is the same as the Read Ack endpoint except that it has an abort input and an aborted? output. You can use the abort capability of the Messenger channel to close a channel abruptly, ignoring any data left in the channel buffer. You must use this endpoint together with the Write With Abort endpoint.
Read ScheduledReads an element from a Messenger channel at a scheduled time. The endpoint waits if no element is available in the channel at the scheduled time.
Read With AbortReads an element from a Messenger channel or signals the channel to abort. This endpoint is the same as the Read endpoint except that it has an abort input and an aborted? output. You can use the abort capability of the Messenger channel to close a channel abruptly, ignoring any data left in the channel buffer. You must use this endpoint together with the Write With Abort endpoint.
WriteWrites an element to a Messenger channel. The endpoint waits if the channel is full.
Write AckWrites an acknowledgement to a Messenger channel that the message with the given id has been read.
Write ScheduledWrites an element to a Messenger channel at a scheduled time. The endpoint waits until the scheduled time and continues waiting if the channel is full at the scheduled time.
Write With AbortWrites an element to a Messenger channel or signals the channel to abort. The endpoint waits if the channel is full. This endpoint is the same as the Write endpoint except that it has an abort input and an aborted? output. You can use the abort capability of the Messenger channel to close a channel abruptly, ignoring any data left in the channel buffer. You must use this endpoint together with the Read With Abort endpoint.

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