VISA Read und Bytes at Port

VISA read liest immer höchstens die Anzahl an Bytes aus, die Du an Bytes at Port anschließt.

Hier der Auszug aus der LabVIEW-Hilfe:

VISA Read Details
This function might return less than the number of bytes requested if the function reaches the end of the buffer, reaches a termination character, or if a timeout occurs. The output error cluster indicates if a timeout has occurred.

Whether the data is read synchronously or asynchronously is platform-dependent. Right-click the node and select Synchronous I/O Mode»Synchronous from the shortcut menu to read data synchronously.

When you transfer data from or to a hardware driver synchronously, the calling thread is locked for the duration of the data transfer. Depending on the speed of the transfer, this can hinder other processes that require the calling thread. However, if an application requires that the data transfer as quickly as possible, performing the operation synchronously dedicates the calling thread exclusively to this operation.

Gruß Markus