No Card Data Acquisition Method Based on Labview

When using Labview for data acquisition and control,we usually need to use the NI company special data acquisition card,however,which is very expensive. And developing our own data acquisition card is very difficult to resolve compatibility issues with Labview. To resolve this problem,in this paper a Labview data acquisition system design based on the shared memory is proposed. The method enables the reading and writing process to use the same physical memory. And the shared Buffer queue length can be adjusted dynamically according to the specific circumstances of the communication between the current process;ultimately the most rapid transmission of data with minimal memory consumption is achieved. Experimental results show that the system has a maximum data acquisition rate of17.5MB/s,which meets the data acquisition system data requirements and reasonable use of resources. This method can replace a dedicated data acquisition card when acquisition rate is not very high demands.