There is a problem with some high-speed USB connections on computers running Windows 7. This is a problem especially with laptop computers. The symptom of this problem is that your LabVIEW VI, or the Analog Express VI, will read from an analog sensor for a few seconds and then lose communication with the sensor. Unplugging and then reinserting the USB cable into the computer will fix communication with the sensor, but again, for only a few seconds.<\/p>\n
Depending on what example you are running you may, or may not see error (-200474).<\/p>\n
The fix:
\nFirst, check the installed version of DAQmx software. If it is not 9.4 or higher, download the latest version from the National Instruments web site (www.ni.com) and install it.<\/p>\n
Then, get the latest version of the Vernier LabVIEW files for SensorDAQ. You can download the LabVIEW files from here: https:\/\/www.vernier.com\/engineering\/ni-labview\/downloads\/sdaq\/<\/a><\/p>\n If you are using an old version of our LabVIEW files for SensorDAQ and do not update to the latest version you will need to manually replace a file, following these instructions:<\/p>\n Download the VI called SensorDAQ_ConfigAITask.vi which is attached. Copy this to the Vernier files in the LabVIEW directory to replace the old SensorDAQ_ConfigAITask.vi. Find this file in the LabVIEW directory at
\nC:\\Program Files\\National Instruments\\LabVIEW 20XX\\vi.lib\\Vernier\\SensorDAQ\\Low Level Drivers\\SensorDAQ subVIs.
\nIf it is a 64-bit computer, the LabVIEW directory will be found in Program Files (x86).<\/p>\n