Frequently Asked Questions (CI-340)

1. Where do I download the most current version of CI-340 software or firmware?
• The latest version of software, the driver, and firmware codes can be downloaded at www.cid-inc.com/ci-340-software.php. Use the serial number located on the underside of the instrument and whether the unit has an RS232 or USB connection to select the correct download.
2. What does it mean if net Photosynthesis (Pn) is negative?
• This indicates that the leaf you are sampling is not actively photosynthesizing or using CO₂. The plant could be photosynthesizing at low rates or be in a state of respiration.
3. What does it mean if the Leaf Temperature (Tleaf) is negative?
• If the Tleaf value is a large negative number (ex: -149 degrees Celcius), check that the temperature sensor is fully connected to the instrument. Often disconnecting the IR temperature sensor and then reconnecting it and powering the unit on again will correct the extreme negative reading. If the value does not change, try testing the sensor by holding it in your hand to warm it slightly and seeing if this increase is shown in the measurements.
4. When I download the CI-340 data transfer software, I get a LIBUSB.dll error or my computer is unable to find an appropriate driver?
• Go to http://sourceforge.net/projects/libusb-win32/ and download the libusb-win32 driver. Open the "Bin" folder. Run the "inf-wizard.exe." If prompted that the driver is not published, verified or signed, continue installing anyways. Once the inf-wizard is installed, run the CI-340 software. This .dll error occurs mainly on computers with 64 bit operating systems.

CID Bio-Science, Inc. is committed to providing customers with high quality, timely product support. If you need additional assistance, please contact our product support department:

Phone:	(360) 833-8835 ext. 306
Toll Free:	1-800-767-0119 ext. 306
Email:	support@cid-inc.com
Skype:	cidbiosciencesupport