
LI-7500 Communications: Wrong Serial Cable?
Most Eddy Covariance Flux Systems use the LI-7500 CO2/H2O Analyzer in conjunction with a Campbell Scientific Data Logger. The Campbell Data Logger communicates with a computer using a straight through type serial cable. This means pin 2 connects to pin 2, pin 4 to pin 4, etc. LI-COR, however, uses a combination of two serial cables for calibrating the LI-7500 CO2/H2O Analyzer, and for observing real-time values; a standard null modem cable (part no. 9975-016), and a second null modem…