The BDR320 had an SDI-12 interface, 2 differential (4 single-ended) analog input channels, 1 switched excitation output, 4 digital control outputs (one continuous), and 2 pulse count channels. Internal memory stored up to 30,000 data points. Data file format was NOT compatible with the CR500, CR10(X), 21X(L), or CR23X dataloggers.