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5. Overview
LOGBOX SD is designed for measuring, processing, recording (data logging) of
measured data in real time for the needs of meteorology and slow signals analyses. It
employs eight analog inputs, which can be configured by software as unipolar inputs
with 12 bits resolution or as unipolar/bipolar differential inputs with 24 bit
resolution. With definition of polynomial coefficients (of the 3-rd order) measured
values are converted to engineering units. Four digital inputs are configurable by
software for measuring frequency, time (logical level) or as counters. Again, with
definition of polynomial coefficients (of the 3-rd order) the measured values are
converted to engineering units. For data logging 128kB of memory is available. This
EEPROM type memory will keep data even after total disconnection of the battery.
Additionally, user can insert the SD memory card for long time data storage.
Hardware and software support for temperature sensors like PT100 and thermistor
are provided.
For communication the LOGBOX SD uses either RS232 or RS485 communication port.
Selection is made by the jumper on the board. Supported communication speeds are
in the range from 300bps up to 115200bps.
The Real Time Clock circuit keep track of time and date. There is lithium battery of
standard size and with ultra low power design. Operational life is more than 10000
hours.
For signalling and switching external devices the LOGBOX SD has built-in relay ports
capable to handle currents up to 300mA and voltages up to 60Vdc
Additionally a reference voltage of 2.5Vdc is available.
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