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To read the raw data, we need to user Hyper Terminal, a Windows program that can bee accessed under Windows>Accessories>Communication. The HyperTerminal manual should be read to figure out exact settings/configurations to read from Modbus. Next, we have to buy the Modbus program package (or this might come free with HF Scientific software).

Monroe's comments: This is all digital data. We want analog data. We want voltage, not serial communication using MODBUS. We are already using the modbus (not sure on this terminology, but we are definitely using RS485 communication protocol) to get the data from the instrument. And I think we are already getting a data point every second. The process controller software uses serial communication (in a more sophisticated way than the hyperterminal approach) to get data from the turbidimeter. If we can get an analog signal then the meaningful data rate will only be limited by the detector (sensor) response characteristics. Check out: Floc Strength Measurement