Data Acquisition can be divided into two broad classifications, real time data acquisition and data logging. Real time data acquisition is when data acquired from sensors is used either immediately or within a short period of time, such as when controlling a process. Data logging on the other hand is when data acquired from sensors is stored for later use. In reality, there is a continuum of devices between real time data acquisition and data logging that share the attributes of both of these classifications.

SCADATRON ST2000 can support both real time data acquisition and data logging over most of the available communication network. For data logging acquisition, no data shall be lost over the transmission network to Central Station due to intermittence in communication provided that Acknowledge (ACK) and Negative Acknowledge (NACK) is used. Windows based Data Logging Retriever Software can be obtained for installation in notebook to retrieve logged data from the RTU via RS232C serial port. Retrieved data is stored in Microsoft Access database (MDB) and also Comma Separated Variable (CSV) file. The data log trigger mechanism can be time base (from 1 second, 1 minute to 24 hours), state of change (any of 16-bits digital inputs) or rainfall tips/ pulse event triggered.

ST2000 has a integrated 128K non-volatile SRAM memory for continuos data logging up to 362 days based on 4 measurement parameters and hourly time base logging . It reduced to 90 days for data logging every 15 minutes. Logged data format is in DD/MM/YYYY HH:MM:SS, location id and 4 other measured value such as cumulative rainfall/totalised pulse, daily rain-fall/pulse intensity, 16 bits digital input status, sensor measured data in engineering values. It is possible for the retrieved logged data (in MDB or CSV) to be export to other format such as talida for analysis.

Logged Data can be retrieved via PSTN/GSM/Radio MODEM or directly via data retriever notebook carried to site

Optional graphical data presentation software is available to show data logging water level hydrograph and rainfall
bar chart after retrieved from individual RTU station or from different RTU stations