The RSTAR Array Radio Series (RSTAR) uses wireless technology to provide continuous data acquisition from RST field instruments to RST data loggers. The RSTAR Nodes use the same star topology at the sensor level as a continuously active RTU Hub. The individual Nodes are accessed via ModBus RTU commands from an RTU Hub interfaced with a FlexDAQ data logger. The RTU Hub is based on 900 MHz-, 868 MHz-, and 2.4 GHz-spread spectrum bands (the spectrum band used depends on the country in which it is deployed), with an extensive open-country range through use of a simple dipole antenna. A complete RSTAR system is packet-oriented and consists of RSTAR Nodes (slaves) and an RTU Hub (master). The RSTAR Nodes wake from low-power sleep to collect data from their attached sensors, such as RST’s Vibrating Wire Piezometers. This data, which includes the module address, hub address, sensor module serial number, diagnostics, data, and CRC check, is then sent wirelessly as a packet to the RTU Hub. Upon receipt by the FlexDAQ, the RTU Hub will issue an ACK signal which may include clock synchronization and rate data. The RTU Hub stores the data in a temporary register set that is overwritten as new data is received; there is an intermediate data logging function in the RSTAR Node. The data logger within the FlexDAQ has the ultimate responsibility for logging data.

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