1 Introduction
The DataSlave is a standalone unit which takes automated sensor measurements from
industrial Modbus or SDl-12 sensors. The data can be stored internally in non-volatile
memory and/or transmitted wirelessly to a receiver unit. Typically data is received by a
Van Walt DataHub. a Mandar Gateway, or a Mandar USB Config Tool
Figure 1 shows the unit with a pair of AA sized batteries for size comparison.
Figure 1 DataS!ave
The enclosure is made from a solid diecast metal and rated to IP67. A Gore valve, along
with up to two environmentally sealed cable glands are fitted to allow vented sensors to
be safely used. The antenna is a sealed tamperproof design. bolted on from inside the
enclosure. Its length allows a greater wireless range than other typical low profile
tamperproof aerials. Two AA sized LR91 batteries and its low power design can keep the
unit running for 18 months'. If the application has a more demanding power budget, then
an external 12V supply can be connected to power the sensors.
A DataSlave needs configuration so that it knows how to retrieve data from sensors and
what to do with the data. The configuration is done wirelessly using a USB configuration
1
Based on a single sensor taking measurements every 15 minutes.
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