ERT-A2 ALERT2 Configuration Manual
Revision 1.0
1
ERT-A2 Overview
Introduction
The ERT-A2 (ERTA2) battery powered wireless environmental monitoring unit is designed to provide
reliable monitoring of environmental measurements in critical applications such as flood warning
and other disaster management applications.
Input sensors to monitor environmental conditions such as rainfall, river heights, wind speed, wind
direction, air temperature, humidity can be connected directly to the ERTA2 unit which will sample
these inputs and on a detected change of value send over VHF/UHF radio, cellular or satellite
networks.
The ERTA2 is a compact and highly integrated unit which includes the capability to sample sensor
inputs, manage battery power consumption, power supplies, MPPT smart solar regulator and one or
two communication channels. All this functionality in enclosed in a weatherproof IP66 enclosure
which can easily be installed directly outdoors, in a flood warning tree (standpipe) or in another
enclosure with other monitoring equipment.
Communications protocol used in the ERTA2 is ALERT2 which is an international industry standard
for flood warning and disaster management applications. ALERT2 offers benefits of allowing very
large numbers of field sensors to be support, very high level of data transmission reliability with data
encoding and forward error correction, and flexible sensor data types/engineering units.
Cyber Security has been a strong consideration in the design of the ERTA2 unit. Features have been
incorporated into the ERTA2 to provide effective device security. ELPRO continues to provide
additional security features to the product as they become available in new additionas of the ALERT2
protocol
The ELPRO ERTA2 unit provides an extremely versatile and feature packed unit allowing standalone
installations with the addition of only sensor connections and possibly a battery charging source
such as solar panel.
Operation
The ERTA2 unit is designed with features to allow the minimum power consumption to maximise the
operational battery life.
In normal operation the ERTA2 will be switching between sleep and awake modes to allow it to
sample sensor and internal inputs to detect changes. If nothing has changed then it goes back to
sleep. If there is a change then it will wake fully to send the changes over the communications
channel.
To conserve the units power consumption the frequency of communications transmissions should
be kept to a minimum. Sensor digital and analog inputs have a sensitivity value that can be
configured that is the threshold of change before a communications transmission will be triggered.
There is also a configurable paralysis time which will limit the frequency of transmissions. This is
configured value in seconds to wait before transmitting again.
The ERTA2 includes a wide range of internal diagnostics and internal inputs that can be configured to
send as ALERT2 messages. Internal inputs include battery voltage, power supply/solar voltage,
received signal strength (RSSI), internal temperature and internal status bits.
Содержание ERRTS ALERT2
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