NOTE: The model described in the graphic takes in consideration the
propagation channel only. LQI may vary due to several factors, such as due
to peripheral obstacles like trees, buildings and hills that interfere in the
propagation channels as explained by the Fresnel Zone phenomenon.
REGISTER 29 – BATTERY POWER
It has the value of measuring the voltage level of the battery in engineering
unit. The decimal point is fixed in three houses. The value is without the
point and must be predicted by the reading software. Reading the battery
voltage may show an error of up to 5 %.
Typically, a battery with 100 % of its load has voltage above 3.6V.
Depending on the use of RHT-Air, the battery will gradually decrease
voltage. It is recommended to periodically check the value of this register so
that, when it reaches values below 3.3 V, a battery change is scheduled.
Checking the battery capacity can be done using the Diagnostics tab of the
DigiConfig software, which will display an icon. The evaluation of battery
capacity can be performed according to the criteria presented in the table
below:
REGISTER VALUE BATTERY
CAPACITY ICON
0 USB-connected
device.
3500 to 3700 Great
NOTE 1: Even when the power is below 100 %, the device will operate
normally.
NOTE 2: The gradual failure of the battery’s power is not linear, therefore,
though the device is able to continue working under tensions below 3.0 V,
when it reaches this level, there is little left for its life, since the power will fail
more quickly.
NOTE 3: While the device is being powered from an external source, you may
notice a slight rise in battery voltage. This is because the battery voltage
increases whenever power from the same battery is not being consumed.
NOTE 4: The machine’s operating temperature has a significant impact on
the battery’s capacity. Temperatures below 0 °C will typically shorten the
battery’s life.
NOTE 5: Battery chemistry is directly affected by the ambient temperature.
High temperatures tend to raise battery voltage, as low temperatures tend to
decrease battery voltage. In both cases, autonomy is negatively affected.
NOTE 6: The update time, as well as the operating power, have a significant
impact on the battery’s capacity. If the device is configured for the lowest
update interval, the battery will typically last less. The same happens when
the device is far from the AirGate-Modbus with which it should be matched,
needing a higher transmission power to operate.
NOTE 7: Remove the battery or insert the insulation film when the device is
not in use. Leaving the powered device out of range of a Wireless network
will cause the device to continually attempt to pair, which may lead to
premature battery death.
REGISTER 30 – LAST POLL’S DURATION
Every time the RHT-Air publishes something on AirGate-Modbus, this
register gets a zero value. Every 100 ms, this register is increased in 1 unit
in order to indicate how long it has been since the last publication.
REGISTER 31 – MODBUS ADDRESS
It sets the address of the device on the Modbus network. This address
identifies the device on the Modbus network. Its configuration may range
from 1 and 247. There cannot be more than one piece of device with the
same address on the same network. RHT-Air is originally manufactured with
the address 246. When connected to a USB interface, it always responds to
Modbus functions through the address 246. When it is in operation, it always
responds through the address it was configured for in this register according
to the communication parameters of the Modbus network on which it was
installed.
REGISTER 32 – UPDATE TIME
It sets the configuration for how often the device wakes to publish
information on the AirGate-Modbus with which it is matched and update the
IHM screen.
The shorter the update time, the more recent the data available to the
master of the Modbus network will be, but the higher the energy
consumption spent and the battery's life will be proportionately shorter. On
the other hand, the higher the update time set, the lower the energy
consumption spent will be, thus providing a longer life for the battery.
REGISTER 33 – INDICATION MODE
It sets the mode of indication of the values read on the display. The device is
originally manufactured with the indication of temperature and relative
humidity.
