NOVUS AUTOMATION
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REGISTER 16 – POWER LEVEL
According to the variations presented in the table below, the power level can be
adjusted as needed. The higher the power set, the greater the range and the
greater the consumption. It is suggested that the lowest value possible be
configured, if
RHT-Air
is not able to communicate with the
AirGate-Modbus
, it will
automatically increase the transmission power gradually, until it is able to
communicate with
AirGate-Modbus
or reach the highest configurable limit. It may
be that this register is configured with a value, and, after some time, this value
may be altered to adjust to a communicable power.
CODE
POWER LEVEL
0
0 dBm
1
2 dBm
2
4 dBm
3
6 dBm
4
8 dBm
5
10 dBm
6
12 dBm
7
14 dBm
REGISTER 27 – OPERATION CHANNEL
It indicates the operation channel in which the device is operating in the
network. It may vary from 11 to 25, in that every channel is equivalent to one
frequency of operation. The network will always operate on the channel with
less interference among all the 15 possible ones.
CHANNEL
OPERATION FREQUENCY
11
2405 MHz
12
2410 MHz
13
2415 MHz
14
2420 MHz
15
2425 MHz
16
2430 MHz
17
2435 MHz
18
2440 MHz
19
2445 MHz
20
2450 MHz
21
2455 MHz
22
2460 MHz
23
2465 MHz
24
2470 MHz
25
2475 MHz
REGISTER 28 –
LINK QUALITY INDICATOR
It serves to inform the quality of the reception link of the connection between the device and the
AirGate-Modbus
with which it is matched. This value is obtained by
measuring the power of the last package received. This power is measured in dBm, which is a logarithmic power unit in mW. The LQI may vary from -100 dBm (worst
reception quality) to -15 dBm (best reception quality).
For devices operating in ideal environments where there are no obstacles and no electromagnetic interference, the LQI will behave in a way close to the graph below,
where the comparison between different power levels is performed for the distance versus LQI ratio.
Figure 13 –
Distance x LQI relation for several powers
The table below lists the values obtained in the LQI reading with the evaluation
of signal quality. This information can be viewed more intuitively in the
DigiConfig
Diagnostics
tab.
REGISTER VALUE
QUALITY
ICON
0
USB-connected
device
-15 to -60
Great
-60 to -70
Very Good
-70 to -80
Good
-80 to -90
Regular
-90 to -100
Bad
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
.