Advantech WISE-1510, User Manual

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15 WISE-1510 User Manual
Chapter 2
H
/W Installation
Detail comparison as follow
Power Saving:
WISELink 2.0 Class A > WISELink 1.0 Class A > WISELink 1.0 Class C = WISELink
2.0 Class C
Wireless Coverage:
WISELink 1.0 Class C = WISELink 1.0 Class A > WISELink 2.0 Class C = WISELink
2.0 Class A
2.5.3 Data rate vs Distance
LoRa has many parameters. The one which the research is focusing on is the
Spreading Factor. The Spreading Factor is a set of parameters that specify transmit
power, subfrequency and air time. LoRa defines spreading factors numbered from 6
to 12. The lower is the spreading factor, the higher is the throughput, and the lower is
the distance covered. Also, lower spreading factor means lower power consumption.
At SF7, the distance is minimal, and the throughput is high. At SF12 (or SF11,
depending on bandwidth - at 125 kHz, SF11 and SF12 are swapped), the distance is
the max distance covered by LoRa standard, and the data rate is the lowest.
The spreading factor also changes the Air Time (or Time On Air). The Air Time is min-
imal at SF7. At each higher spreading factor, the value is nearly doubled.
Figure 2.8 Data rate and Distance
Spreading factors were assigned manually since the difference of LoRa regulation
between countries and countries.