CMi416
0 User’s Manual English
CMi416
0 User’s Manual English
page | 13 (28)
[2020-10]
V1.3
6.5 Adaptive data rate (ADR)
CMi4160 supports Adaptive Data Rate (ADR), part of the LoRaWAN standard, where the network server
determines the optimal rate of communication for the module based on current signal conditions. In the
best radio conditions, the module will use its highest data rate (DR5) in order to be as energy efficient as
possible. When signal conditions are poor, the network server will incrementally lower the data rate until it
is able to receive the message. When the data rate is low, the energy consumption per telegram will
increase.
6.6 Transmit interval
The transmit interval sets how frequently the module transmits data on the LoRaWAN network. The
parameter can be set to a value between 5 and 1440 minutes (i.e. between 5-minute and daily values.)
If Lora Frequency Band L or N (Radio characteristics, Page 24) (0,1% Duty cycle
limitation), is used for transmitting messages (configurated by network server operator)
the minimum transmit interval for DR0, DR1 and DR2 should be set to minimum 20 min.
This will not affect the transmit interval if EcoMode is activated.
The user must always make sure the limits of the local Max. e.r.p and Duty cycle for the
current frequency band is to be followed.
6.6.1 EcoMode
When EcoMode is active, it is able to achieve a battery-life of at least 11+1 years by utilizing a table of
allowed transmit intervals settings for each data rate. When radio conditions are poor (and data rate is
low), the module will be able to send data less frequently in order to conserve battery-life. When signal
conditions are good, the module will be able to send data more frequently. When EcoMode is enabled,
the module will continuously check if the set transmit interval is “allowed” by the EcoMode table. If a lower
transmit interval is needed for the specific data rate in order to achieve 11 years of battery life, the
module will adjust the parameter accordingly.
Table 3 shows the transmit intervals that the module will use for different data rates in order to achieve a
11-year battery-life.
Data rate
Transmit interval
DR0
180 min
DR1
120 min
DR2-DR3
60 min
DR4
30 min
DR5
20 min
Table 3: Transmit intervals for different data rates in EcoMode
.
If EcoMode has been disabled, guarantees about battery-life is no longer valid (even if
EcoMode is activated later).
6.7 Message formats
CMi4160 has six different message formats:
Standard
,
Compact
,
JSON
,
Scheduled
– Daily redundant,
Scheduled
– Extended
and
Combined heat/cooling
. Each message type will be described in detail in this
section.
6.7.1 Message structure
Message formats
Standard, Compact, Scheduled
– Daily redundant. Scheduled – Extended
and
Combined heat/cooling
are encoded on M-Bus format (date/time field are encoded on M-Bus format F).
