Elvaco CMi4140, Руководство пользователя

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CMi414
0 User’s Manual English
CMi414
0 User’s Manual English
page | 10 (26) [2020-06]
V1.1
Set absolute
time Sets the time of the meter. N/A Writeable N/A N/A
Set Time
Relative Adjusts the time of the meter
relative to the current time. N/A N/A N/A Writeable
Set UTC
offset Sets the UTC offset of the
meter. N/A Readable /
Writeable
Readable Witeable
Configuration
Lock Locks the module to prevent
unauthorized access. Open Readable /
Writeable
Readable Writeable
LoRaWAN settings
Device EUI
Unique module identification
number. Not configurable. Device-unique
64-bit number
Readable Readable N/A
Activation
type Sets the way the device joins
the LoRaWAN network. OTAA Readable /
Writeable
Readable N/A
Network join Displays whether the module
has joined the LoRaWAN
network or not. N/A Readable Readable N/A
Join EUI Application ID that
determines where data ends
up.
0x 94 19 3A 03 0B
00 00 01
Readable /
Writeable
Readable N/A
Device
address 32-bit address used by the
module to identify itself on the
LoRaWAN network. N/A Readable /
Writeable
N/A N/A
Current data
rate The current data rate used for
the module. N/A Readable Readable N/A
Table 3: Configuration options
6.4 Time handling
The module relies on the meter’s clock for keeping time. Time in the meter is assumed to be in standard
local time (no DST). When synchronizing time in the meter using the OTC App, local standard time is
always used, even if DST is in effect. The timestamped meter data sent from the module can be adjusted
to be sent in UTC by specifying the “UTC offset” configuration parameter. The UTC offset will be
subtracted from the timestamp prior to transmission. If the meter is in Sweden, which uses CET (Central
European Time), it should have UTC offset set to +60 (+1h). In this case at time 12.00 a telegram is sent
with timestamp 11.00 as this is the corresponding UTC time. A meter in New York (USA) should have a
UTC offset of -300 (-5h) etc. A UTC offset of 0 means the meter time is used as-is.
If the meter is set to used DST this is ignored by the module and the standard time is used. Thus, the
time on the meter’s display may not match the time in the telegram or in the OTC App.
6.5 Adaptive data rate (ADR)
CMi4140 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