CMi6140
User’s Manual English
CMi6140
User’s Manual English
page | 20 (38)
[2022-09]
V1.2
Example 2
A device is configured the following way:
•
Message encoding: SenML/CBOR/M-Bus
•
Auto upload order: FIFO
•
Measurement interval: 60 minutes
•
Transmit interval: 60 minutes
•
Transmit offset: 15 minutes
•
Transmit delay: 30 minutes
•
Maximum uploads per transmission: 4
•
Upload maximum age 72h
•
Device max payload size: 12 (readouts per telegram)
A network issue caused the module to be offline for 5 days, while still reading and storing measurement
data. When the device manages to go online the following scenario takes place.
•
The device will start by transmitting measurement data that is 3 days old (FIFO order)
•
The device will send 4 measurement telegrams per hour, at a randomly chosen time between
minute 15 and 45
•
Each telegram contains 12 meter readouts, totaling 4 x 12 = 48 readouts per transmission
•
The device will take approximately 2 hours to “catch up” and start sending one measurement per
hour
7.4
Meter data transmissions
CMi6140 sends meter data messages according to it
’s transmit interval settings. Meter read out is always
related to meter’s clock at time 00:00:00. Transmission time is randomized between read outs.
The user can customize the data sent from the module by configuring
message format
and
encoding
of
the telegram.
7.4.1 Message formats
CMi6140 has four different message formats, Standard, Extended, Combined and Pulse. By selecting
message format, the user can decide what the meter registers that will be included in the telegram.
In message format Standard, all meter registers in Table 9 is included in the telegram. For message
format Extended, all meter registers of Table 9 and Table 10 will be included in the message. Message
format Combined
,
is covered in Table 11, and Pulse
in
Table 12.Below each message format table, the
same message format but in JSON encoding is displayed.
Standard: Message format ID 66
Field
Description
Date and
Time
(see Note 1)
6
INT32
Date and Time (Type F),
Example: 046Dxxxxxxxx
M-Bus Format F for Date & Time
Meter ID
(see Note 1)
(see Note 2)
6
BCD8
According to M-Bus EN13757-3 identification
field
e.g. 0C78xxxxxxxx
Energy
6-7
INT32
Example: 0406xxxxxxxx, 040Fxxxxxxxx
