CMi414
0 User’s Manual English
CMi414
0 User’s Manual English
page | 15 (26)
[2020-06]
V1.1
For message formats of type
“Scheduled” (Scheduled – Daily redundant and Scheduled – Extended), two
types of messages will be transmitted from the module - a clock message and a data message. The
difference between the two is described in Table 9. A detailed description of the payload of the clock
message is provided in Table 10.
Message
Time interval
Description
Clock
message
Once per day
The clock message presents the current time of the
meter. It can be used to verify that the clock is
correct and has not drifted more than accepted.
Data message
Determined by transmit
interval parameter.
The actual meter data collected from the meter. For
more information, see Table 12 and Table 13.
Table 9: Clock message and data message
DIB
Field
Size
Data type
Description
0
Message
format
identifier
1 byte
-
0xFA (=Clock message)
1
Date/time
6 bytes
32 bit binary integer
M-Bus type F
046Dxxxxxx = Valid date/time message
346Dxxxxxx = Invalid date/time message
Table 10: Payload, clock message
The clock message will be transmitted once every day and the data message at least (regulated by
transmit interval parameter or EcoMode) once every day. The transmit interval can only be set the values
listed in Table 11.
Note that although the meter readout will occur on top-of-the-hour, the data message will not necessarily
be transmitted at that exact time. The LoRa transmission will occur after a random delay of 0-15 minutes
to decrease the risk of collisions. The readout for the clock message occurs at a random hour (00:00-
23:00) at a random minute in the 35-45 interval and will be transmitted immediately after readout.
When using message format S
cheduled
, the transmit interval cannot not be set to higher
than 1440 minutes.
Parameter
Values
Unit
Transmit interval
60, 120, 180, 240, 360, 480, 720, 1440 Minutes
Table 11: Transmit interval options for Scheduled message formats
Scheduled- daily redundant
The data message of
Scheduled mode-daily redundant
contains an accumulated daily energy field, which
is updated at 24:00 each day. In other words, depending on transmit interval settings and data rate, the
field will be included in between 1-24 telegrams per day. This will increase the probability of the value
being received. For example, if the transmit interval is set to “2”, the accumulated energy read at 24:00
will be transmitted 12 times during the 24 next coming hours (every 2
nd
hour).
Figure 5: Structure, message format Scheduled
– daily redundant
