CMi4110 User’s Manual English v1.3
CMi4110 User’s Manual English v1.3
page | 17 (27)
[2018-06]
V1.3
6.6.2.4 Scheduled mode
When using message format
Scheduled
, 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. There are
two types of scheduled mode message types:
daily redundant
and
extended
.
Message
Time interval
Description
Clock
message
Once per day
The clock message presents the current time of
UH50/UC50. It can be used to verify that the clock
is correct and has not drifted more than accepted.
Byte 0 = 0xFA
Byte 1 = DIF, 0x04 = valid, 0x34 =invalid
Byte 2 = VIF, 0x6D
Byte 3-6 = 32-bit date/time encoded as M-Bus
format F
Data message
Determined by MaxDTx
parameter.
The data message contains the fields listed in
Table 11.
Table 9: Clock message and data message
The clock message will be transmitted once every day and the data message at least (regulated by
MaxDTx parameter) once every day (on LoRa port 3). Figure 8 illustrates the principle. 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 1-30 minutes. The meter
readout for the clock message occurs at a random hour (00:00-23:00) at a random minute in the 35-45
interval. The clock message will be transmitted immediately after readout.
When using message type S
cheduled
, the MaxDTx cannot not be set higher than 24.
The transmit interval of the data message is adapted to current data rate and MaxDTx settings. Note that
for message type
Scheduled
, the MaxDTx parameter can only assume the values listed in Table 10.
Parameter
Values
MaxDTx
1, 2, 3, 4, 6, 8, 12, 24
Table 10: MaxDTx values for message type scheduled
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