User's Manual

Sensus Metering Systems-North America Inc. CellNet Water MTU User’s Guide
15
2.2.2.3 Operation
Once the unit has been activated, it will read the meter and transmit
Consumption data using the timing configured at the factory. Packets
transmitted by each endpoint are uniquely identified by a 10 digit LAN Address.
The 10 digit LAN Address of each endpoint can be found on the label applied to
the endpoint enclosure, and can be queried through the programming interface.
The default timing of RF transmissions from the CellNet Water MTUs, and the
type of data transmitted, is as follows:
• Consumption Data: Consumption data consists of the current
cumulative meter reading. Consumption data is transmitted once every
15 minutes (15 minute intervals)
• Administration Data: Administration data consists of the current
cumulative meter reading, as well as the current configuration of the
endpoint. Administration data is transmitted once every 60 minutes (1
hour intervals).
In order to guarantee that all meters are able to be read over the course of a
few hours, the meter read/RF transmissions are scheduled for a random time
during each interval. Thus, the time between two consecutive Consumption
data read/transmissions could be as short as a couple of seconds, or as long
as 30 minutes.
Consumption data contains only the current cumulative meter reading. The
CellNet Network requires additional data to ensure the integrity of the network
over time. Thus, in addition to the Consumption data that is transmitted 4 times
per hour, Administrative data is transmitted once per hour.
Administrative data provides the network with the configuration of the endpoint,
in addition to a cumulative reading of the meter. Thus, the packets used to
convey this data over the air are much larger than those used to convey
Consumption data – and are transmitted less often.
The meter read/RF transmission required to convey Administrative data over
the network is randomized to occur at an arbitrary time within the hour. Thus,
the time between two consecutive Administrative data read/transmissions could
be as short as a couple of seconds, or as long as 2 hours.
NOTE: The interval timing of the endpoint is
configurable as per [ref 2]. Most endpoint
parameters can be programmed via the
Programming interface.
For the remainder of this document, the reader may assume that any behavior
mentioned can be configured via the programming interface unless otherwise
indicated.
NOTE: The re-programming of endpoint
parameters should only be performed by
knowledgeable technicians, as it can