User's Manual

Sensus Metering Systems-North America Inc. CellNet Water MTU User’s Guide
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adversely affect the battery life of the
endpoint.
2.2.2.4 Diagnostics
[Ref 2] describes the diagnostics that are available via the CellNet RFLAN1
Protocol. For details on diagnostics, please refer to [ref 2].
When an endpoint detects an error condition, these conditions are reported via
diagnostic bits in the RF LAN1 Frames transmitted by the endpoint. While the
error condition exists, the endpoint will transmit packets with the corresponding
diagnostic bit set. If the error condition clears, the bit will be set for the next 14
transmitted packets following the clearing of the condition. Thus, diagnostic bits
will be set based on an error condition for a minimum of 15 packet
transmissions.
There are 4 diagnostic bits provided:
Bit Description
S Sensor Bit: This bit is set if an error occurs when reading the register.
R Low Battery: This bit will be set when the endpoint has approximately 7
days of battery life left.
W Watchdog Reset: This bit will be set at any time the unit resets. This will
almost always be due to a watchdog reset, however might occur due to
events such as a direct lightening strike.
C Memory Corruption: This bit will be set if at any time the endpoint’s non-
volatile storage becomes corrupted. Note that endpoints are built to
recover gracefully from this situation, however may not be able to recover
if a memory device is damaged (say as the result of a lightening strike), or
if the product has reached the end of its useful life-cycle.
Table 2-9 Description of Diagnostic Bits
2.2.2.5 Forcing a Meter Read
Since a technician might have to wait up to 30 minutes to receive a reading of
the meter based on the timing described above, the RF Buster can be used to
force a read of the meter. An endpoint (that has been activated, and is properly
connected to a register) will always respond to a magnet event in the manner
previously described.
2.2.2.6 Deactivation