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Gas SmartPoint alarms
Sensus gas SmartPoint modules monitor their operation for exceptional or abnormal conditions. When the module detects one of these alarm conditions it is logged in non-volatile memory. If the module is configured for fixed-base mode, an alarm notification message transmits to the RNI.
Alarm conditions
Alarm message format
The control byte and the repeat level/status byte in the header of each message indicate the presence of alarm conditions.

Electric meter alerts
Sensus electric meters and third-party meters in a FlexNet system generate alarms, errors and warnings. These alert notifications are transmitted in multiple ways.
Water meter alerts
Sensus water meters and SmartPoint modules in a FlexNet system generate alarms. These alert notifications are viewed on the LCD or through Device Manager.
Water SmartPoint alarms
Sensus water SmartPoint modules monitor their operation for exceptional or abnormal conditions. When the module detects one of these alarm conditions it is logged in non-volatile memory. If the module is configured for fixed-base mode, an alarm notification message transmits to the RNI.
Gas meter alerts
Gas meter alerts can originate from either the SmartPoint module or the metrology.
Gas SmartPoint alarms
Sensus gas SmartPoint modules monitor their operation for exceptional or abnormal conditions. When the module detects one of these alarm conditions it is logged in non-volatile memory. If the module is configured for fixed-base mode, an alarm notification message transmits to the RNI.
- Reporting alarms
  Alarms transmit via an alarm message or read message depending on whether they are in a Walk-by/Drive-by or Fixed-Base system.
- Latching alarms
  Latching alarms are alarms that continue to report for a period of time even after the condition clears.
- Clearing alarms
  Alarms may be cleared via message rather than waiting for the alarm to expire and self-clear.
- Alarm conditions
  - North American two-way gas SmartPoint modules
    The following describes the alarms, errors, and warnings for the North American two-way gas water SmartPoint modules.
  - Alarm message format
    The control byte and the repeat level/status byte in the header of each message indicate the presence of alarm conditions.
  - Walk-By/Drive-By mode
Smart Gateway alerts
The Sensus Smart Gateway Sensor Interface reports alerts that can originate from the Smart Gateway, and its attached digital inputs and sensors.
Base Station alerts
Base Stations have eight bits for alarms, which display differently depending on the model of Base Station.

Alarm message format

The control byte and the repeat level/status byte in the header of each message indicate the presence of alarm conditions.

Note: The definition of the bytes varies slightly between two-way and one-way mode.

The control byte in two-way mode is defined as:

Table 1. Two-way Mode Control Byte
Bits	Definition
0:3	RF Sequence Number
4	LAT Delay Bit 0
5	IIT
6	Low Battery Detected
7	Payload Encrypted

The control byte in one-way mode is defined as:

Table 2. One-way Mode Control Byte
Bits	Definition
0:3	RF Sequence Number
4	Reserved
5	Reserved
6	Low Battery Detected
7	Payload Encrypted

The low battery alarm is indicated by bit 6 of the control byte.

The repeat level/status byte in two-way mode is defined as:

Table 3. Two-way Mode Repeat Level/Status byte
Bits	Definition
0	History Overflow
1	Meter Alarms
2	Reserved
3	LAT Delay Bit 1
4	LAT Delay Bit 0
5	RF Sequence Number MSB
6:7	Repeat Level

Bit 0 indicates a reading history overflow. This is the only place history overflow is reported, with the exception of the error code in reading history. It is not logged as a historical alarm.

Bit 1 indicates the presence of one of the alarm conditions. To determine the specific alarm condition(s) that are present, it is necessary to observe what is reported in the alarm message (appcode 11).

The repeat level/status byte in one-way mode is defined as:


Bits	Definition (Gas device)
0	History Overflow
1	Tilt Alarm
2	Reverse Flow Alarm
3	History Overflow
4	Reserved
5	RF Sequence Number MSB
6:7	Repeat Level

Each historical alarm condition is indicated by the respective bit in the repeat level/status byte.

When an NA2W device is configured in one-way mode for operation in a legacy network, all messages are transmitted in one-way format with one exception. Once per week, the SmartPoint module transmits a single alarm message in two-way format. Sending the two-way message (with LAT window) is done to facilitate upgrading a network from one-way mode to two-way. The LAT window gives the RNI an opportunity to send a message to the SmartPoint module to transition it from one-way to two-way mode.