Gateway / Sensor Settings

This page provides more details on a specific sensor. Changes to the sensor settings may be submitted by clicking the “Save Changes” button at the bottom of the page.


Sensor Information

Node Name: The name of the node that this sensor belongs to (as assigned by the user on the Nodes > Settings page or by default the serial number of the node).

Serial: The serial number of the node that this sensor belongs to.

Sensor Name: The human readable name associated with this sensor.

ID: The sensor ID number. Each sensor type has a unique ID.

Units: The units of data the sensor reports data in.

In Sync: This flag indicates if there are over-the-air commands pending for this sensor. Over-the-air commands are issued as a result of an “Action” command being sent using the drop down list on the Nodes > Settings page, or from this page, or by changing a setting. If there is a command pending, the following icon will be shown:

Export Enabled: Shows whether or not this sensor is enabled for data export. If this check-box is ticked, export is enabled for this sensor. If this check box is not ticked, export is disabled for this sensor. If export is enabled, data received from this sensor will be exported from the Gateway, for example to 3rd party software systems. Export is disabled by default for all sensors.

Export ID: The export ID is a unique identifier that is exported with each data point to identify the source of that data. It can be used in 3rd party systems to define where a particular data feed is coming from. It is only relevant if data export is enabled for a sensor. The Export ID defaults to the node serial number combined with the sensor ID, separated by an underscore ( _ ).

Example: the default export ID for the Total kWh sensor (Sensor ID = 333) on the ZEM-61 three phase electricity meter with serial number 000D6F0001A303D4 will be: 000D6F0001A303D4_333

This unique identifier can be used in 3rd party systems to identify this data feed as coming from the Total kWh sensor on the three phase meter with serial number 000D6F0001A303D4. This export ID can be changed from the default value, but must be unique on the Gateway.

Sensor Properties

This section will be populated dynamically based on the properties that the node reports for this sensor. As a minimum set the Reporting Mode, Reporting Interval, Logging and Reporting Delta properties will always be present. If the property is editable, a text box or a drop-down list will be available to facilitate modifying the property value.

If the reporting mode is set to “Off”, this sensor will not report data. The available reporting options are shown below. “Interval only” reporting will report data points periodically based on the reporting interval. Interval data will not be time-stamped exactly on the minute. “Snap to clock” mode forces the sensor to send a data point on the minute.

When using a relatively low-bandwidth wireless sensor network, and especially with large networks of sensors, it is generally better to minimize the amount of data being produced. However, it may also be a requirement to capture events by reporting data as frequently as possible. To deal with these conflicting requirements, various ‘Delta Reporting Modes’ are available on all sensors.

“Delta only” mode reports a data point when a change is detected that exceeds the value defined in “Reporting Delta”.

Example: If Reporting Delta is set to 5 volts for the RMS voltage sensor on a ZEM-61 three phase electricity meter and a change greater than or equal to 5 volts is detected, the sensor will report a data point. If the voltage continues to change, another data point will be reported 2 seconds later (for mains powered products). Reporting at a 2 second interval will continue provided the value continues to change.

This feature allows the system to capture rapid and large changes as if the system had a reporting interval of 2 seconds (30 seconds for battery powered products), without producing large volumes of data while the measured parameter is stable within the delta limits defined.

This facility is useful for monitoring unusual temperature rises, for example when a freezer door is opened, for capturing the in-rush current of a large motor or for capturing the in-rush current for large incandescent lighting loads.

“Interval and Delta” is a hybrid of Interval and Delta reporting, where data will be reported on the interval, but also if a change is detected.

“Interval or Delta” mode is similar to the above mode, but the interval counter will be reset if a change is detected.

Sensor Reporting Modes

If logging is enabled the sensor will log data when the Gateway is not available and then report the data as soon as the Gateway comes on-line again. Most nodes have a logging capacity of 10,000 data points. To calculate the amount of time a particular node can log data for, first calculate how many data points will be produced per day for that node, and then divide the 10,000 point buffer by that number to get the number of days the node can log data for.

Example: A temperature monitoring node has two sensors: temperature and battery level. The temperature sensor is reporting data every 15 minutes, and the battery level sensor reports once per day. This node will produce 97 data points per day. Dividing the logging capacity (10,000 data points) by the number of data points produced per day = approximately 103 days.

If a node’s logging buffer has recorded a large amount of data, it may take some time for this data to be uploaded from the node when the wireless sensor network is available again. All logged data will be uploaded in sequence, starting with the oldest data points. When a data message had been acknowledged, the next data point will be sent. Logged data can be cleared by issuing a “Factory Reset” command from the “Action” menu on the Nodes List page and enabling ‘allow join’ mode to allow the node to re-join the network after it has been reset.

If a sensor value is editable, this will be facilitated in this section by means of a “Set Sensor Value” text box. For example, this feature can be used to reset cumulative sensors such as kWh, or initialise them to a particular value.

If the property values in this section are incomplete or there is an absence of properties that would be expected for this product (i.e. that the fields are showing a dash “-“ symbol), try refreshing all properties for this node using the “Action” drop down list for this sensor on the Node Settings page. It may take a number of minutes for all sensor properties to be refreshed.

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