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Features of SNS Battery-powered Sensor Devices
Set Monitoring Thresholds to Prevent Loss of Sensitive Assets
If you have sensitive assets such as blood, medications, or tissues, you can set up the sensor
devices to report readings as many as 15 times per hour and to generate alerts and send
notifications as soon as thresholds are reached.
Be sure that settings are configured both in the sensor device and in the AMP sensor device page.
In this scenario, you will set the sensor's transmit period to a shorter time, and edit the sensor
device's reporting period to the same number of minutes as the transmit period.
Note:
Then, you will use the Battery Sensor Software Configuration utility to set the transmit period in the
sensor devices. You will also set the alarm thresholds in the sensor device. If the sensor device
detects that a threshold has been exceeded the LED will flash and the sensor will transmit a
reading to the AMP, where an alert will be active. See Appendix B: Battery Sensor Configuration
Utility on page 57 for instructions on setting these alarm thresholds.
Note:
Operational Sequences
Turn on the Sensor Device
Place the on/off switch in the 'on' position to turn on the sensor device.
Normal Operation
When the USB Programmer is not plugged into the sensor and the sensor is powered on, the
sensor is in Sensor mode. The sensor spends most of its time in this mode in a very low power
state (sleep). When a transmit period is due, it powers up the Wifi radio, attempts to link to the
specified wireless network, transmits its data and then goes back to sleep.
The sensor transmits based on a transmit period or entering an alarm state. The sensor will go
through following steps in order to connect to a network and deliver data:
1. Associate
2. Authenticate
3. Request IP from DHCP Server (if set to dynamic IP)
4. Request from Name Server IP address of hostname (if a hostname is used for the Destination
address and DNS Server specified).
5. Sensor sends UDP packet with sensor data.
6. Host sends UDP acknowledgement packet.
Check-in with the AMP
The sensor will initiate a delivery attempt to the AMP, known as a 'try', repeatedly (typically every
30 seconds) until either an acknowledgement is received from the host or the number of tries has
been exhausted. If no acknowledgement is received, the sensor device will stop transmitting and
wait for the next transmit period or when an alarm is triggered. The sensor follows this delivery
mechanism for both when the transmit period arrives or for alarm attempts.
Primex Wireless, Inc.
Shorter transmit periods (more frequent transmissions) shorten battery life
and increase network load.
Thresholds configured in the sensor device using the Battery Sensor
Software Configuration utility can only be changed using the utility. If you
relocate the sensor device, for example, moving it from a refrigerator to a
freezer, you will need to reconfigure the device using the utility.
(depends on the type of security)
SNS™ Temperature and Humidity Sensors Installation Guide
Operational Sequences
23
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