User Manual

Table Of Contents
FlexNet SmartPoint Radio Overview A-1
SmartPoint Module for the Elster A3 Meter ECMTM40000
Appendix A FlexNet SmartPoint Radio Overview
The Sensus FlexNet SmartPoint module provides wireless communication capability to electric utility meters. The
SmartPoint module interrogates the meter registers on a programmable interval from ve minutes to daily
readings. The SmartPoint module then transmits the meter consumption and status information at regular intervals.
The number of times the SmartPoint transmits is decoupled from the read setting, allowing for either greater
number of transmissions per read, or fewer. In the case of a daily read, the SmartPoint can be programmed to
transmit every six hours—providing the same information four times throughout the day.
A.1 SmartPoint Power Failure Detection and Alarm
The SmartPoint detects power failures at the meter location and sends an alarm message.
A.1.1 Power Fail Detection
The SmartPoint microprocessor (µC) monitors the power fail signal from the display board, and on
power fail, the µC sleeps all hardware and waits the Outage Time Threshold amount of time plus a
pseudo random interval of 0 to 152 seconds and then sends an Alarm power fail report message. The
on-board power-supply capacitor stores enough energy for at least one Alarm power fail transmission.
The board will continue to send additional Alarm power fail messages at 0 to 48 second pseudo
random intervals until the capacitor is drained.
A.1.2 Power Restoration Notication
Upon power restoration, the SmartPoint µC waits the Power Restore Time Threshold amount of time
and then sends 6 pseudo randomly timed Alarm Power Restore messages, followed by a meter read
message with the power restore ag set.
A.1.3 Brown-Out Detection
The alarm and voltage elds from the sensor board are monitored for brown-out (low voltage detect).
The Brown-out voltage is set via the SmartPoint Minimum Voltage Alarm Threshold. If the AC voltage
drops below this threshold, the Brown Out bit will be set in the next transmitted on-air message.
A.2 Operating Frequencies of SmartPoint/TGB Devices
The TGB receiver may operate over two frequency ranges (at its LNA input) dependent on the RF card
hardware version installed in the TGB. The frequency range given is further constrained by the actual pass
band of the duplexer/preselector lter used between the LNA and the TGB antenna.
TGB Receiver Operating Frequency: 896 To 902 MHz (Range 1) OR
928 To 935 MHz (Range 2)
The operating frequency range is selected based on whether the TGB will be operating under FCC
Part 24 NBPCS or Part 90 SMR (Range 1) or FCC Part 101 MAS (Range 2).
The TGB Transmitter may operate over the following frequency range independent of RF card Hardware
Version.
TGB Transmitter Operating Frequency: 930 to 960 MHz
The transmitter operating frequency is further constrained based on the pass band of the duplexer
lter which connects between the transmitter output and the antenna.