User Manual

Model REXUA PCBA manual
General
The Model REXUA printed circuit board assembly (PCBA) contains a frequency hopping spread spectrum radio
operating in the 902.4-927.6 MHz ISM frequency band plus a DSSS radio operating in the 2.4 GHz ISM band.
It also contains circuitry for electricity metering. When the REXUA module is installed in a plastic housing it
forms a complete electricity meter. Installations of multiple REXUA meters comprise part of an Advanced
Metering Infrastructure (AMI) system that utilizes a proprietary network architecture and protocol devised by
Elster Solutions.
Device specifications
Table 1: 900 MHz Radio Specifications
Classification Frequency Hopping Spread Spectrum
Maximum Output Power 250 mW
Frequency Band 902.4 - 927.6 MHz
Number of Channels 25
Channel Spacin
g
400 kHz
Mode EA LAN1 EA LAN2
Data Rate 35.5 kbps 142 kbps
20 dB Occupied Bandwidth 250 KHz < BW < 400 KHz 250 KHz < BW < 400 KHz
99% Occupied Bandwidth 250 KHz < BW < 400 KHz 250 KHz < BW < 400 KHz
Max channel dwell time < 0.4 seconds within a 10 second period
Classification Frequency Hopping Spread Spectrum
Maximum Output Power 1 W
Frequency Band 902.4 - 927.6 MHz
Number of Channels 64
Channel Spacin
g
400 KHz
Mode NGC
Data Rate 50 kbps, 150 kbps or 200 kbps
20 dB Occupied Bandwidth 100 KHz < BW < 400 KHz for 50/150/200 kbps data rates
99% Occupied Bandwidth 100 KHz < BW < 400 KHz for 50/150/200 kbps data rates
Max channel dwell time < 0.4 seconds within a 20 second period
Table 2: 2.4 GHz Radio Specifications
Classification Digital Modulation
Maximum Output Power 100 mW
Frequency Band 2405 - 2470 MHz
Number of Channels 14
Channel Spacin
g
5 MHz
Mode ZigBee
Data Rate 250 kbps
6 dB Occupied Bandwidth 1.613 MHz
99% Occupied Bandwidth 2.44 MHz
FCC and Industry Canada Compliance
The radio module is manufactured directly onto the meter main circuit board, and the module is inserted into
the electronic housing of the meter at manufacture. It has no user-serviceable parts.