User's Manual
Table Of Contents
- Introduction
- Product Description
- Operating Instructions
- Outputs
- Testing
- Installation and Removal
- Glossary
- Display
- Nameplate Information
- Wiring Diagrams
- Technical Specifications
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Contact Elster Electricity for information
30 November 2006 2-1
REX Meter
Technical Manual 2 Product Description
2 Product Description
System Overview System Architecture
The REX meter main circuit board contains all the electronics that make up the
meter and integral registers. See Figure 2-1 for the single phase REX meter
block diagram (including the integral 900 MHz radio). See Figure 2-2 for the
Form 12S REX meter block diagram (including the integral 900 MHz radio).
Figure 2-1. REX meter block diagram (single phase meters)
Meter engine
EEPROM
Microcontroller
LCD
900 MHz radio
6.4 V power supply
3.3 V power supply
3.3 V
16-pin
header
Optical port
20.48 MHz
CT
Current
Resistive
divider
Voltage
6.4 V
SPI bus #1
Wh rec
Wh del
fref = 20.48 MHz
fref = 20.48 MHz
SPI bus #2
Tx data
Rx data
Technical
Manual
REX
Meter