User's Manual

DRAFT
8 TWACS
®
- ORION
®
for CENTRON
®
Meter User Guide
Theory of Operation
Electric Meter Transceiver (EMTR-2)
The EMTR-2 is an electronic module assembly (EMA) that is installed in a
TWACS-enabled CENTRON meter. The EMTR-2 is connected to the
EMT-3C-MP transponder during meter/transponder integration. The
EMTR-2 adds functionality to the host EMT-3C-MP. It does not
communicate over the power line, but uploads the data to the EMT-3C-MP
that has power line TWACS capabilities.
The EMTR-2 can communicate with up to four ORION transmitters. Data
from the ORION transmitter is relayed to the EMA. This data is accessed
by the TNS across the TWACS network.
Near the top of the hour, the EMTR-2 listens (for 12.5 seconds) for
communication from an ORION transmitter. Then, for 8.5 seconds the
EMTR-2 listens for an HHTR-LP. This pattern cycles 35 times. No further
communication occurs until the next top of the hour. The top of the hour is
set in TNS. Refer to Metering Maintenance in the TNS User Guide for
instructions.
Figure 1.1 Electric Meter Transceiver