User's Manual

10 TWACS
®
-ORION
®
for UMT Products User Guide
System Overview
RF communication links the ORION (located at the auxiliary meter) to the
EMTR-3 (located inside a nearby electric meter.) This communication enables
successful operation of the Automatic Meter Reading (AMR) system.
The TWACS
®
- ORION
®
system operates in the 902 - 928 MHz Industrial/
Scientific/Medical frequency band. The Badger ORION devices periodically
transmit bursts of digital data containing meter reading information on a requency
of 916.45 MHz. These are one way transmissions, sent as a two millisecond burst
every four to five seconds, and are field strength limited under section 15.249 of
FCC regulations. The EMTR-3 devices are manufactured by DCSI and recieve
transmissions from any ORION devices within range that have been assigned to
that EMTR-3. The EMTR-3 then passes the data to the UMT-R-F MP or
UMT-C-KV MP TWACS transponder. When requested by the utility, the meter
data is returned using the TWACS power line communications system.
The HHTR-3 is a tool used by an installer to set up and configure the EMTR-3 to
listen for transmissions from specific ORION devices. It also maintains a record of
installation activities which may be downloaded to a PC via hardware link at the
end of the day.
The following block diagram summarizes the interfaces and communications
between the system components.
DRAFT