User's Manual

AMR-304-R1
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METER READING SYSTEM VEHICLE TRANSCEIVER UNIT (VXU)
APPLICATION: The Invensys RadioRead
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Vehicle Transceiver Unit
(VXU) is a portable radio-based meter reading device which can
be used in any vehicle providing 12-volt DC power. The operator
simply sets up the system in the vehicle, loads the desired meter
reading route into the computer and drives along the meter reading
route in proximity to the meters to be read. The meter reading data
is collected while the vehicle traverses the route. The complete VXU
package includes everything needed to read meters that are
equipped with Invensys Meter Transceiver Units.
RADIOREAD
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OPERATION: The Invensys RadioRead system
uses two-way data communications between the VXU and Meter
Transceiver Units (MXU) connected to compatible utility meters.
When reading meters, the VXU transmits an alert signal to the
MXUs, with the operator having the option of directing the alert
signal to all MXUs within range (blind reading mode), or to
individual MXUs (geographic reading mode). When the alert signal
is received, each MXU responds by transmitting its data in direct
sequence spread spectrum modulation. The VXU receives this data
and acknowledges by sending the MXU a message to return to its
low power sleep mode.
SYSTEM RELIABILITY: The Invensys RadioRead system's
communication architecture ensures reliable meter readings. The
VXU determines clear channels in the 902-928 Mhz spread
spectrum radio frequency band. When the VXU transmits the alert
signal to the MXUs it also establishes the frequency to be used to
transmit back this meter reading data. This signal selecting and
synchronization capability provides a highly efficient meter reading
process that is reliable even in a noisy radio frequency
environment.
Meter reading is virtually error-free when using RadioRead to read
meters equipped with Invensys absolute encoder registers. The
absolute encoder registers provide readings taken from actual
positions of their odometer wheels. When readings cannot be
obtained due to damage, vandalism or tampering, the error
condition will be indicated at the time of reading. High or low
customer usage patterns can also be verified at the time of the
reading.
PORTABILITY: Through the use of advanced miniaturized design,
the radio electronics can be packaged in a very compact
enclosure. With the addition of a portable computer, connecting
cables and antenna, the complete VXU package can be stored in
its handy carrying case, ready for fast and easy setup in any
vehicle. This portability eliminates the need to purchase and
maintain a dedicated meter reading vehicle.
D
ESCRIPTION
S
PECIFICATIONS
SERVICE Radio based mobile utility meter reading system
PHYSICAL
CHARACTERISTICS
VXU in metal case with carrying handles.
Portable computer in plastic housing.
Connection cables, magnetic mount antenna and
hardside component carrying case included.
DIMENSIONS
VXU
Computer
Carrying Case
Wide: 15.10" (383.54 mm)
Deep: 11.24" (285.49 mm)
High: 5.22" (132.58 mm)
Weight: 21 lbs. (9.53 kg)
Wide: 11.8" (299.72 mm)
Deep: 8.9" (226.06 mm)
Weight: 6.64 lbs. (3.01 kg)
Wide: 19.25" (488.95 mm)
Deep: 13.78" (350 mm)
High: 11.87" (301.49 mm)
Weight: case: 11 lbs. (4.99 kg)
Complete assembly: 39 lbs. (17.69 kg)
POWER
VXU with
Portable
Computer
12-volt DC
DC adapter through VXU
(with battery back-up; computer only)
COMMUNICATIONS Transceiver to computer:
Radio Transmit: 956 Mhz (AM)
Receive: 902-928 Mhz,
Direct Sequence Spread Spectrum
READING RANGE Dependent on MXU installation and RF propagation at time of
reading
APPROVALS
US:
Canada:
Mexico:
FCC
Industry Canada
SCT
LICENSE
REQUIREMENTS
Equipment licensing requirements are coordinated by
Invensys for FCC, Industry Canada and Mexican SCT. Radio
licensing may be required by government agencies for other
countries. Users should consult their respective government
agencies for licensing requirements.
RadioRead
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