User Manual

URFI OVERVIEW
Universal RF Interrogator ? Host Programming Guide Page 9
AMCO Automated Systems • P/N 52845G125 Rev 1 FEB 2004
2. The transponder then calculates an error-detection code which must
be verified by the handheld terminal before the transponder data can
be acquired and stored.
3. The ReadIt software compares the current meter reading with hi/low
audit values (established by the billing department and entered into
the route file prior to reading meters) and it looks for readings that fall
outside those limits. The handheld terminal can be programmed to
issue audible or visual warnings when a read value exceeds preset
limits, regardless whether the read was acquired manually or
automatically via RF.
4. Upon rec eipt of a response, the URFI checks the transmission
frequency of incoming data to verify it is a valid frequency range for
TRACE transponders.
RF Signals and Conditions
URFI Range. As a rule, transponders within approximately 300 feet of
the URFI (with no obstructions between URFI and transponder) should
receive interrogation signals and respond appropriately. Indoor meters
can be read through most walls from a distance of up to 100 feet.
Obstructions. Line-of-sight provides the optimum transaction range.
Although the URFI can read transponders through walls and fences, any
obstacles between the URFI and transponder may reduce the range at
which successful transactions may be conducted. Metallic obstacles
(vehicles, trash cans, metal sheds, etc.) in the path will severely impede
or block the transmission of RF signals.
Transaction Capacity. The URFI can interrogate and acquire
transponder data in less than two seconds per transponder.