User's Manual

DRAFT
22 FIREFLY AMR REFERENCE MANUAL
DRAFT
©
Datamatic.com, Ltd. 2000 - 2005
volatile memory in a LIFO (Last In, First Out) manner. A total of 16,256 intervals are
saved in the LIFO. The profile data is extracted via a wireless link using the
ROADRUNNER X7 handheld computer. At a 15-minute profile interval, 165 days of
profile data is collected.
Power
The unit is powered from the 240VAC line within the electric meter. Beware that the unit
is not grounded, but is floating at the AC line potential. DO NOT TOUCH the electronics
when connected to 240VAC. Also be aware that components in the power delivery
system do heat up. It is important to approach all devices connected to AC power with
caution to ensure safe handling. ESD precautions should always be used when handling
electronic equipment.
Electric FIREFLY Specifications
Functional
Meter reading 9 digit 99,999,999.9 watt-hours, 0.1 watt-hour units; tracks
mechanical register—forward and reverse.
Reverse meter reading 9 digits 99,999,999.9 watt-hours, 0.1 watt-hour units
cumulative reverse consumption.
Meter constant User configurable, 0.1 watt-hour revolutions. Typically 7.2
watt-hours per rotation: constant 72.
Reverse rotation flags Set if reverse rotation observed, 2 month FIFO.
Demand data Units of kilowatts, constant 72 15-minute demand, and 30-day
interval, 2 intervals FIFO.
Power outage Counts and day/time stamps power outage.
Profile data User set interval, between 1 minute and 4 1/4 hours.
Signed 16-bit data.
Units of 0.1 watt-hours, adjusted by scale factor.
16,256 intervals in FIFO organization.
Example: 15 minutes per interval provides 165 days data.
Local clock Crystal based.
Operating
Operating temperature
-40° to +85° C.
Operating voltage 240 VAC
Operating current 24 milliamps.
Sensor Infrared, optical.
Meter disk marking Painted disk.
Radio communications
FCC Part 15. 902-928MHz ISM band .
Data rate 9600bps 1-way, 19200bps 2-way.