User Manual

Table Of Contents
FlexNet SmartPoint Radio Overview A-4
SmartPoint Module for the Elster A3 Meter ECMTM40000
In these locations, the mPass mode communications method is used.
The mPass mode also is the modulation type used by the TGB when it communicates with any
SmartPoint device. These communications constitute (but are not limited to):
Timekeeping chores (allowing the EMD to set its internal clock, correcting for EMD crystal
aging by re-tuning the EMD RF frequency within 50 Hz, etc.),
Polling tasks (gathering data from an individual EMD such as rate tables etc.), and
Command execution (turning electricity off or on, etc.).
SmartPoint meters, capable of using Normal mode operation, receive using mPass
modulation from the TGB and other meters which may not be able to communicate with the
TGB, and transmit using 7FSK modulation back to the TGB. These units transmit on the
same frequency the TGB uses for its receive operation.
SmartPoint meters that are relying on mPass mode to communicate to the TGB through
another SmartPoint device, utilize mPass modulation for both receive and transmit
operations. They transmit on the same frequency that the TGB utilizes for transmission.
A SmartPoint device that cannot communicate directly with a FlexNet tower is considered
an Out of Range Device (ORD). A SmartPoint device that can communicate directly with a
FlexNet tower is considered a candidate to be congured as a “Buddy Device.”
Unlike other communications, no routing information is necessary for the Buddy message
to be repeated. Any meter that hears the Buddy message will repeat using a pseudo
random algorithm to minimize network loading. Upon reception at the TGB of a Buddy
message, the TGB broadcasts a quench signal informing other meters still waiting to repeat
the message that it has been received and they should no longer attempt to repeat the
message.