User Manual

Receiver Section 6-1
SmartPoint Module for the Elster A3 Meter ECMTM40000
6 Receiver Section
The device receiver section may be de-populated to reduce cost for a transmit only version using the same printed
circuit layout.
6.1 Receiver Requirements
6.1.1 Operation Modes
Receivers always listen for messages on a line powered end-point. Battery operated receivers listen
for message only after transmitting a message. The associated tower receiver queues up commands
to battery powered end-points and transmits them only after reception of an end-point message with
matching ID.
6.1.2 RF Link Requirements
Uses the end point Repeat mode modulation format.
6.1.3 Sensitivity
-109 dBm @ 4800 Baud
6.1.4 Diversity
Temporal only, Interleaved and ½ bit rate Viterbi convolutionally encoded with constraint length K=3.
6.2 Receiver On Air Command Messages
6.2.1 Command Types
The Receiver can accept the Application Code 7 Command Messages with the following Command
Types. The format of the data in the actual fields is the same as previously defined unless otherwise
stated. The address (Id Number) in the command is always that of the final destination. The tower may
add a Buddy Address for routing purposes if necessary. When the device receives a command with its
address in the Buddy Address field, it will repeat the command on the mPass channel to provide an
extra hop for out of range devices.
Type Description Broadcast Group
0 Command Acknowledge N/A N/A
1 Set Static Setup No Yes
2 Set Crystal Offset No No
3 Set Lat / Long No No
4 Set Voltage Quality Settings Yes Yes
5Set Time Yes No
6 Load Shed Yes Yes