User Manual

Table Of Contents
On Air Message Format 3-4
SmartPoint Module for the Elster A3 Meter ECMTM40000
3.3 Addressing
Endpoint addresses are also called Meter ID, FlexNet ID, or Tx ID. In a FlexNet protocol packet, the endpoint
address is carried in the Meter ID field defined above.
3.3.1 Command Addressing
The Receiver will accept commands that are addressed to it via the Device ID of the on air message.
The three accepted addresses are one that matches its own Device ID, one using the Broadcast
Address, or, lastly, one using the Group Address.
3.3.2 Broadcast Addressing
A message sent with the Broadcast Address, which is all 1’s or 0xFFFFFFF = 268435455, is
processed by all meters if the message is a command type that can be broadcast. Broadcast
messages are not acknowledged.
3.3.3 Group Addressing
FlexNet group addressing can follow one of two conventions.
3.3.3.1 Group Addressing, Preferred Method
The preferred method is to set the Group Address Indicator bit in the Repeat Level/Status byte as
described in Section 3.1.7 and then place the destination group address in the Meter ID Number
field as described in Section 3.1.3. All modern FlexNet endpoints support this method. This does
not work with early FlexNet devices.
3.3.3.2 Group Addressing, Legacy Method (deprecated)
A message sent with the Tx Id Number field set to Group Address, which is all 1’s except for the
last bit or 0xFFFFFFE = 268435454 is a legacy Group Addressed message. For legacy group
addressed messages except for Ping Command types, the group address is found at byte offset
23-26 of the application data. For Ping Command messages, the group address is found at byte
offset 9-12 of the application data, see Section 5.3.4.