User Manual

Table Of Contents
SmartPoint Module Overview 2-4
SmartPoint Module for the Elster A3 Meter ECMTM40000
2.4 SmartPoint Terminology
On-Air Messages (see Chapters 3 and 4). This term is used to describe messages sent by FlexNet endpoint
devices. The exception to this is the command message, which carries On Air Commands from the RNI
through the TGB to the endpoint (see Section 4.6).
Serial Commands (see Chapter 5). These messages are used to control a FlexNet endpoint device over a
serial interface. Many devices have a receive-only inductive coupled interface (called the Mag Loop), while
others feature a RS-232 serial interface. This creates a situation where devices receive commands over the
serial interface but respond over RF. For example, devices will respond to Ping Commands received on the
serial interface by sending a response out of the Flexnet RF interface. Devices that have RS232 interfaces
support 2-way serial communications in certain cases, such as when supporting firmware upgrade over the
srerial port.
On Air Commands (see Chapter 6): The various types of command messages are used for configuring and
querying the endpoint devices.
Ping Commands (see Section 6.2.9): This is a specific On Air Command (Type 8) that is used to query status
and readings from the endpoint devices.
For example, to get a meter to send a Setup/Configuration Message (defined in Section 4.3), you send it an On
Air Command (7) message with a command-type of Ping (8) and a Ping type Setup (15); the meter will respond
with the Setup/Command On Air Message.