Liberty 100 Smart Electricity Meter Technical Reference Manual
6.1 Functions of the Hub
The hub has the following interfaces:
● ZigBee Module - a ZigBee 2.4 GHz low-power radio facilitates communication between other HAN
devices such as a gas meter or IHD.
● GPRS WAN Module- for communication to HES.
It provides the following functions:
● Communication to/from HES via WAN
● Sends meter readings and status as scheduled or on demand
● Sends notification of events (including connection status) if configured
● Accepts commands from HES for Electricity meter or HAN devices
- Including payment mode, financial configuration, configuration of reading schedule, tariffs,
change of supplier/tenancy, adding credit, arming/disconnecting switch/valve, clearing event
log, synchronise clock.
● Communication to/from HAN devices
● Forwarding of commands to HAN devices
- Including payment mode, financial configuration, configuration of reading schedule, tariffs,
change of supplier/tenancy, adding credit, arming/disconnecting switch/valve, clearing event
log, synchronise clock.
● Receiving data and status from HAN devices
● Mirrors gas meter data for the IHD and HES
● Manages firmware update for meter and HAN devices
● Notifies alerts from HAN devices to HES via GPRS
● Sends last gasp message to HES (if configured) when the meter indicates that supply voltage is below
the threshold.
Note: Last gasp message will be sent only if configured and if optional backup power supply is fitted. Multiple
mains power outage within a 10 minute window could affect the meters ability to send a ‘last gasp’ message.
6.2 The Hub Rear View
Figure 16: Inside of the Communication hub
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