Liberty 100 Smart Electricity Meter Technical Reference Manual
6.2.1 10-Pin Interface Connector Details
Figure 17: The hub interface connector details
Pin Name Function
1 VCC Isolated 4 V @ 1.4 A supply to the hub
2 VCC Isolated 4 V @ 1.4 A supply to the hub
3 GND Isolated ground for the hub
4 GND Isolated ground for the hub
5 PDD Power Down Signal to the hub (Digital or 100 Hz of mains zero
crossing signal).
6 Service/Event Event notification pin, output from the meter micro controller.
7 CTS/Meter Busy Signal from meter to the hub for communication traffic control.
Signals are configurable through firmware.
8 3.3 V 3.3 V from the hub
9 Rx Receive signal from the meter micro controller.
10 Tx Transmit signal to the meter micro controller.
Note PLC Two contacts are provided as standard to interface Base Meter
with Hub for future PLC variants
Table 5: Functions of hub interface connector PINs
6.3 Replacing the Communication Hub and Fitting a SIM card
The hub is mounted inside the communication module and is connected to the meter by a 10-pin interface
connector. The hub can be replaced without interrupting the power supply to the electricity meter. To replace the
hub:
1. Break seals and unscrew the two screws on the hub cover.
2. Hold and gently pull the hub cover forwards to separate it from the meter’s 10-pin socket.
3. Replacement of the hub is the reverse of the above process.
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