NEX NEM20 Power Meter
- Patrick Wrafter
The installation steps must be performed by a qualified electrician.
Installation
The NEM20 meter has three major components to be wired into it:
Three phase voltage
Phase A, Phase B, Phase C and a neutral line should all be wired into the NEM20 meter. This should be wired in wherever you would like to monitor the voltage from.
Communication bus
The NEM20 supports Modbus RS-485 communications. The data positive, data negative, and shield should be daisy chained into and out of the communication terminals.
CT Chains
The NEM20 has three RJ12 terminals - out of these you can daisy chain a string of it's special split core CTs.
Communication
Once the Communication bus has been wired in, you can enable Communications to the device by properly configuring its Modbus settings. The two settings you will need to change are the Baud Rate, and the Modbus Address. Set these to be compatible with the settings the NEX has been configured with. Generally, the NEX controllers will be set for 9600 Baud Rate.
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