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Perform SDI-12 wiring in the transmitter as described in Power management.
Make sure you combine the 2 "Data in/out" wires of each transmitter either in the internal screw terminal inside or outside the transmitter.
- In the data logger end, combine the "GND for data" wires of each transmitter to the logger "GND for data" wire. Connect the "Data in/out" wires of each transmitter to the logger "Data" wire.