Connect the RJ45 cable between the two modules. Connect the 8-pin JST cable to module 1 and wire the other end to the MCU's data pins (and power/gnd if needed), and ensure RE and DE are pulled high (DIP switches in the OFF setting). Connect the 12V and GND from your power source to the VIN/GND pins on module 1. The two modules will be connected through a 15 meter AWG26 RJ45 cable, and we'll assume there's a 12V power source near module 1. 
The other device will act as the receiver, and will be a short string of WS2812 LEDs drawing 200mA of current at 5V (1W). Let's assume one device acts as the driver, and will be connected to an MCU (microcontroller, ex: Arduino).
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