The RX gets power from the ESC.. when you connect the ESC to Throttle cha #1 then it get the 5 volts from the battery VIA the speed controll.. Then when you bind the unit just connect the Channel 1 and put the bind plug in and plug the battery up.. Then the light on the RX should be blinking then push the bind button on the TX and turn it on.. On the DX7 you let go of the bind button.. and it will blink also and then start working.. Should be in your manual.. The connection instructions should be in the manual for the ESC!!

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