Spektrum MR200 Guide De L'utilisateur page 5

You must bind the MR200 receiver to the transmitter before it will operate.
Binding is the process of teaching the receiver the specific code of the transmitter
so it will only connect to that specific transmitter.
1. To bind an MR200 to a compatible transmitter, insert the bind plug in the
BND/BAT port on the receiver.
2. Power the receiver through any open port. The LED on the receiver should be
flashing, indicating the receiver is in bind mode and ready to be bound to the
transmitter.
Note: To bind a boat with an electronic speed controller that powers the
receiver through the throttle channel (ESC/BEC), insert the bind plug into
the BND port in the receiver and the throttle lead into the throttle (THR)
ports.
3. Move the steering wheel and throttle on a surface transmitter and the sticks
on an aircraft transmitter to the desired failsafe positions, generally low throttle
and neutral steering positions. See the failsafe section for more information
about failsafe.
EN