FUTABA T18MZ WC Instruction Manual page 109

Next explanation is required when using two or more the same kind of sensors.
It is a case where a sensor is registered manually here.
This item is unnecessary if "Sensor unit registration" is performed.
Sensor unit ID setting
ID of the sensor registered into each slot can be changed manually.
Alternatively, registration of the sensor may be accomplished through
the sensor unit registration function which follows.(ID is inputted
automatically)
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