OpenTX Reference Guide 22 Trainer
The Trainer Mode is set in the Trainer Port parameters on the Model Setup screen. It is set to either Master or Slave.
When the Trainer Mode is Master, the following parameters apply.
The multiplier value scales all of the channels by the same value.
Range is from 0.0 to 5.0. Default is 1.0.
When the Trainer mode is Slave, this screen simply shows the message Slave. No set up is required here, however refer to the Model Setup screen Trainer Port parameters for slave setup.
A stereo cable with 3.5mm plugs on each end is suitable as a trainer cable.