when connecting the remote to the mission planner via usb, mp does not see more than 8 ch

when connecting the remote to the mission planner via usb, mp does not see more than 8 ch. I use radiomaster tx12 mk2

………….

What receiver?

without receiver, remote → usb → mission planner

joysticks only support 8 analog channels. the rest run as switches.

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Right, sorry. Your post was clear I missed the context. I use that radio for joystick function but never needed more channels.

Please tell me where in the mission planner you can configure the operation of 8 analog channels + switches

https://ardupilot.org/copter/docs/common-joystick.html