DJI A2 - Manual (Page 53)

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Controller Unit, unmapped. Gimbal functions in Assistant Software, then
the F3/F2 are used for gimbal control; even
D3/D2 are mapped to channels of Receiver,
and the signals from the mapped Receiver
channels will be ignored.
You can use F4 for switching the video
channel of iOSD Mark II, then map D4 to a
Receiver channel.
IOC IOC function of the Controller Unit,
unmapped.
Click “Unmapped” button to map IOC to a
Receiver channel. It is recommended to use a
3-position switch channel.
Go Home One-Key Go Home function of the
Controller Unit, unmapped.
Click “Unmapped” button to map Go Home to
the Receiver channel. It is recommended to
use a 2-position switch channel.
Gear Intelligent Gear function of the Controller
Unit, unmapped.
If you enable the Gear function in Assistant
Software, then the F1 is used for the gear
control of S800 EVO landing.
H3-2D/3D H3-2D/3D function of the Controller Unit,
unmapped.
Click “Unmapped” button to map H3-2D/3D
to a Receiver channel. It is recommended to
use a Knob switch channel, which is only used
for H3-2D/3D pitch control.
H-Fence(Home
Fence)
Unmapped Click “Unmapped” button to map Home
Fence onto the Receiver channel. It is
recommended to use a 2-position switch
channel.
CC (Cruise
Control)
Unmapped Click “Unmapped” button to map Cruise
Control to the Receiver channel. It is
recommended to use a 3-position switch
channel.
The Pitch and the H3-2D/3D channels can be used at the same time. The Pitch is for the pitch
control of servo gimbal, and the H3-2D/3D is for the pitch control of H3-2D/3D gimbal