Basecam with px4

Good morning,
I use a BaseCam SimpleBGC 32-bit Extended.
I am connected to the Tx, Rx and ground of the card to autopilot in modem 2.
I would like to be able to control the camera with a joystick the yaw and the pitch. At the moment this is not working. The joystick works because I can start the engines. The pitch control and yaw on the joystick are adjusted
My settings on PX4 autopilot
MNT_MODE_IN MAVLINK GIMBAL PROTOCOL v2
MNT_MODE_OUT MAVLINK GIMBAL PROTOCOL v2
MAV_2_CONFIG TELEM2
MAV_2_NORMAL MODE
SER_TEL2_BAUD 115200
MAV_2_RATE 115200B/S
MNT_MAV 1
MNT_COMP_ID 154

settings on the basecam side
Is it necessary to regulate some things on external IMU? in mavlink connection?