Camera Gimbal Settings Greyed Out

Hello,
I cannot get the camera gimbal screen in mission planner to work. It’s greyed out but I need it to configure the camera.

I am working on a hexacopter with 14" props and trying to get the camera underneath to trigger. I am helping my engineering professor get this older drone up and working again. It is using an older PixHawk from around 2013. Here is some more info:
Frame: HEXA/X
IMU0: fast sampling enabled 8.0kHz/1.0kHz
RCOut: PWM:1-14
IOMCU: 420 1001 411FC231
fmuv2 002E001C 35324718 36343032
ChibiOS: 6a85082c
ArduCopter V4.5.7 (2a3dc4b7)

I am following the ArduPilot documentation with a Canon SX260HS:
https://ardupilot.org/copter/docs/common-pixhawk-camera-trigger-setup.html

Here’s my issue: the camera gimbal options are all greyed out.

I need to set the shutter on the camera gimbal screen but cannot. Any help would be appreciated! Attached is my full parameter list. The drone does fly currently.
full para list for forum.param (16.3 KB)

Use the Full Parameter List.

Dave,

Thank you so much for your time. I am having difficulty getting this to work with the full parameter list.

My camera focuses when 5V is applied to it shutter cable, and takes the photo on the falling edge when the 5V is removed. I know this works because I have just tested it with a 5V power supply.

I have connected the camera to aux1 on the pixhawk. The following parameters have been set:

CAM1_TYPE = 2 to set the trigger as a relay (as opposed to a servo)
SERVO9_FUNCTION = -1 to set this as a GPIO pin. I originally had this set to ‘CameraTrigger’ but received an error in the HUD saying “PreArm: RELAY1_PIN = 50, set SERVO9_FUNCTION = -1” (see photo)

RELAY1_PIN = 50 - sets digital pin number for relay control to AUX1

When I go to the data screen and right click on the map, and hit ‘Trigger Camera NOW’ the voltage jumps to 4.2v for a moment, then 2.3 for the remaining time. (measured using a multimeter)

So basically, it seems like it’s working but not reaching the full 5 volts to trigger the camera. Any ideas?

Output is 3.3V so you are right it won’t trigger a 5v input. You could add a relay with a 3.3v coil to do that if you have a 5v source on the contact.