I am trying to connect my 915Mhz 3DR radio to my pixhawk using the ardupilot mission planner, but I am having trouble getting the radios to talk to one another. I set the Baud rate to 57600 as stated,but then I get an error message saying the device max baud rate is 22395. When I set the baud rate to 22395 I get a 30 second timer after which I get a message saying no heartbeat detected. I am unsure why I get the 'max baud rate = 22395' message as the radio is the one that came with the pixhawk and the driver for the radio is set for a max bit rate of 115200. I have attached photos that may help.
Any help would be appreciated.