Sonar MB1240 is unable in the Pixhawk 4 operations

ArduCopter Copter 3.6
1

Hi ,I use original Pixhawk4 at present, the firmware edition am 3.6.10, uses the Sonar is MB1240 carries on the connection by I2C A port , and makes the hypothesis according to the official method, changes RNGFND_MAX_CM = “700” and RNGFND_TYPE = “2” two parameters in Mission Planner, but the sonarange value still is 0, ask whether I do have the omission important step? Please help me, thanks you.

Reference article: http://ardupilot.org/copter/docs/common-rangefinder-maxbotixi2c.html

2

Hello.
Have you solved this problem?
I use MB1240 and pixhawk tube black.
I connected MB1240 to ADC3.3 port, set type to Analog, and got result