I been having trouble getting my apm1 to connect with the MP. Just upgraded to 1.1.75 this am but I'm still having this issue. However I've found that with 1.1.75 if I "wake up" the apm with the terminal mode, MP with then connect in the normal way in the other modes. This issue cropped up after 1.1.71 which was connecting OK and has been a problem on an off since 1.1.50.
What's going on here?? Am I missing something?? Or is this an issue with my apm?? BTW: I have unchecked the "reset apm on connect" box in MP setup to no avail....
please try ticking the reset on apm connect button again, this enabled should mirror what happen on ther terminal screen.
will give it try Michael
I am having what may be a similar problem with an APM2. I have previously used this with Arduplane and and now trying to build a jDrones hexa. I am running windows 7 (64 bit) and APM Planner 1.1.75 mav 0.9 For some reason I get in an update loop when I start the program but get into it just by clicking no on update). I have been able (I think) to install the Adrucopter hexa V2.5.4 firmware - the dialog goes fine RX TX lights blink at the appropriate spots etc. When I then try and connect after completing the update it fails to detect a heartbeat. If I go to terminal then when I hit return the RX light blinks. All I get in the terminal window is "I?" every time I hit return. Tried unchecking reset apm on uSB in planner setup. I don't have the "set RTS on close" checkbox in the Arduino Mega 2560 cOM port that shows up in windows control panel.
I was able to fix the update loop by downloading the zip file (I had used 64 bit MSI). I got access to the "set RTS on close" checkbox by changing to the FTDI driver - it had been using Arduino. The effect of this was I can not communicate with the APM2 at all. Switching to terminal results in "can't open serial port"
Try rebooting your PC.
Also, did you set the baud rate to 115k?