Unable to open COM port: usbmodem1421

Ground Control Software APM Planner 2.0
1

i install the APM planner 2.0 on my mac os 10.11.2, according to the guide ,i installed the USB driver(FTDIUSBSerialDriver_10_4_10_5_10_6_10_7.pkg) first, then i got the planner installed, but when i plug in the APM 2.8 board, and tried to install the firmware for it, i got the error “Unable to open COM port: usbmodem1421”, and the usbmodem 1421 is the only available option that i can choose.
[attachment=0]Screen Shot 2015-12-30 at 9.27.46 PM.png[/attachment]

have no idea how to get it work on my laptop. questions:

  1. how to check the USB driver is installed correctly?
2

Had the same problem when I used the provided USB drivers as they do what they say but only up to 10.7.
Bill has posted a USB connection link at the top of the forum list.
Follow the guide to uninstall the old drivers and install the newer virtual com drivers
http://www.ftdichip.com/Support/Documents/AppNotes/AN_134_FTDI_Drivers_Installation_Guide_for_MAC_OSX.pdf

3

[quote=“mboland”]Had the same problem when I used the provided USB drivers as they do what they say but only up to 10.7.
Bill has posted a USB connection link at the top of the forum list.
Follow the guide to uninstall the old drivers and install the newer virtual com drivers
http://www.ftdichip.com/Support/Documents/AppNotes/AN_134_FTDI_Drivers_Installation_Guide_for_MAC_OSX.pdf[/quote]

Thanks for this information. I’ve also got this problem and followed the documentation but no matter what I do, I can’t get APM 2 to connect with my APM via USB. It recognises the board but thinks it’s an Arduino Mega 2560. Is this correct ?

I’ve attached a screenshot of what I’m seeing.

Any help coming, pulling what little hair I have left out :wink:

4

Yes, it sees it as an Arduino Mega