10/8/2019 Serial Usb Connection Troubleshoot
The USB to Serial Cable is still not working after installing the driver properly. The device manager shows the COM port number assigned to the adapter cable. In some computers or laptops the USB–to-serial adapter cable won’t work even though everything appears to have installed correctly. This is due to the fact that computers will.
Here are some troubleshooting steps for common installation and setup problems.
Failure to connect to device
Probably the most common problem is a failure to connect to the Azure Sphere device. This problem can occur for many reasons and may trigger any of several error messages, depending on which tools or applications encounter it. The following error messages may indicate a failed connection:
Failure to connect may occur for any of these reasons:
To resolve the problem, start with these basic steps:
If none of these steps solves the problem, try the solutions that follow.
Check the power to the board
If the MT3620 board appears 'dead' or unresponsive, the problem could be a lack of power.
Make sure that the real-time clock (RTC) is powered, by either the main 3V3 power supply or a coin cell battery, as described in the MT3620 development board user guide.
MT3620 development boards are shipped from the factory with a jumper header across pins 2 and 3 of J3, which powers the clock from the main power supply. Check that the header has not been dislodged or removed.
Check the TAP-Windows adapter configuration
Azure Sphere tools communicate with attached development boards by using an IP network over USB. This requires the TAP-Windows adapter from OpenVPN Technologies. The Azure Sphere SDK installation procedure installs this adapter on your PC if it is not already present.
However, if a different version of the TAP-Windows adapter is already installed, or if the Azure Sphere device is not connected to the first instance of the TAP-Windows adapter, the Azure Sphere tools may fail to connect to your device.
To determine whether the problem is related to the TAP adapter, first find out how many TAP adapters are installed on your PC, and then modify the installation if necessary.
To determine how many TAP adapters are installed on your PC:
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To uninstall the TAP adapters:
Serial Usb Connection Troubleshoot Problems
Failure to create three COM Ports
After you set up an MT3620 development board, you should see three COM ports in Device Manager. If you see only one or two, as in the following screenshot, you may have a problem with the FTDI driver:
To resolve this problem:
USB errors
If the following error occurs after you attach an MT3620 development board, you may have a USB error:
Windows has stopped this device because it has reported problems. (Code 43) A USB port reset request failed.
To resolve this error, try these steps:
Usb Connection Psp Downloads
PC drops connection to Azure Sphere
If your PC can connect to the Azure Sphere device, but often drops the connection, you may have a conflict in the IP subnet.
Motorola Usb Connection
Azure Sphere uses subnet 192.168.35.*. If you have other software that uses the same subnet, either disable that software or limit the range of IP addresses that it uses.
Usb Connection Troubleshooting
Currently, you cannot change the range of IP addresses that Azure Sphere uses.
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