Once we plugged in a USB3 adapter card the problem went away. These adapters appear to Windows 7, bit as COM ports. Sign up or log in Sign up using Google. Questions Tags Users Badges Unanswered. Windows arbitrarily assigns COM port numbers whenever an FTDI FT part is connected, regardless of whether or not it’s previously seen that particular individual device. Sign up using Email and Password.
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It’s not a hardware issue.
The adapters are powered via the USB bus with only the transmit, receive and ground pins interconnected dlp usb232m the rest of the PCB. You can’t rely on a USB com port always having the same com port number. This behavior has only started dlp usb232m.
Windows arbitrarily assigns COM port numbers whenever an FTDI FT part is connected, regardless dlp usb232m whether or not it’s previously seen that dlp usb232m individual device. These adapters appear to Windows 7, bit as COM ports.
Also, I’m using standard Windows serial port functions and not the D2xx libraries right now so changing over might be a bit painful. Sign up using Email and Password. dlp usb232m
DLP-USBM-G – FTDI – DLPUSBMG – datasheet
The FTDI drivers dlp usb232m track device serial numbers to try ubs232m reassign the same port numbers, check out the Windows registry for a listing. Sign up or log in Sign up using Google.
I’m trying dlp usb232m figure out what would cause that behavior. Intermittently on powering up the system the COM port assignment of one of the boards dlp usb232m change. It seems the most likely culprit is a grounding issue since the port change mostly happens during power up and that’s one of the very few electrical connections between the adapter and the rest of the board. Post as a guest Name. The cables are good, the drivers are up to date and the interconnects follow the manufacturers reference design.
Once we plugged in dlp usb232m USB3 adapter card the problem went away.
DLP DESIGN INC USB to UART Module, DLP-USB232M-G
Questions Tags Users Badges Unanswered. We’ve done some more investigation but have never been able to pin down a “smoking gun” for the root cause.