Microham USB III not showing the list of CAT serial ports

[HZ1YR]

In the very old version of RUMlog, my Microham USB III was working perfectly. Forward 6 years from then, I just downloaded RUMlogNG 4.6 on Mac OS 10.15.4 but unfortunately, I can't have it communicate with my transceiver (Kenwood TS-480) through the Microham USB III interface.

My settings are as per the following screenshot, however, the problem is in the Serial port list; It does not show any serial port although my device is detected in my System Profiler.


Serial port list:


System Profiler

[DL2RUM]

When you see it in the System profiler but not in the port list, then you don't have installed the proper FTDI driver.
Normally FTDI chips work with he default Apple driver, but not very old chips.

[HZ1YR]

Thanks for the prompt and informative reply. The thing is, my MacBook Pro is not very old. It is a 2016 model. Is there a way to reinstall the FTDI driver?
I have downloaded the FTDIUSBSerialDriver_v2_4_2.dmg from Microham's website and installed it, but nothing changed. I even tried restarting the machine with no luck.

Any suggestions or what options do I have or can try?

[DL2RUM]

This driver should be okay. Maybe this helps: https://developer.apple.com/library/arc ... index.html

[HZ1YR]

Although the system never prompted me to approve the KEXT but maybe because I already had the option selected to allow apps from the App Store and identified developers?

However, I found the following: (I'm not a developer by any means )

Code: Select all

$ kextfind | grep -i ftdi
/Library/Extensions/FTDIUSBSerialDriver.kext
/System/Library/DriverExtensions/com.apple.DriverKit-AppleUSBFTDI.dext

Does having both mean they are conflicting somehow?

[HZ1YR]

After trying further, I tried loading the kext manually as following:

Code: Select all

$ sudo kextutil -v 3 /Library/Extensions/FTDIUSBSerialDriver.kext
Defaulting to kernel file '/System/Library/Kernels/kernel'
Reading loaded kext info from kernel.
Untrusted kexts are not allowed
Kext with invalid signature (-2147409652) denied: /Library/StagedExtensions/Library/Extensions/33A95561-2A24-451C-832B-38141A53E037.kext
Bundle (/Library/Extensions/FTDIUSBSerialDriver.kext) failed to validate, deleting: /Library/StagedExtensions/Library/Extensions/33A95561-2A24-451C-832B-38141A53E037.kext
Unable to stage kext (/Library/Extensions/FTDIUSBSerialDriver.kext) to secure location.

[DL2RUM]

Do you have checked your security settings?

[HZ1YR]

Do you have checked your security settings?

Yes, I have.

I managed to solve it now. As suspected, the Apple default system KEXT is somehow conflicting with the FTDI KEXT I installed. The solution was to install the D2xxHelper as per the guide https://www.ftdichip.com/Support/Docume ... AC_OSX.pdf

Now the USB interface is listed under the CAT serial ports


However, I have another problem now that I still can't figure out what is causing it. Whenever I start RUMlogNG, my transceiver seems like it is transmitting and it doesn't stop until I quit RUMlogNG. The app follows my transceiver's frequency correctly but seems like it is in TX mode!

[DL2RUM]

I can't see your flow control settings in the screenshot. It seems you use any kind of flow control and your trx is configured to use DTR or RTS for CW or PTT keying.

[HZ1YR]

Here is the screenshot


I unchecked the RTS/CTS and DTR/DSR in Flow control and it worked! Although I'm not sure if this is how it is supposed to be.