Il giorno 10 nov 2020, alle ore 02:44, Jim Unroe <rock.unroe@gmail.com> ha scritto:

The above ( /dev/cu.usbserial ) indicates that you have a programming
cable with a Prolific type USB-to-Serial chip. Genuine Prolific chips
are very rare in programming cable so the likelihood of your chip
being an unauthorized copy is very high. In that case you need to
purchase and use a 3rd party device driver. This is the one I bought
and installed on my macBook Air to use with my large variety of
programming cables with a "Prolific" chip.

https://www.mac-usb-serial.com/

Jim KC9HI

Ah, interesting. I was taking for granted that driver-wise I was fine since I could download from the radio and I already installed the following ones as suggested in other discussions I read:
- PL2303_MacOSX_v1.6.4_20200911.zip from http://www.prolific.com.tw/US/supportDownload.aspx?FileType=56&FileID=133&pcid=85&Page=0 (I also tried PL2303HXD_G_Driver_v2_0_0_20191204.zip from http://www.prolific.com.tw/US/ShowProduct.aspx?p_id=229&pcid=41 with similar results)
- RTSystemsMacDriversV24.zip from http://www.rtsystems.us/drivers/

In case it may shed more light, the attachment shows the response of the “Serial Detect” app from mac-usb-serial.com.

I will give a try to their driver and report back. Apparently with the Sunday sale.

Thanks again,

Giulio
IU0BMW