On 7/6/21 9:15 PM, Anne Ranch wrote:
Thanks, sure explains few things.
As I just posted elsewhere, I am ignorant about my toy version.
( And I am NOT taking it apart to find out... and I was just kidding about taking Polaroid of screen flash )
I am currently working on my version of bluetooth access to FT857 CAT and I am painfully aware
how "screw up" any communication with PC can get.
As far as USB - that is how it supposedly work - the USB device supposedly
announce himself to the USB bus AFTER it gets thru its power-up.
And if the USB bus , hence booting PC in this case, is not ready for it ...who knows what will happen next.
In short - USB (standard) starts communication FROM USB device to whatever , not from whatever to USB device...
Bluetooth is even messier.
When your PC boots it should re-enumerate all the USB devices. In Windows, you can force this in device manager (and there used to be a command line technique, as well, but I don't know if it exists in Win 10. It probably does, but some googling will be required to find it)
The unit shows up as a com port and unless you're unlucky, you can probably figure out *which* com port by looking at the VID and PID of the USB device (or by unplugging and replugging, and seeing which com port disappears and reappears)
As far as USB devices go, the NanoVNA has been pretty good.
