On Wed, Sep 4, 2019 at 08:35 AM, Rune Broberg wrote:
it is a USB serial port, and I'm happily
running it at 115200 in my software with few problems. There is the
occasional single-bit/byte transmission error
TLDR: The USB driver negotiates the speed, higher speeds are fine.
The speed which you set for NanoVNA COM port doesn't matter. The speed value is just not used. No matter what speed you choose, it always communication at maximum speed. :)
If you have trouble with occasional transmission error. Try this firmware, it should solve your issue:
It also has scanraw command, it allows to perform measurement for unlimited amount of points, and with using average up to 1000x. But it returns raw measured values, with no calibration apply. So, you're needs to apply your own calibration to the result.
For example this command will return you S11 measurement (with no calibration apply) from 50 kHz to 10.050 MHz with 1 kHz step (10000 points) and with 5x average:
scanraw 0 50000 1000 10000 5
where
0 - channel CH0
50000 - start frequency
1000 - frequency step
10000 - needed point count
5 - average times
