[time-nuts] USB Serial ports, was Re: LTE-Lite

davidh dhooke at gmail.com
Fri Nov 28 22:46:33 EST 2014



Hi,

For Windows, ComPortMan does a great job of managing comm port 
assignments. Available at <http://www.uwe-sieber.de/comportman_e.html>

Cheers,

david

On 29/11/2014 9:42 AM, Hal Murray wrote:
>
> kb8tq-WYFaD0z3Idg at public.gmane.org said:
>> The “new chip ID, new com port” thing is pretty typical for the FTDI
>> drivers. If you plug the old LTE back in there’s a good chance it will come
>> back up as COMM 5. Usually they are pretty good about only adding ports for
>> devices they have not seen before.
>
> Most/some of the FTDI usb to serial chips have a serial number.  I don't know
> how it works on Windows, but on Linux, you can use the udev rules to make an
> alias so your software can refer to something with a filename like /dev/LITE
> rather than /dev/ttyUSB2.  It works no matter which slot you plug it into
> and/or still works after it gets unplugged and reconnected.
>
> lsusb -v will show things like:
>    idVendor           0x0403 Future Technology Devices International, Ltd
>    idProduct          0x6001 FT232 USB-Serial (UART) IC
>    bcdDevice            6.00
>    iManufacturer           1 FTDI
>    iProduct                2 FT232R USB UART
>    iSerial                 3 A102GX1N
>
> /var/log/messages or /var/log/syslog will contain something like:
> Nov 28 15:12:00 deb kernel: [1392082.791230] usb 3-3: Product: FT232R USB UART
> Nov 28 15:12:00 deb kernel: [1392082.791235] usb 3-3: Manufacturer: FTDI
> Nov 28 15:12:00 deb kernel: [1392082.791240] usb 3-3: SerialNumber: A102GX1N
> Nov 28 15:12:00 deb kernel: [1392082.799337] ftdi_sio 3-3:1.0: FTDI USB
> Serial Device converter detected
> Nov 28 15:12:00 deb kernel: [1392082.799447] usb 3-3: Detected FT232RL
> ....
> Nov 28 15:12:00 deb kernel: [1392082.805436] usb 3-3: FTDI USB Serial Device
> converter now attached to ttyUSB3
>
>
> This is what I put in /etc/udev/rules.d/35-hgm.rules
>
> # LTE LITE Eval Board
> KERNEL=="ttyUSB*", ATTRS{serial}=="A102GX1N", MODE="0666", SYMLINK+="LITE"
>
>
> I use the same approach with my Rigol scope and Prologic USB-GPIB.
>
>
>
>




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