The skytraq EVBs (direct from skytraq) all use the SiLabs chip - you cannot plug more than one in at a time under XP. It won't enumerate the second as a com port and it confuses everything. On Mar 23, 2012 11:25 PM, "Ron Frazier (NTP)" < timekeepingntplist@c3energy.com> wrote: > Hi all, > > I just discovered an interesting thing about the Sure board's serial - USB > converter. I went ahead and installed the driver. With this serial - USB > converter, which is a Silicon Labs CP210x chipset, no matter which USB port > I plug it into, it becomes COM6, which was the next one available. With > the Prolific based devices, including the TU-S9 and the BU-353, each > subsequent USB port I plug into becomes a new com port, so those devices > became COM3, COM4, and COM5 respectively as I plugged them into succeeding > USB ports. I can see pros and cons either way. > > With the Prolific way, if I move the device to a different port, I have to > have a different setup in the ntp.conf file, although you could probably > have multiple setups, and if nothing is attached to a given port, then it > gets ignored. > > With the Silicon Labs way, I only have to have one set of configuration > options in ntp.conf. However, what happens if I plug in another device > with the same chipset? I'm assuming the next one will become COM7. But, > now, if I unplug both and plug them back into the same ports, but in the > opposite sequence, I'll bet the original 1st device will now be COM7 and > the original 2nd device will be COM6. I can see how this would cause some > problems. > > I have not tested yet whether this board's USB port has a built in driver > in Linux. > > Sincerely, > > Ron > > > > -- > > (PS - If you email me and don't get a quick response, don't be concerned. > I get about 300 emails per day from alternate energy mailing lists and > such. I don't always see new messages very quickly. If you need a > reply and have not heard from me in 1 - 2 weeks, send your message again.) > > Ron Frazier > timekeepingdude AT c3energy.com > > ______________________________**_________________ > Thumbgps-devel mailing list > Thumbgps-devel@lists.**bufferbloat.net > https://lists.bufferbloat.net/**listinfo/thumbgps-devel >