Once upon a time, Brian Utterback <[EMAIL PROTECTED]> said: >So, apparently not entirely useless. Using USB as a power source is >getting to be highly popular. Witness the number of cup warmers, fan, >etc. on the market. As long as you don't try to read the signal via >USB, it should be okay.
Another power source solution (especially for those like me that don't have an open RS232 port anyway) is the SIIG series of PCI/PCI-E RS232 cards; they can optionally provide +5V or +12V on a pin. >One thought occurs to me. Would it work to have the PPS signal go to a >serial port but the actual NMEA sentences be read via USB? It seems to >me if the total jitter of the USB still kept the snetences timing >within half a second it would work. I am actually doing that right now (using the parallel port instead of the serial port in my case); it works fine. Has anyone tried isochronous mode USB to see if that helps with the latency? I have an FTDI USB-to-RS232 interface that supports isochronous mode, but I haven't had a chance to try it. -- Chris Adams <[EMAIL PROTECTED]> Systems and Network Administrator - HiWAAY Internet Services I don't speak for anybody but myself - that's enough trouble. _______________________________________________ questions mailing list [email protected] https://lists.ntp.org/mailman/listinfo/questions
