> Am Dienstag, 26. Dezember 2006 18:57 schrieb Marco van de Voort: > > > The best USB-serial Interfaces for Linux are the ones with FTDI Chip > > > inside. http://www.ftdichip.com/ > > > http://www.ftdichip.com/Products/EvaluationKits/USB-Serial.htm > > > > Do they have the same latency as a normal serial port? I've tried several > > usb-serial ports, and they all have horrible latencies compared to an > > onboard (or PCI card). > > > For me the latency is not (very) important. I do not feel a lack of latency. > We tried USB converters with prolific chipset and it hangs up then, so FTDI > chips would be better. I read also somewhere a lack of latency. May be it is > also a question of the Kerneldriver and the driver will improve more in the > future.
We mostly use a serial (either using a RS422 converter or straight) to contact a PIC for the realtime part of our applications. The latency is also there under Windows, and messes up the realtime aspect of signaling. (actually, while I used the converters under Linux, I haven't latency benchmarked them yet) _______________________________________________ fpc-pascal maillist - fpc-pascal@lists.freepascal.org http://lists.freepascal.org/mailman/listinfo/fpc-pascal
