On Tue, Sep 19, 2017 at 3:15 AM Brian White <[email protected]> wrote:
> Junky no-name prolific-based ones aren't as good as ftdi-based ones, but > the differences don't show up with a device that runs as slow as this. > I use them with win7 64bit and linux with no problem. > > Well on linux prolific is fine. The problem is the windows driver for prolific. But on Windows I have definitely had problems with TSDOS and other clients. The driver is not configurable to remove significant delays that can trip up, in particular, old software that was developed before USB serial adapters existed. The problem is that USB is packet based and rs232 is character based. USB drivers can choose to batch up multiple characters into a single USB packet in a way that a hardware serial port does not. The ftdi driver on Windows has lots of knobs to turn to reduce this latency. Anyway just want to establish that it's a real problem that I've seen debugging serial communication. -- John.
