[GreenKeys] Serial port FIFO issues

Jeffrey D Angus jangus at socal.rr.com
Wed Jun 3 12:42:54 EDT 2009


John Nagle wrote:
>      That's an operating system configuration issue.  You need to turn off
> the input and output FIFOs for very slow serial ports.  There's a built-in
> accumulation timer with an accumulation time of 4 character times in most
> serial ports.  For most baud rates, nobody notices, but at 45.45 baud,
> that's more than half a second.  It's a Windows control panel option.
>
>      This matters mostly if you're operating a Teletype in full-duplex
> mode, with the computer doing the echoing.

Thanks John, I'll give that a try this afternoon when I get into the shop.

Jeff-1.0
wa6fwi

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