> > In Windows98 you can Do ControlPanel->System->DeviceMangaer->Ports and
so
> on
> > to get to the advanced properties for a serial port and switch off the
> FIFO,
> > but probably a serial program can override all these settings. I seem to
> > remember having done that but it will take me some time to find the info
> on
> > MSDN...there is an iocontrol struct you can configure somewhere to use
> > specific hardware handshake lines and possible control the FIFO use.
> > /\/\/\/*=Martin
>
> The logical place would be in the settings in the DCB passed to the WinAPI
> SetCommState, but of course that is not it.
>
> I'm not sure where to look in MSDN for IOCTLs that apply to the serial
> device. I've never bumped into them.

I was using ioctl when I meant dcb. Sorry, wrong OS. I see that in the DCB
there is a field:
"fOutxCtsFlow
Specifies if the CTS (clear-to-send) signal is monitored for output flow
control. If this member is TRUE and CTS is turned off, output is suspended
until CTS is sent again. "...which says nothing about its latency.

I found IOCTL_SERIAL_SET_FIFO_CONTROL in the Driver Development Kit, which
may mean it is hard to use by an application...see:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/serial/hh/s
erial/serref_42b6.asp

/\/\/\/*=Martin

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