Ruben J=F6nsson <ruben@pp.sbbs.se> wrote:
> Hi,
>
> I have used the multimedia timer to get better resolution than 55
> ms. My case
> was transmitting on a half duplex RS485 line and I did the
> turnaround with the
> DTR signal. Calculating the time it would take to transmitt and set
> the
> multimedia timer to this time, when fired switched to receiving with
> the DTR.

Ok! I remember the use of APIs, for example this:
Public Declare Sub Sleep Lib "kernel32" (ByVal dwMilliseconds As Long)
   Sleep (1)
This will work on XP as well.

>
> Still, I had to set a delay for about 60ms before the receiving
> microprocessor
> could safely reply with it's packet. This was needed to work on W98,
> 100MHz 486
> computers.

I've thought exactly the same!

> Another option would be to make a hardware switch. Set to TX when
> the PC speaks
> and back to RX when it has been silent some time (9 bits if TXing
> 0x00 (or is
> it 0xff?)).

I like this one. Regarding what Alan said, I wont rely on Wplatforms.
Anyway I have to cosider the reed switch velocity:
Operate Time 0.5msec Max.
Release Time 0.1msec Max.



Thanks
Dennis Crawley
www.geocities.com/proyectosenpic






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