Re: Response not in que?

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#6454

From: Neil P.
Date: Mon, 09 May 2005 20:31

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I use ClearCommError(hComm, &dwErrorMask, & Comstat)

to view what is coming in the cbInQue,

Once, I detect there is something in the que, I
use ReadFile(hComm, inbuff, nBytes, &nBytesRead, &overlapped), I am in this
routine upto 2 times the amount of bytes coming in, using my baudrate 9600.
So I beleive there is plenty of time so that byte can be placed in the que
buffer.

If the unit sending the byte responds ( in a millisecond), then how long is
it before Windows reports to the ClearCommError or to the struct_COMSTAT
that there is a byte waiting?  Does Windows take more than a second to place
it on the que?

By the way the unit is always responding with one byte, because is the
response of what I am sending it.

Thank you,
Neil P.

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