COM port and RTS_CONTROL_TOGGLE - Programmers Heaven

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I'm quite new in windows programming, so maybe it is not a problem for most of you.

I want to use COM1 RTS line to drive some circuit, but only when data are ready to transmite. I need RTS to be set very short before data are transmited and cleared just after last stop bit is shifted out from TxD line. I thought that setting fRtsControl to RTS_CONTROL_TOGGLE in DCB struct passed to SetCommState will handle this, but RTS stays active no mather if TxD is clear or is sending data. I thought it will be active ONLY if TxD is sending data. Can any one help me with setting RTS to toggle? (or in other way)

Tomasz Sztejka.

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