RTS_CONTROL_TOGGLE

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#4839

From: Roland
Date: Wed, 16 Nov 2005 10:49

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Hi,

I have a problem with the serial communication. I have to program a serial transfer which uses the RTS line to toggle the data direction of an RS485 device. So I need in principe a functionality like described for the DCB structure using RTS_CONTROL_TOGGLE for .fRtsControl. Now according to a ms-bug report (support.microsoft.com/support/kb/articles/Q140/0/30.asp) it doesn't work properly. As next step i tried using WaitCommEvent and its relatives (using EV_TXEMPTY) causing the result, that the process returns in the middle of the transmittion process and not at its end as described:"EV_TXEMPTY The last character in the output buffer was sent."

So I not able to control the RTS line in a suitable way.

Does anybody has a solution for this problem.

Roland

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