MSComm with DTREnable
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Hi experts, I have a problem about the MSComm work with RS485 serial port communication. The problem is that I can't detect the end of output to change the flag "DTREnable" from False to True. I have tried the OnComm event "comEvSend" by set the SThreshold=1, the DTREnable flag can't remain False until the end of the output. Also the OutBufferCount value always zero. Please suggest the work method, thx Jolly