SerialPort write, flush

Question

Hi,

I've noticed that the System.IO.Ports.SerialPort class sends data if and only if the write buffer inside the class is full. I'd like to know whether there is a way of flushing the buffer immediately after Write. My application sends just a few bytes of data and I need my connected device to be able to react as soon as possible. I tried using SerialPort.BaseStream.Flush but had no luck, I always receive chunks 2048 bytes long.

I use Visual Basic 2005 Express.

Thanks in advance

Answer 1

i use 2008 and have not noticed that to be the case.  check writetimeout.  set it to 1 and see if that helps, or leads you somewhere else.

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dewayne the pain

Answer 2

Hi Eosie,

Please look through this excellent document:
http://www.innovatic.dk/knowledg/SerialCOM/SerialCOM.htm
Serial COM Port Communication with Visual Basic .NET

Thank you dbasnett for your friendly help. :-)

Best regards,
Martin Xie