How to read data from com port

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C#3.5

i use serial data handler but it not fire never

Posted 19-Jan-15 23:37pm

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[no name] 20-Jan-15 5:38am

Can you post a small amount of your code - enough to see how you set up handler.

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OriginalGriff · Accepted Answer · 2015-01-19T23:49:00

First, use the SerialPort class[^] - the link includes an example.
Second, check your com port connection to the device: if it's a "real" COM port rather than a USB connection then some devices require control signals such as RTS/CTS and DTR before they can start to talk.

You also need to check the speed, bits per character, stop bits, and parity are correct, and that the device doesn't need to you "talk first" before it sends any data.

I'd recommend checking the connection first using hyperterminal or similar before moving direct to code with all the possibilities for other mistakes that adds.

Member 8806421 · Accepted Answer · 2015-01-20T16:33:00

Solution 2

C#

port = new SerialPort("POrt Name");
                     port.Open();
                     string message = port.ReadExisting();
                     txtMsg.Text = message;

This works for me.

Posted 20-Jan-15 16:33pm

Member 8806421

Updated 20-Jan-15 17:29pm

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How to read data from com port

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