[Sending a data packet from PC to serial port in VB]

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Hello Guys,

I need some code sample to send the data packet to serial port from PC (vb program). I am looking for some sample code for this and How to frame the packet in the code to send it serially...My packet format is like this: [Type+Opcode+Parameter+CheckSum]

Please help!. Thanks

What I have tried:

I tried to send some commands (AT commands for bluetooth module), and its working well while sending to serial port. But I dont know how to frame a packet and send it to serial port.

Posted 1-Dec-16 22:58pm

Member 12882844

Updated 2-Dec-16 0:24am

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[no name] 2-Dec-16 5:31am

Such a common question. Have you Googled it? Just Google "Sending a data packet from PC to serial port in VB".

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OriginalGriff · Answer 1 · 2016-12-01T23:56:00

Start here: SerialPort.Write Method (Byte[], Int32, Int32) (System.IO.Ports)[^] - that's the method you probably need to use.
And it's trivial to do:

C#

string parameter = "My parameter";
byte[] paramData = Encoding.UTF8.GetBytes(parameter);
int paramLen = paramData.Length;
byte[] data = new byte[1 + 1 + paramLen + 1];
data[0] = type;
data[1] = opcode;
Array.Copy(parameter.ToCharArray(), 0, data, 2, paramLen);
data[paramLen] = GetCheckSum(data);
myPort.Write(data, 0, data.Length);

Patrice T · Answer 2 · 2016-12-02T00:24:00

Quote:
But I don't know how to frame a packet and send it to serial port.

You can consider that every single AT command you have already send is a frame.
Your frame is simply a string containing what you want, an AT command or [Type+Opcode+Parameter+CheckSum].
you just have to make sure that the string is made of 8 bits chars and will not get encoded as utf 8 if you have some special chars.

[Sending a data packet from PC to serial port in VB]

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