serial com port communication through scanner using C#

The following comes from my (now stale) OpenStack project on Source Forge.
The SerialPort class has a DataReceived event which you can hook up to. You could either utilize some of the framework in OpenStack and look at what the Modbus LLC is doing or simply iterate through the bytes received in the serialPort.Read() call.

http://sourceforge.net/projects/openstack/

///

/// Callback when data is received from the port

///

/// the event sender

/// the event arguments

private void Port_DataReceived(object sender, SerialDataReceivedEventArgs e)

{

if (this.serialPort.IsOpen == false)

{

return;

}

if (e.EventType == SerialData.Chars)

{

IDataBuffer buffer = this.dataBuffer;

byte[] payload = buffer.FirstSegment.Payload.Data;

int count = Math.Min(this.serialPort.BytesToRead, payload.Length - 1);

count = this.serialPort.Read(payload, 0, count);

if (count > 0)

{

buffer.FirstSegment.StartPosition = 0;

buffer.FirstSegment.Count = count;

// Retrieve a new buffer for the next read before raising the event.

this.dataBuffer = BufferPool.Instance.GetBuffer(this.bufferSize);

// Raise the event with the data buffer we just read in.

this.OnDataReceived(buffer);

}

}

I hope this helps!

Eric

1 Reply

Know the answer? Post it — somebody with the same question will find it here.

Eric Zimmerman12y ago
The following comes from my (now stale) OpenStack project on Source Forge.
The SerialPort class has a DataReceived event which you can hook up to. You could either utilize some of the framework in OpenStack and look at what the Modbus LLC is doing or simply iterate through the bytes received in the serialPort.Read() call.

http://sourceforge.net/projects/openstack/

///
/// Callback when data is received from the port
///
/// the event sender
/// the event arguments
private void Port_DataReceived(object sender, SerialDataReceivedEventArgs e)
{
if (this.serialPort.IsOpen == false)
{
return;
}

if (e.EventType == SerialData.Chars)
{
IDataBuffer buffer = this.dataBuffer;
byte[] payload = buffer.FirstSegment.Payload.Data;

int count = Math.Min(this.serialPort.BytesToRead, payload.Length - 1);
count = this.serialPort.Read(payload, 0, count);

if (count > 0)
{
buffer.FirstSegment.StartPosition = 0;
buffer.FirstSegment.Count = count;

// Retrieve a new buffer for the next read before raising the event.
this.dataBuffer = BufferPool.Instance.GetBuffer(this.bufferSize);

// Raise the event with the data buffer we just read in.
this.OnDataReceived(buffer);
}
}
}

I hope this helps!

Eric