public void ModbusFrameWriter_WriteFrame_CorrectlyWritesAReadInputRegistersRequest()
{
// Given
var request = new RequestAdu
{
Header = new Header(transactionID: 1, unitID: 4),
Pdu = new RequestReadInputRegisters
{
Address = 0x0040,
Quantity = 0x000A,
},
};
var arraybuffer = new ArrayBufferWriter <byte>();
// When
var writer = new ModbusFrameWriter(arraybuffer);
var position = writer.WriteFrame(request);
arraybuffer.Advance(position);
// Then
var data = arraybuffer.WrittenSpan.ToArray();
Assert.Equal(
new byte[] { 0x00, 0x01, 0x00, 0x00, 0x00, 0x06, 0x04, 0x04, 0x00, 0x40, 0x00, 0x0A },
data
);
}
public void ModbusFrameWriter_WriteFrame_CorrectlyWritesAWriteSingleCoilRequest()
{
// Given
var request = new RequestAdu
{
Header = new Header(transactionID: 1, unitID: 4),
Pdu = new RequestWriteSingleCoil
{
Address = 0x0041,
CoilState = true,
},
};
var arraybuffer = new ArrayBufferWriter <byte>();
// When
var writer = new ModbusFrameWriter(arraybuffer);
var position = writer.WriteFrame(request);
arraybuffer.Advance(position);
// Then
var data = arraybuffer.WrittenSpan.ToArray();
Assert.Equal(
new byte[] { 0x00, 0x01, 0x00, 0x00, 0x00, 0x06, 0x04, 0x05, 0x00, 0x41, 0xFF, 0x00 },
data
);
}
public void ModbusFrameWriter_WriteFrame_CorrectlyWritesAWriteMultipleCoilsRequest(object request, byte[] expected)
{
// Given
var arraybuffer = new ArrayBufferWriter <byte>();
// When
var writer = new ModbusFrameWriter(arraybuffer);
var position = writer.WriteFrame((RequestAdu)request);
arraybuffer.Advance(position);
// Then
var data = arraybuffer.WrittenSpan.ToArray();
Assert.Equal(expected, data);
}
public async Task <List <bool> > ReadCoils(ushort address, ushort quantity, CancellationToken token = default)
{
ThrowIfDisposed();
ThrowIfNotConnected();
if (token == null)
{
throw new ArgumentNullException(nameof(token));
}
var header = CreateHeader();
var frame = new RequestAdu
{
Header = header,
Pdu = new RequestReadCoils
{
Address = address,
Quantity = quantity,
}
};
var written = _writer.WriteFrame(frame);
_connection.Transport.Output.Advance(written);
var waitForResponse = WaitForResponse <ResponseReadCoils>(frame, token).ConfigureAwait(false);
var flushResult = await _connection.Transport.Output.FlushAsync(token).ConfigureAwait(false);
var response = await waitForResponse;
var bits = new BitArray(response.Coils);
var result = new List <bool>();
for (var i = 0; i < quantity; i++)
{
result.Add(bits[i]);
}
return(result);
}