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續上篇，接下來，我要實作Modbus TCP 的 Response Protocol ，這個 TcpModbusResponse 類別主要是驗証資料的正確性

如下圖紅框：

 

TcpModbusResponse 實作 AbsModbusResponse 抽像類別：

1. 指派 FunctionCodePosition ，它表示 Function Code 的位置，由下圖得知，Function Code 的索引值是 7。
2. CheckDataValidate 方法，沒有處理任何工作。
3. GetResultArray 方法則是取出結果，例如下圖取出 Coil Status 的結果
   

 

程式碼如下：

{
    private byte _functionCodePosition = 7;

    protected override byte FunctionCodePosition
    {
        get { return _functionCodePosition; }
        set { _functionCodePosition = value; }
    }

    protected override void CheckDataValidate(byte[] ResponseArray)
    {
    }

    protected override byte[] GetResultArray(byte[] ResponseArray)
    {
        //get result data
        var counterPosition = this.FunctionCodePosition + 1;
        var counter = ResponseArray[counterPosition];
        var resultArray = new byte[counter];
        Array.Copy(ResponseArray, counterPosition + 1, resultArray, 0, counter);
        return resultArray;
    }
}

 

---

 

建立單元測試，同樣的我們需要驗証資料處理的正確性，在這裡我用到了驅動測試

下圖為測試檔案。

驅動測試詳細作法請參考：[Visual Studio 2012 ] 建立資料驅動單元測試

 

測試程式碼如下：

[TestMethod()]
[DeploymentItem("TestDoc\\TcpReadFunc1Test.csv")]
[DataSource("Microsoft.VisualStudio.TestTools.DataSource.CSV", "|DataDirectory|\\TestDoc\\TcpReadFunc1Test.csv",
    "TcpReadFunc1Test#csv", DataAccessMethod.Sequential)]
public void ReadCoilsTest()
{
    TcpModbusResponse target = new TcpModbusResponse();

    byte[] RequestArray = _modbusUtility.HexStringToBytes(TestContext.DataRow[0].ToString());
    byte[] ResponseArray = _modbusUtility.HexStringToBytes(TestContext.DataRow[1].ToString());
    byte[] expected = _modbusUtility.HexStringToBytes(TestContext.DataRow[2].ToString());
    var actual = target.ReadCoils(RequestArray, ResponseArray);
    Assert.IsTrue(expected.SequenceEqual(actual));
}

[TestMethod()]
[DeploymentItem("TestDoc\\TcpReadFunc2Test.csv")]
[DataSource("Microsoft.VisualStudio.TestTools.DataSource.CSV", "|DataDirectory|\\TestDoc\\TcpReadFunc2Test.csv",
    "TcpReadFunc2Test#csv", DataAccessMethod.Sequential)]
public void ReadDiscreteInputsTest()
{
    TcpModbusResponse target = new TcpModbusResponse();

    byte[] RequestArray = _modbusUtility.HexStringToBytes(TestContext.DataRow[0].ToString());
    byte[] ResponseArray = _modbusUtility.HexStringToBytes(TestContext.DataRow[1].ToString());
    byte[] expected = _modbusUtility.HexStringToBytes(TestContext.DataRow[2].ToString());
    var actual = target.ReadDiscreteInputs(RequestArray, ResponseArray);
    Assert.IsTrue(expected.SequenceEqual(actual));
}

[TestMethod()]
[DeploymentItem("TestDoc\\TcpReadFunc3Test.csv")]
[DataSource("Microsoft.VisualStudio.TestTools.DataSource.CSV", "|DataDirectory|\\TestDoc\\TcpReadFunc3Test.csv",
    "TcpReadFunc3Test#csv", DataAccessMethod.Sequential)]
public void ReadHoldingRegistersTest()
{
    TcpModbusResponse target = new TcpModbusResponse();

    byte[] RequestArray = _modbusUtility.HexStringToBytes(TestContext.DataRow[0].ToString());
    byte[] ResponseArray = _modbusUtility.HexStringToBytes(TestContext.DataRow[1].ToString());
    byte[] expected = _modbusUtility.HexStringToBytes(TestContext.DataRow[2].ToString());

    var actual = target.ReadHoldingRegisters(RequestArray, ResponseArray);
    Assert.IsTrue(expected.SequenceEqual(actual));
}

[TestMethod()]
[DeploymentItem("TestDoc\\TcpReadFunc4Test.csv")]
[DataSource("Microsoft.VisualStudio.TestTools.DataSource.CSV", "|DataDirectory|\\TestDoc\\TcpReadFunc4Test.csv",
    "TcpReadFunc4Test#csv", DataAccessMethod.Sequential)]
public void ReadInputRegistersTest()
{
    TcpModbusResponse target = new TcpModbusResponse();

    byte[] RequestArray = _modbusUtility.HexStringToBytes(TestContext.DataRow[0].ToString());
    byte[] ResponseArray = _modbusUtility.HexStringToBytes(TestContext.DataRow[1].ToString());
    byte[] expected = _modbusUtility.HexStringToBytes(TestContext.DataRow[2].ToString());

    var actual = target.ReadInputRegisters(RequestArray, ResponseArray);
    Assert.IsTrue(expected.SequenceEqual(actual));
}

[TestMethod()]
public void WriteSingleCoilTest()
{
    TcpModbusResponse target = new TcpModbusResponse();
    byte[] RequestArray = _modbusUtility.HexStringToBytes("04 52 00 00 00 06 01 05 00 00 FF 00");
    byte[] ResponseArray = _modbusUtility.HexStringToBytes("04 52 00 00 00 06 01 05 00 00 FF 00");
    byte[] expected = ResponseArray;
    byte[] actual;
    actual = target.WriteSingleCoil(RequestArray, ResponseArray);
    Assert.IsTrue(expected.SequenceEqual(actual));
}

[TestMethod()]
public void WriteSingleRegisterTest()
{
    TcpModbusResponse target = new TcpModbusResponse();
    byte[] RequestArray = _modbusUtility.HexStringToBytes("04 F9 00 00 00 06 01 06 00 01 01 00");
    byte[] ResponseArray = _modbusUtility.HexStringToBytes("04 F9 00 00 00 06 01 06 00 01 01 00");

    byte[] expected = ResponseArray;
    byte[] actual;
    actual = target.WriteSingleRegister(RequestArray, ResponseArray);
    Assert.IsTrue(expected.SequenceEqual(actual));
}

[TestMethod()]
public void WriteMultipleCoilsTest()
{
    TcpModbusResponse target = new TcpModbusResponse();
    byte[] RequestArray = _modbusUtility.HexStringToBytes("03 7F 00 00 00 09 01 0F 00 00 00 09 02 0E 00");
    byte[] ResponseArray = _modbusUtility.HexStringToBytes("03 7F 00 00 00 06 01 0F 00 00 00 09");

    byte[] expected = ResponseArray;
    byte[] actual;
    actual = target.WriteMultipleCoils(RequestArray, ResponseArray);
    Assert.IsTrue(expected.SequenceEqual(actual));
}

[TestMethod()]
public void WriteMultipleRegistersTest()
{
    TcpModbusResponse target = new TcpModbusResponse();
    byte[] RequestArray =
        _modbusUtility.HexStringToBytes(
            "03 DA 00 00 00 1B 01 10 00 00 00 0A 14 00 4E 00 57 FF B2 FF A9 00 17 00 23 00 7B 00 0C 00 21 00 06");
    byte[] ResponseArray = _modbusUtility.HexStringToBytes("03 DA 00 00 00 06 01 10 00 00 00 0A");

    byte[] expected = ResponseArray;
    byte[] actual;
    actual = target.WriteMultipleRegisters(RequestArray, ResponseArray);
    Assert.IsTrue(expected.SequenceEqual(actual));
}

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