[TestMethod] // Handling Request on Server
public void WriteSingleRegisterPDU_LifeCycle()
{
var RandomGen = new Random();
int Address = RandomGen.Next(MinAddress, MaxAddress);
var Value = RandomGen.Next(0xFFFF);
var Server = new BaseModbusServer();
Server.AddHoldingRegister(Address);
var ClientPDU = new WriteSingleRegisterPDU(Address, Value);
var Request = ClientPDU.BuildRequest();
var ServerPDU = new WriteSingleRegisterPDU();
ServerPDU.CheckRequest(Request);
Assert.AreEqual(Address, ServerPDU.StartingAddress, "Whong Address recognition in CheckRequest");
ServerPDU.Handle(Server);
Assert.AreEqual(Value, ServerPDU.Value, "Whong Address recognition in CheckRequest");
ClientPDU.CheckResponse(ServerPDU.BuildResponse());
Assert.AreEqual(Value, ClientPDU.Value, "Whong Address recognition in CheckRequest");
}
[TestMethod] // Oficial Example
public void WriteSingleRegisterPDU_DocSampleReq()
{
var PDU = new WriteSingleRegisterPDU(1, 3);
var ExpectedReq = new byte[]
{
0x06, // Function Code
0x00, 0x01, // Starting Address
0x00, 0x03, // Value
};
var OkResponse = new byte[]
{
0x06, // Function Code
0x00, 0x01, // Starting Address
0x00, 0x03, // Value
};
var ExResponse = new byte[]
{
0x86,
0x01,
};
CollectionAssert.AreEqual(ExpectedReq, PDU.BuildRequest(), "Wrong Request");
Assert.AreEqual(Status.OK, PDU.CheckResponse(OkResponse), "OK status not recognited");
Assert.AreEqual(Status.Exception, PDU.CheckResponse(ExResponse), "Exception status not recognited");
}
public void WriteSingleRegisterPDU_ArgumentRange()
{
IProtocolDataUnit TestingPDU;
try
{
TestingPDU = new WriteSingleRegisterPDU(MinAddress - 1, 5);
Assert.Fail("Min Address Error");
}
catch (ArgumentOutOfRangeException) { }
try
{
TestingPDU = new WriteSingleRegisterPDU(MaxAddress + 1, 5);
Assert.Fail("Max Address Error");
}
catch (ArgumentOutOfRangeException) { }
}
public Status CheckRequest(byte[] Request)
{
if (Request.Length < 13)
return Status.Error;
Header = new MBAP(Request);
if (Header.ProtocolID != 0)
return Status.Error;
switch (Request[1])
{
case 0x01: PDU = new ReadCoilsPDU(); break;
case 0x02: PDU = new ReadDiscreteInputsPDU(); break;
case 0x03: PDU = new ReadHoldingRegistersPDU(); break;
case 0x04: PDU = new ReadInputRegistersPDU(); break;
case 0x05: PDU = new WriteSingleCoilPDU(); break;
case 0x06: PDU = new WriteSingleRegisterPDU(); break;
case 0x0F: PDU = new WriteMultipleCoilsPDU(); break;
case 0x10: PDU = new WriteMultipleRegistersPDU(); break;
default: return Status.Error;
}
var PDURequest = new byte[Request.Length - 3];
for (int i=0; i<PDURequest.Length; i++)
PDURequest[i] = Request[i + 1];
return PDU.CheckRequest(PDURequest);
}
public void WriteSingleRegister(IModbusDevice Device, int StartAddr, int Value)
{
if (!(Device is RTU_Device))
throw new ArgumentException("Wrong Type", "Device");
var PDU = new WriteSingleRegisterPDU(StartAddr, Value);
var ADU = new RTU_ADU((Device as RTU_Device), PDU);
Query(ADU);
}
public Status CheckRequest(byte[] Request)
{
if ( (Request.Length < 4) || (Request[0] != Device.Address) ) // 3 = Address + FuncCode + CRC_Lo + CRC_Hi
return Status.Error;
if (CRC.Get(Request) != 0)
return Status.Error;
switch (Request[1])
{
case 0x01: PDU = new ReadCoilsPDU(); break;
case 0x02: PDU = new ReadDiscreteInputsPDU(); break;
case 0x03: PDU = new ReadHoldingRegistersPDU(); break;
case 0x04: PDU = new ReadInputRegistersPDU(); break;
case 0x05: PDU = new WriteSingleCoilPDU(); break;
case 0x06: PDU = new WriteSingleRegisterPDU(); break;
case 0x0F: PDU = new WriteMultipleCoilsPDU(); break;
case 0x10: PDU = new WriteMultipleRegistersPDU(); break;
default: return Status.Error;
}
var PDURequest = new byte[Request.Length - 3];
for (int i=0; i<PDURequest.Length; i++)
PDURequest[i] = Request[i + 1];
return PDU.CheckRequest(PDURequest);
}
