├── .gitignore ├── Karonda.ModbusTcp.Client ├── Karonda.ModbusTcp.Client.csproj └── Program.cs ├── Karonda.ModbusTcp.Server ├── Karonda.ModbusTcp.Server.csproj ├── ModbusResponse.cs └── Program.cs ├── Karonda.ModbusTcp.sln ├── Karonda.ModbusTcp ├── Entity │ ├── Function │ │ ├── ExceptionFunction.cs │ │ ├── ReadCoilsInputsResponse.cs │ │ ├── ReadRegistersResponse.cs │ │ ├── ReadWriteMultiple.cs │ │ ├── Request │ │ │ ├── ReadCoilsRequest.cs │ │ │ ├── ReadDiscreteInputsRequest.cs │ │ │ ├── ReadHoldingRegistersRequest.cs │ │ │ ├── ReadInputRegistersRequest.cs │ │ │ ├── WriteMultipleCoilsRequest.cs │ │ │ ├── WriteMultipleRegistersRequest.cs │ │ │ ├── WriteSingleCoilRequest.cs │ │ │ └── WriteSingleRegisterRequest.cs │ │ ├── Response │ │ │ ├── ReadCoilsResponse.cs │ │ │ ├── ReadDiscreteInputsResponse.cs │ │ │ ├── ReadHoldingRegistersResponse.cs │ │ │ ├── ReadInputRegistersResponse.cs │ │ │ ├── WriteMultipleCoilsResponse.cs │ │ │ ├── WriteMultipleRegistersResponse.cs │ │ │ ├── WriteSingleCoilResponse.cs │ │ │ └── WriteSingleRegisterResponse.cs │ │ ├── WriteSingle.cs │ │ └── WriteSingleCoil.cs │ ├── ModbusCommand.cs │ ├── ModbusFrame.cs │ ├── ModbusFunction.cs │ └── ModbusHeader.cs ├── Handler │ ├── ModbusDecoder.cs │ ├── ModbusEncoder.cs │ ├── ModbusRequestHandler.cs │ └── ModbusResponseHandler.cs ├── Karonda.ModbusTcp.csproj ├── ModbusClient.cs ├── ModbusFunctionClassDiagram.cd ├── ModbusFunctionClassDiagram.png ├── ModbusResponseService.cs └── ModbusServer.cs ├── LICENSE └── README.md /.gitignore: -------------------------------------------------------------------------------- 1 | ## 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2 | using Karonda.ModbusTcp.Entity; 3 | using Karonda.ModbusTcp.Entity.Function.Response; 4 | using Microsoft.Extensions.Logging.Console; 5 | using System; 6 | using System.Threading.Tasks; 7 | 8 | namespace Karonda.ModbusTcp.Client 9 | { 10 | class Program 11 | { 12 | static async Task RunClientAsync() 13 | { 14 | //InternalLoggerFactory.DefaultFactory.AddProvider(new ConsoleLoggerProvider((s, level) => true, false)); 15 | 16 | ModbusClient client = new ModbusClient(0x01, "127.0.0.1"); 17 | 18 | try 19 | { 20 | await client.Connect(); 21 | 22 | while(true) 23 | { 24 | Console.WriteLine(@" 25 | <-------------------------------------------------------> 26 | 1: Read Coils; 2: Read Discrete Inputs; 27 | 3: Read Holding Registers; 4: Read Input Registers; 28 | 5: Write Single Coil; 6: Write Single Register; 29 | 15: Write Multiple Coils; 16: Write Multiple Registers; 30 | <------------------------------------------------------->"); 31 | var line = Console.ReadLine(); 32 | if (string.IsNullOrEmpty(line)) break; 33 | 34 | Console.WriteLine("<------------------------------------------------------->"); 35 | var command = Convert.ToInt32(line); 36 | 37 | ModbusFunction response = null; 38 | ushort startingAddress = 0x0000; 39 | ushort quantity = 0x000A; 40 | var state = true; 41 | ushort value = 0x0001; 42 | 43 | switch (command) 44 | { 45 | case 1: 46 | response = client.ReadCoils(startingAddress, quantity); 47 | var coils = (response as ReadCoilsResponse).Coils; 48 | for(int i =0;i< quantity; i++) 49 | { 50 | Console.WriteLine(coils[i]); 51 | } 52 | break; 53 | case 2: 54 | response = client.ReadDiscreteInputs(startingAddress, quantity); 55 | var inputs = (response as ReadDiscreteInputsResponse).Inputs; 56 | for (int i = 0; i < quantity; i++) 57 | { 58 | Console.WriteLine(inputs[i]); 59 | } 60 | break; 61 | case 3: 62 | response = client.ReadHoldingRegisters(startingAddress, quantity); 63 | foreach(var register in (response as ReadHoldingRegistersResponse).Registers) 64 | { 65 | Console.WriteLine(register); 66 | } 67 | break; 68 | case 4: 69 | response = client.ReadInputRegisters(startingAddress, quantity); 70 | foreach (var register in (response as ReadInputRegistersResponse).Registers) 71 | { 72 | Console.WriteLine(register); 73 | } 74 | break; 75 | case 5: 76 | response = client.WriteSingleCoil(startingAddress, state); 77 | Console.WriteLine((response as WriteSingleCoilResponse).State == state ? "Successed" : "Failed"); 78 | break; 79 | case 6: 80 | response = client.WriteSingleRegister(startingAddress, value); 81 | Console.WriteLine((response as WriteSingleRegisterResponse).Value == value ? "Successed" : "Failed"); 82 | break; 83 | case 15: 84 | var states = new bool[] { true, true, true, true, true, true, true, true, true, true }; 85 | response = client.WriteMultipleCoils(startingAddress, states); 86 | Console.WriteLine((response as WriteMultipleCoilsResponse).Quantity == states.Length); 87 | break; 88 | case 16: 89 | var registers = new ushort[] {1, 2, 3, 4, 5, 6, 7, 8, 9, 0}; 90 | response = client.WriteMultipleRegisters(startingAddress, registers); 91 | Console.WriteLine((response as WriteMultipleRegistersResponse).Quantity == registers.Length); 92 | break; 93 | } 94 | 95 | } 96 | 97 | await client.Close(); 98 | 99 | Console.ReadLine(); 100 | } 101 | catch (Exception exception) 102 | { 103 | Console.WriteLine(exception.Message); 104 | } 105 | } 106 | 107 | static void Main() => RunClientAsync().Wait(); 108 | } 109 | } 110 | -------------------------------------------------------------------------------- /Karonda.ModbusTcp.Server/Karonda.ModbusTcp.Server.csproj: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | Exe 5 | netcoreapp2.1 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | -------------------------------------------------------------------------------- /Karonda.ModbusTcp.Server/ModbusResponse.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | using System.Collections; 3 | using System.Collections.Generic; 4 | using System.Text; 5 | using Karonda.ModbusTcp.Entity; 6 | using Karonda.ModbusTcp.Entity.Function.Request; 7 | using Karonda.ModbusTcp.Entity.Function.Response; 8 | 9 | namespace Karonda.ModbusTcp.Server 10 | { 11 | public class ModbusResponse : ModbusResponseService 12 | { 13 | public override ModbusFunction ReadCoils(ReadCoilsRequest request) 14 | { 15 | var coilArray = ReadCoilsOrInputs(request.Quantity); 16 | var response = new ReadCoilsResponse(coilArray); 17 | 18 | return response; 19 | } 20 | 21 | public override ModbusFunction ReadDiscreteInputs(ReadDiscreteInputsRequest request) 22 | { 23 | var inputArray = ReadCoilsOrInputs(request.Quantity); 24 | var response = new ReadDiscreteInputsResponse(inputArray); 25 | 26 | return response; 27 | } 28 | 29 | public override ModbusFunction ReadHoldingRegisters(ReadHoldingRegistersRequest request) 30 | { 31 | var registers = ReadRegisters(request.Quantity); 32 | var response = new ReadHoldingRegistersResponse(registers); 33 | 34 | return response; 35 | } 36 | 37 | public override ModbusFunction ReadInputRegisters(ReadInputRegistersRequest request) 38 | { 39 | var registers = ReadRegisters(request.Quantity); 40 | var response = new ReadInputRegistersResponse(registers); 41 | 42 | return response; 43 | } 44 | 45 | public override ModbusFunction WriteSingleCoil(WriteSingleCoilRequest request) 46 | { 47 | var response = new WriteSingleCoilResponse(request.StartingAddress, request.State); 48 | return response; 49 | } 50 | 51 | public override ModbusFunction WriteSingleRegister(WriteSingleRegisterRequest request) 52 | { 53 | var response = new WriteSingleRegisterResponse(request.StartingAddress, request.Value); 54 | return response; 55 | } 56 | 57 | public override ModbusFunction WriteMultipleCoils(WriteMultipleCoilsRequest request) 58 | { 59 | var response = new WriteMultipleCoilsResponse(request.StartingAddress, request.Quantity); 60 | return response; 61 | } 62 | 63 | public override ModbusFunction WriteMultipleRegisters(WriteMultipleRegistersRequest request) 64 | { 65 | var response = new WriteMultipleRegistersResponse(request.StartingAddress, request.Quantity); 66 | return response; 67 | } 68 | 69 | private BitArray ReadCoilsOrInputs(ushort quantity) 70 | { 71 | var length = quantity + (8 - quantity % 8) % 8; 72 | var coils = new bool[length]; 73 | 74 | Random ran = new Random(); 75 | // from low to high 76 | for (int i = 0; i < coils.Length; i++) 77 | { 78 | if (i < quantity) 79 | { 80 | coils[i] = ran.Next() % 2 == 0; 81 | //coils[i] = true; 82 | } 83 | else 84 | { 85 | coils[i] = false; 86 | } 87 | } 88 | 89 | var arr = new BitArray(coils); 90 | return arr; 91 | } 92 | 93 | private ushort[] ReadRegisters(ushort quantity) 94 | { 95 | var registers = new ushort[quantity]; 96 | 97 | Random ran = new Random(); 98 | for (int i = 0; i < registers.Length; i++) 99 | { 100 | registers[i] = (ushort)ran.Next(ushort.MinValue, ushort.MaxValue); 101 | } 102 | 103 | return registers; 104 | } 105 | } 106 | } 107 | -------------------------------------------------------------------------------- /Karonda.ModbusTcp.Server/Program.cs: -------------------------------------------------------------------------------- 1 | using DotNetty.Common.Internal.Logging; 2 | using Microsoft.Extensions.Logging.Console; 3 | using System; 4 | using System.Threading.Tasks; 5 | 6 | namespace Karonda.ModbusTcp.Server 7 | { 8 | class Program 9 | { 10 | static async Task RunServerAsync() 11 | { 12 | //InternalLoggerFactory.DefaultFactory.AddProvider(new ConsoleLoggerProvider((s, level) => true, false)); 13 | 14 | ModbusResponse response = new ModbusResponse(); 15 | ModbusServer server = new ModbusServer(response); 16 | 17 | await server.Start(); 18 | 19 | Console.WriteLine("Server Started"); 20 | Console.ReadLine(); 21 | 22 | await server.Stop(); 23 | } 24 | 25 | static void Main() => RunServerAsync().Wait(); 26 | } 27 | } 28 | -------------------------------------------------------------------------------- /Karonda.ModbusTcp.sln: -------------------------------------------------------------------------------- 1 |  2 | Microsoft Visual Studio Solution File, Format Version 12.00 3 | # Visual Studio 15 4 | VisualStudioVersion = 15.0.28010.2050 5 | MinimumVisualStudioVersion = 10.0.40219.1 6 | Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Karonda.ModbusTcp", "Karonda.ModbusTcp\Karonda.ModbusTcp.csproj", "{6D7055D9-D2E6-4D48-9AA1-440E844F34E1}" 7 | EndProject 8 | Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Karonda.ModbusTcp.Client", "Karonda.ModbusTcp.Client\Karonda.ModbusTcp.Client.csproj", "{262F1BBF-A902-4F8B-B367-62388502DDFF}" 9 | EndProject 10 | Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Karonda.ModbusTcp.Server", "Karonda.ModbusTcp.Server\Karonda.ModbusTcp.Server.csproj", "{57CC2EE2-F4DD-4475-947A-D54F9CB33B93}" 11 | EndProject 12 | Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "src", "src", "{F445E325-BD11-485C-BC4D-A560C9BBA8FE}" 13 | EndProject 14 | Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "examples", "examples", "{FE0D1E90-583B-4612-8C3A-069CA15CDF69}" 15 | EndProject 16 | Global 17 | GlobalSection(SolutionConfigurationPlatforms) = preSolution 18 | Debug|Any CPU = Debug|Any CPU 19 | Release|Any CPU = Release|Any CPU 20 | EndGlobalSection 21 | GlobalSection(ProjectConfigurationPlatforms) = postSolution 22 | {6D7055D9-D2E6-4D48-9AA1-440E844F34E1}.Debug|Any CPU.ActiveCfg = Debug|Any CPU 23 | {6D7055D9-D2E6-4D48-9AA1-440E844F34E1}.Debug|Any CPU.Build.0 = Debug|Any CPU 24 | {6D7055D9-D2E6-4D48-9AA1-440E844F34E1}.Release|Any CPU.ActiveCfg = Release|Any CPU 25 | {6D7055D9-D2E6-4D48-9AA1-440E844F34E1}.Release|Any CPU.Build.0 = Release|Any CPU 26 | {262F1BBF-A902-4F8B-B367-62388502DDFF}.Debug|Any CPU.ActiveCfg = Debug|Any CPU 27 | {262F1BBF-A902-4F8B-B367-62388502DDFF}.Debug|Any CPU.Build.0 = Debug|Any CPU 28 | {262F1BBF-A902-4F8B-B367-62388502DDFF}.Release|Any CPU.ActiveCfg = Release|Any CPU 29 | {262F1BBF-A902-4F8B-B367-62388502DDFF}.Release|Any CPU.Build.0 = Release|Any CPU 30 | {57CC2EE2-F4DD-4475-947A-D54F9CB33B93}.Debug|Any CPU.ActiveCfg = Debug|Any CPU 31 | {57CC2EE2-F4DD-4475-947A-D54F9CB33B93}.Debug|Any CPU.Build.0 = Debug|Any CPU 32 | {57CC2EE2-F4DD-4475-947A-D54F9CB33B93}.Release|Any CPU.ActiveCfg = Release|Any CPU 33 | {57CC2EE2-F4DD-4475-947A-D54F9CB33B93}.Release|Any CPU.Build.0 = Release|Any CPU 34 | EndGlobalSection 35 | GlobalSection(SolutionProperties) = preSolution 36 | HideSolutionNode = FALSE 37 | EndGlobalSection 38 | GlobalSection(NestedProjects) = preSolution 39 | {6D7055D9-D2E6-4D48-9AA1-440E844F34E1} = {F445E325-BD11-485C-BC4D-A560C9BBA8FE} 40 | {262F1BBF-A902-4F8B-B367-62388502DDFF} = {FE0D1E90-583B-4612-8C3A-069CA15CDF69} 41 | {57CC2EE2-F4DD-4475-947A-D54F9CB33B93} = {FE0D1E90-583B-4612-8C3A-069CA15CDF69} 42 | EndGlobalSection 43 | GlobalSection(ExtensibilityGlobals) = postSolution 44 | SolutionGuid = {87424D19-0664-43CE-B730-54D88491D865} 45 | EndGlobalSection 46 | EndGlobal 47 | -------------------------------------------------------------------------------- /Karonda.ModbusTcp/Entity/Function/ExceptionFunction.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | using System.Collections.Generic; 3 | using System.Text; 4 | using DotNetty.Buffers; 5 | 6 | namespace Karonda.ModbusTcp.Entity.Function 7 | { 8 | /* 9 | * Modbus Exception Codes 10 | * 11 | * 01 ILLEGAL FUNCTION 12 | * 13 | * The function code received in the query is not an allowable action for 14 | * the server (or slave). This may be because the function code is only 15 | * applicable to newer devices, and was not implemented in the unit 16 | * selected. It could also indicate that the server (or slave) is in the 17 | * wrong state to process a request of this type, for example because it is 18 | * unconfigured and is being asked to return register values. 19 | * 20 | * 02 ILLEGAL DATA ADDRESS 21 | * 22 | * The data address received in the query is not an allowable address for 23 | * the server (or slave). More specifically, the combination of reference 24 | * number and transfer length is invalid. For a controller with 100 25 | * registers, the PDU addresses the first register as 0, and the last one as 26 | * 99. If a request is submitted with a starting register address of 96 and 27 | * a quantity of registers of 4, then this request will successfully operate 28 | * (address-wise at least) on registers 96, 97, 98, 99. If a request is 29 | * submitted with a starting register address of 96 and a quantity of 30 | * registers of 5, then this request will fail with Exception Code 0x02 31 | * “Illegal Data Address” since it attempts to operate on registers 96, 97, 32 | * 98, 99 and 100, and there is no register with address 100. 33 | * 34 | * 03 ILLEGAL DATA VALUE 35 | * 36 | * A value contained in the query data field is not an allowable value for 37 | * server (or slave). This indicates a fault in the structure of the 38 | * remainder of a complex request, such as that the implied length is 39 | * incorrect. It specifically does NOT mean that a data item submitted for 40 | * storage in a register has a value outside the expectation of the 41 | * application program, since the MODBUS protocol is unaware of the 42 | * significance of any particular value of any particular register. 43 | * 44 | * 04 SLAVE DEVICE FAILURE 45 | * 46 | * An unrecoverable error occurred while the server (or slave) was 47 | * attempting to perform the requested action. 48 | * 49 | * 05 ACKNOWLEDGE 50 | * 51 | * Specialized use in conjunction with programming commands. The server (or 52 | * slave) has accepted the request and is processing it, but a long duration 53 | * of time will be required to do so. This response is returned to prevent a 54 | * timeout error from occurring in the client (or master). The client (or 55 | * master) can next issue a Poll Program Complete message to determine if 56 | * processing is completed. 57 | * 58 | * 06 SLAVE DEVICE BUSY 59 | * 60 | * Specialized use in conjunction with programming commands. The server (or 61 | * slave) is engaged in processing a long–duration program command. The 62 | * client (or master) should retransmit the message later when the server 63 | * (or slave) is free. 64 | * 65 | * 08 MEMORY PARITY ERROR 66 | * 67 | * Specialized use in conjunction with function codes 20 and 21 and 68 | * reference type 6, to indicate that the extended file area failed to pass 69 | * a consistency check. The server (or slave) attempted to read record file, 70 | * but detected a parity error in the memory. The client (or master) can 71 | * retry the request, but service may be required on the server (or slave) 72 | * device. 73 | * 74 | * 0A GATEWAY PATH UNAVAILABLE 75 | * 76 | * Specialized use in conjunction with gateways, indicates that the gateway 77 | * was unable to allocate an internal communication path from the input port 78 | * to the output port for processing the request. Usually means that the 79 | * gateway is misconfigured or overloaded. 80 | * 81 | * 0B GATEWAY TARGET DEVICE FAILED TO RESPOND 82 | * 83 | * Specialized use in conjunction with gateways, indicates that no response 84 | * was obtained from the target device. Usually means that the device is not 85 | * present on the network. 86 | */ 87 | public class ExceptionFunction : ModbusFunction 88 | { 89 | public short ExceptionCode { get; private set; } 90 | public string ExceptionMessage 91 | { 92 | get 93 | { 94 | if (exceptions.ContainsKey(ExceptionCode)) 95 | { 96 | return exceptions[ExceptionCode]; 97 | } 98 | return "Undefined Error"; 99 | } 100 | } 101 | private static readonly Dictionary exceptions = new Dictionary 102 | { 103 | {0x01, "Illegal Function"}, 104 | {0x02, "Illegal Data Address"}, 105 | {0x03, "Illegal Data Value"}, 106 | {0x04, "Slave Device Failure"}, 107 | {0x05, "Acknowledge"}, 108 | {0x06, "Slave Device Busy"}, 109 | {0x08, "Memory Parity Error"}, 110 | {0x0A, "Gateway Path Unavailable"}, 111 | {0x0B, "Gateway Target Device Failed To Respond"}, 112 | 113 | }; 114 | public ExceptionFunction(short functionCode) 115 | : base(functionCode) 116 | { 117 | } 118 | public ExceptionFunction(short functionCode, short exceptionCode) 119 | : base(functionCode) 120 | { 121 | ExceptionCode = exceptionCode; 122 | } 123 | public override int CalculateLength() 124 | { 125 | return 1; 126 | } 127 | 128 | public override void Decode(IByteBuffer buffer) 129 | { 130 | ExceptionCode = buffer.ReadByte(); 131 | } 132 | 133 | public override IByteBuffer Encode() 134 | { 135 | IByteBuffer buffer = Unpooled.Buffer(); 136 | buffer.WriteByte(FunctionCode); 137 | 138 | buffer.WriteByte(ExceptionCode); 139 | 140 | return buffer; 141 | } 142 | 143 | public override string ToString() 144 | { 145 | return $"Exception Code: {ExceptionCode}, Message: {ExceptionMessage}"; 146 | } 147 | } 148 | } 149 | -------------------------------------------------------------------------------- /Karonda.ModbusTcp/Entity/Function/ReadCoilsInputsResponse.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | using System.Collections; 3 | using System.Collections.Generic; 4 | using System.Text; 5 | using DotNetty.Buffers; 6 | 7 | namespace Karonda.ModbusTcp.Entity.Function 8 | { 9 | public abstract class ReadCoilsInputsResponse : ModbusFunction 10 | { 11 | private ushort byteCount; 12 | protected BitArray CoilsOrInputs { get; private set; } 13 | public ReadCoilsInputsResponse(short functionCode) 14 | : base(functionCode) 15 | { 16 | 17 | } 18 | 19 | public ReadCoilsInputsResponse(short functionCode, BitArray coilsOrInputs) 20 | : this(functionCode) 21 | { 22 | CoilsOrInputs = coilsOrInputs; 23 | byteCount = (ushort)(CoilsOrInputs.Length / 8); 24 | } 25 | 26 | public override int CalculateLength() 27 | { 28 | return 1 + byteCount; 29 | } 30 | 31 | public override void Decode(IByteBuffer buffer) 32 | { 33 | byteCount = buffer.ReadByte(); 34 | var coilsOrInputs = new Byte[byteCount]; 35 | buffer.ReadBytes(coilsOrInputs); 36 | 37 | CoilsOrInputs = new BitArray(coilsOrInputs); 38 | } 39 | 40 | public override IByteBuffer Encode() 41 | { 42 | var coilsOrInputs = new Byte[byteCount]; 43 | CoilsOrInputs.CopyTo(coilsOrInputs, 0); 44 | 45 | IByteBuffer buffer = Unpooled.Buffer(); 46 | buffer.WriteByte(FunctionCode); 47 | buffer.WriteByte(byteCount); 48 | 49 | buffer.WriteBytes(coilsOrInputs); 50 | 51 | return buffer; 52 | } 53 | } 54 | } 55 | -------------------------------------------------------------------------------- /Karonda.ModbusTcp/Entity/Function/ReadRegistersResponse.cs: -------------------------------------------------------------------------------- 1 | using DotNetty.Buffers; 2 | using System; 3 | using System.Collections.Generic; 4 | using System.Text; 5 | 6 | namespace Karonda.ModbusTcp.Entity.Function 7 | { 8 | public abstract class ReadRegistersResponse : ModbusFunction 9 | { 10 | private ushort byteCount; 11 | public ushort[] Registers { get; private set; } 12 | public ReadRegistersResponse(short functionCode) 13 | : base(functionCode) 14 | { 15 | 16 | } 17 | 18 | public ReadRegistersResponse(short functionCode, ushort[] registers) 19 | : this(functionCode) 20 | { 21 | Registers = registers; 22 | byteCount = (ushort)(registers.Length * 2); 23 | } 24 | 25 | public override int CalculateLength() 26 | { 27 | return 1 + byteCount; 28 | } 29 | 30 | public override void Decode(IByteBuffer buffer) 31 | { 32 | byteCount = buffer.ReadByte(); 33 | Registers = new ushort[byteCount / 2]; 34 | for (int i = 0; i < Registers.Length; i++) 35 | { 36 | Registers[i] = buffer.ReadUnsignedShort(); 37 | } 38 | 39 | } 40 | 41 | public override IByteBuffer Encode() 42 | { 43 | IByteBuffer buffer = Unpooled.Buffer(); 44 | buffer.WriteByte(FunctionCode); 45 | buffer.WriteByte(byteCount); 46 | 47 | foreach (var register in Registers) 48 | { 49 | buffer.WriteUnsignedShort(register); 50 | } 51 | 52 | return buffer; 53 | } 54 | } 55 | } 56 | -------------------------------------------------------------------------------- /Karonda.ModbusTcp/Entity/Function/ReadWriteMultiple.cs: -------------------------------------------------------------------------------- 1 | using DotNetty.Buffers; 2 | using System; 3 | using System.Collections.Generic; 4 | using System.Text; 5 | 6 | namespace Karonda.ModbusTcp.Entity.Function 7 | { 8 | public abstract class ReadWriteMultiple : ModbusFunction 9 | { 10 | private readonly ushort MaxReadCoilsQuantity = 0x07D0;// 2000 11 | private readonly ushort MaxWriteCoilsQuantity = 0x07B0;// 1968 12 | private readonly ushort MaxReadRegistersQuantity = 0x007D;// 125 13 | private readonly ushort MaxWriteRegistersQuantity = 0x007B;//123 14 | private readonly string QuantityOutOfRange = "quantities must no more than {0}"; 15 | 16 | public ushort StartingAddress { get; private set; } 17 | public ushort Quantity { get; private set; } 18 | 19 | public ReadWriteMultiple(short functionCode) 20 | : base(functionCode) 21 | { 22 | } 23 | 24 | public ReadWriteMultiple(short functionCode, ushort startingAddress, ushort quantity) 25 | : base(functionCode) 26 | { 27 | StartingAddress = startingAddress; 28 | Quantity = quantity; 29 | 30 | WhetherQuantityIsOutOfRange(); 31 | } 32 | 33 | public override int CalculateLength() 34 | { 35 | return 2 + 2; // StartingAddress Length + Quantity Length 36 | } 37 | public override void Decode(IByteBuffer buffer) 38 | { 39 | StartingAddress = buffer.ReadUnsignedShort(); 40 | Quantity = buffer.ReadUnsignedShort(); 41 | 42 | WhetherQuantityIsOutOfRange(); 43 | } 44 | public override IByteBuffer Encode() 45 | { 46 | IByteBuffer buffer = Unpooled.Buffer(); 47 | buffer.WriteByte(FunctionCode); 48 | 49 | buffer.WriteUnsignedShort(StartingAddress); 50 | buffer.WriteUnsignedShort(Quantity); 51 | 52 | return buffer; 53 | } 54 | 55 | private void WhetherQuantityIsOutOfRange() 56 | { 57 | var exceptionMessage = string.Empty; 58 | switch ((ModbusCommand)FunctionCode) 59 | { 60 | case ModbusCommand.ReadCoils: 61 | case ModbusCommand.ReadDiscreteInputs: 62 | if (Quantity > MaxReadCoilsQuantity) 63 | exceptionMessage = string.Format(QuantityOutOfRange, MaxReadCoilsQuantity); 64 | break; 65 | case ModbusCommand.ReadHoldingRegisters: 66 | case ModbusCommand.ReadInputRegisters: 67 | if (Quantity > MaxReadRegistersQuantity) 68 | exceptionMessage = string.Format(QuantityOutOfRange, MaxReadRegistersQuantity); 69 | break; 70 | case ModbusCommand.WriteMultipleCoils: 71 | if (Quantity > MaxWriteCoilsQuantity) 72 | exceptionMessage = string.Format(QuantityOutOfRange, MaxWriteCoilsQuantity); 73 | break; 74 | case ModbusCommand.WriteMultipleRegisters: 75 | if (Quantity > MaxWriteRegistersQuantity) 76 | exceptionMessage = string.Format(QuantityOutOfRange, MaxWriteRegistersQuantity); 77 | break; 78 | } 79 | 80 | if (!string.IsNullOrEmpty(exceptionMessage)) 81 | throw new ArgumentOutOfRangeException(exceptionMessage); 82 | } 83 | } 84 | } 85 | -------------------------------------------------------------------------------- /Karonda.ModbusTcp/Entity/Function/Request/ReadCoilsRequest.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | using System.Collections.Generic; 3 | using System.Text; 4 | 5 | namespace Karonda.ModbusTcp.Entity.Function.Request 6 | { 7 | public class ReadCoilsRequest : ReadWriteMultiple 8 | { 9 | public ReadCoilsRequest() 10 | : base((short)ModbusCommand.ReadCoils) 11 | { 12 | 13 | } 14 | 15 | public ReadCoilsRequest(ushort startingAddress, ushort quantity) 16 | : base((short)ModbusCommand.ReadCoils, startingAddress, quantity) 17 | { 18 | } 19 | } 20 | } 21 | -------------------------------------------------------------------------------- /Karonda.ModbusTcp/Entity/Function/Request/ReadDiscreteInputsRequest.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | using System.Collections.Generic; 3 | using System.Text; 4 | 5 | namespace Karonda.ModbusTcp.Entity.Function.Request 6 | { 7 | public class ReadDiscreteInputsRequest : ReadWriteMultiple 8 | { 9 | public ReadDiscreteInputsRequest() 10 | : base((short)ModbusCommand.ReadDiscreteInputs) 11 | { 12 | 13 | } 14 | 15 | public ReadDiscreteInputsRequest(ushort startingAddress, ushort quantity) 16 | : base((short)ModbusCommand.ReadDiscreteInputs, startingAddress, quantity) 17 | { 18 | } 19 | } 20 | } 21 | -------------------------------------------------------------------------------- /Karonda.ModbusTcp/Entity/Function/Request/ReadHoldingRegistersRequest.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | using System.Collections.Generic; 3 | using System.Text; 4 | 5 | namespace Karonda.ModbusTcp.Entity.Function.Request 6 | { 7 | public class ReadHoldingRegistersRequest : ReadWriteMultiple 8 | { 9 | public ReadHoldingRegistersRequest() 10 | : base((short)ModbusCommand.ReadHoldingRegisters) 11 | { 12 | 13 | } 14 | 15 | public ReadHoldingRegistersRequest(ushort startingAddress, ushort quantity) 16 | : base((short)ModbusCommand.ReadHoldingRegisters, startingAddress, quantity) 17 | { 18 | } 19 | } 20 | } 21 | -------------------------------------------------------------------------------- /Karonda.ModbusTcp/Entity/Function/Request/ReadInputRegistersRequest.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | using System.Collections.Generic; 3 | using System.Text; 4 | 5 | namespace Karonda.ModbusTcp.Entity.Function.Request 6 | { 7 | public class ReadInputRegistersRequest : ReadWriteMultiple 8 | { 9 | public ReadInputRegistersRequest() 10 | : base((short)ModbusCommand.ReadInputRegisters) 11 | { 12 | 13 | } 14 | 15 | public ReadInputRegistersRequest(ushort startingAddress, ushort quantity) 16 | : base((short)ModbusCommand.ReadInputRegisters, startingAddress, quantity) 17 | { 18 | } 19 | } 20 | } 21 | -------------------------------------------------------------------------------- /Karonda.ModbusTcp/Entity/Function/Request/WriteMultipleCoilsRequest.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | using System.Collections; 3 | using System.Collections.Generic; 4 | using System.Text; 5 | using DotNetty.Buffers; 6 | 7 | namespace Karonda.ModbusTcp.Entity.Function.Request 8 | { 9 | public class WriteMultipleCoilsRequest : ReadWriteMultiple 10 | { 11 | private ushort byteCount; 12 | public BitArray Coils { get; private set; } 13 | public WriteMultipleCoilsRequest() 14 | : base((short)ModbusCommand.WriteMultipleCoils) 15 | { 16 | 17 | } 18 | 19 | public WriteMultipleCoilsRequest(ushort startingAddress, bool[] states) 20 | : base((short)ModbusCommand.WriteMultipleCoils, startingAddress, (ushort)states.Length) 21 | { 22 | var length = Quantity + (8 - Quantity % 8) % 8; 23 | 24 | if(length > Quantity) 25 | { 26 | var finalCoils = new List(); 27 | finalCoils.AddRange(states); 28 | for(var i = Quantity; i < length; i++) 29 | { 30 | finalCoils.Add(false); 31 | } 32 | 33 | Coils = new BitArray(finalCoils.ToArray()); 34 | } 35 | else 36 | { 37 | Coils = new BitArray(states); 38 | } 39 | 40 | byteCount = (ushort)(Coils.Length / 8); 41 | } 42 | 43 | public override int CalculateLength() 44 | { 45 | return base.CalculateLength() + 1 + byteCount; 46 | } 47 | 48 | public override void Decode(IByteBuffer buffer) 49 | { 50 | base.Decode(buffer); 51 | 52 | byteCount = buffer.ReadByte(); 53 | var coils = new byte[byteCount]; 54 | buffer.ReadBytes(coils); 55 | 56 | Coils = new BitArray(coils); 57 | } 58 | 59 | public override IByteBuffer Encode() 60 | { 61 | var coils = new byte[byteCount]; 62 | Coils.CopyTo(coils, 0); 63 | 64 | IByteBuffer buffer = base.Encode(); 65 | 66 | buffer.WriteByte(byteCount); 67 | 68 | buffer.WriteBytes(coils); 69 | 70 | return buffer; 71 | } 72 | } 73 | } 74 | -------------------------------------------------------------------------------- /Karonda.ModbusTcp/Entity/Function/Request/WriteMultipleRegistersRequest.cs: -------------------------------------------------------------------------------- 1 | using DotNetty.Buffers; 2 | using System; 3 | using System.Collections.Generic; 4 | using System.Text; 5 | 6 | namespace Karonda.ModbusTcp.Entity.Function.Request 7 | { 8 | public class WriteMultipleRegistersRequest : ReadWriteMultiple 9 | { 10 | private ushort byteCount; 11 | public ushort[] Registers { get; private set; } 12 | public WriteMultipleRegistersRequest() 13 | : base((short)ModbusCommand.WriteMultipleRegisters) 14 | { 15 | 16 | } 17 | 18 | public WriteMultipleRegistersRequest(ushort startingAddress, ushort[] registers) 19 | : base((short)ModbusCommand.WriteMultipleRegisters, startingAddress, (ushort)registers.Length) 20 | { 21 | byteCount = (ushort)(Quantity * 2); 22 | Registers = registers; 23 | } 24 | 25 | public override int CalculateLength() 26 | { 27 | return base.CalculateLength() + 1 + byteCount; 28 | } 29 | 30 | public override void Decode(IByteBuffer buffer) 31 | { 32 | base.Decode(buffer); 33 | 34 | byteCount = buffer.ReadByte(); 35 | 36 | Registers = new ushort[byteCount / 2]; 37 | for(int i=0;i 12 | * <---------------------------- MBAP -----------------------------------------><------------- PDU -------------> 13 | * +------------------------+---------------------+----------+-----------------++---------------+---------------+ 14 | * | Transaction Identifier | Protocol Identifier | Length | Unit Identifier || Function Code | Data | 15 | * | (2 Byte) | (2 Byte) | (2 Byte) | (1 Byte) || (1 Byte) | (1 - 252 Byte | 16 | * +------------------------+---------------------+----------+-----------------++---------------+---------------+ 17 | */ 18 | 19 | namespace Karonda.ModbusTcp.Entity 20 | { 21 | public class ModbusFrame 22 | { 23 | public ModbusHeader Header { get; set; } 24 | public ModbusFunction Function { get; set; } 25 | 26 | public ModbusFrame(ModbusHeader header, ModbusFunction function) 27 | { 28 | Header = header; 29 | Function = function; 30 | } 31 | 32 | public IByteBuffer Encode() 33 | { 34 | Header.Length = (ushort)(1 + 1 + Function.CalculateLength());// Unit Identifier + Function Code + data length 35 | 36 | IByteBuffer buffer = Unpooled.Buffer(); 37 | 38 | buffer.WriteBytes(Header.Encode()); 39 | buffer.WriteBytes(Function.Encode()); 40 | 41 | return buffer; 42 | } 43 | } 44 | } 45 | -------------------------------------------------------------------------------- /Karonda.ModbusTcp/Entity/ModbusFunction.cs: -------------------------------------------------------------------------------- 1 | using DotNetty.Buffers; 2 | using System; 3 | using System.Collections.Generic; 4 | using System.Text; 5 | 6 | namespace Karonda.ModbusTcp.Entity 7 | { 8 | public abstract class ModbusFunction 9 | { 10 | protected short FunctionCode { get; } 11 | 12 | protected ModbusFunction(short functionCode) 13 | { 14 | FunctionCode = functionCode; 15 | } 16 | /// 17 | /// PDU length -1 (not include function code length) 18 | /// 19 | /// 20 | public abstract int CalculateLength(); 21 | 22 | public abstract void Decode(IByteBuffer buffer); 23 | 24 | public abstract IByteBuffer Encode(); 25 | 26 | } 27 | } 28 | -------------------------------------------------------------------------------- /Karonda.ModbusTcp/Entity/ModbusHeader.cs: -------------------------------------------------------------------------------- 1 | using DotNetty.Buffers; 2 | using System; 3 | using System.Collections.Generic; 4 | using System.Text; 5 | 6 | namespace Karonda.ModbusTcp.Entity 7 | { 8 | public class ModbusHeader 9 | { 10 | public ushort TransactionIdentifier { get; set; } 11 | public ushort ProtocolIdentifier { get; set; } 12 | public ushort Length { get; set; } 13 | public short UnitIdentifier { get; set; } 14 | 15 | public ModbusHeader(IByteBuffer buffer) 16 | { 17 | TransactionIdentifier = buffer.ReadUnsignedShort(); 18 | ProtocolIdentifier = buffer.ReadUnsignedShort(); 19 | Length = buffer.ReadUnsignedShort(); 20 | UnitIdentifier = buffer.ReadByte(); // readUnsignedByte 21 | } 22 | 23 | public ModbusHeader(ushort transactionIdentifier, short unitIdentifier) 24 | : this(transactionIdentifier, 0x0000, unitIdentifier) // for modbus protocol: Protocol Identifier = 0x00 25 | { 26 | 27 | } 28 | 29 | private ModbusHeader(ushort transactionIdentifier, ushort protocolIdentifier, short unitIdentifier) 30 | { 31 | TransactionIdentifier = transactionIdentifier; 32 | ProtocolIdentifier = protocolIdentifier; 33 | UnitIdentifier = unitIdentifier; 34 | } 35 | 36 | public IByteBuffer Encode() 37 | { 38 | IByteBuffer buffer = Unpooled.Buffer(); 39 | 40 | buffer.WriteUnsignedShort(TransactionIdentifier); 41 | buffer.WriteUnsignedShort(ProtocolIdentifier); 42 | buffer.WriteUnsignedShort(Length); 43 | buffer.WriteByte(UnitIdentifier); 44 | 45 | return buffer; 46 | } 47 | } 48 | } 49 | -------------------------------------------------------------------------------- /Karonda.ModbusTcp/Handler/ModbusDecoder.cs: -------------------------------------------------------------------------------- 1 | using DotNetty.Buffers; 2 | using DotNetty.Codecs; 3 | using DotNetty.Transport.Channels; 4 | using Karonda.ModbusTcp.Entity; 5 | using Karonda.ModbusTcp.Entity.Function; 6 | using Karonda.ModbusTcp.Entity.Function.Request; 7 | using Karonda.ModbusTcp.Entity.Function.Response; 8 | using System; 9 | using System.Collections.Generic; 10 | using System.Text; 11 | 12 | namespace Karonda.ModbusTcp.Handler 13 | { 14 | public class ModbusDecoder : ByteToMessageDecoder 15 | { 16 | private bool isServerMode; 17 | private readonly short maxFunctionCode = 0x80; 18 | private readonly string typeName = "Karonda.ModbusTcp.Entity.Function.{0}.{1}{0}"; 19 | 20 | public ModbusDecoder(bool isServerMode) 21 | { 22 | this.isServerMode = isServerMode; 23 | } 24 | protected override void Decode(IChannelHandlerContext context, IByteBuffer input, List output) 25 | { 26 | //Transaction Identifier + Protocol Identifier + Length + Unit Identifier + Function Code 27 | if (input.Capacity < 2 + 2 + 2 + 1 + 1) 28 | { 29 | return; 30 | } 31 | 32 | ModbusHeader header = new ModbusHeader(input); 33 | short functionCode = input.ReadByte(); 34 | ModbusFunction function = null; 35 | 36 | if(Enum.IsDefined(typeof(ModbusCommand), functionCode)) 37 | { 38 | var command = Enum.GetName(typeof(ModbusCommand), functionCode); 39 | 40 | function = (ModbusFunction)Activator.CreateInstance(Type.GetType(string.Format(typeName, isServerMode ? "Request" : "Response", command))); 41 | } 42 | 43 | 44 | if (functionCode >= maxFunctionCode) 45 | { 46 | function = new ExceptionFunction(functionCode); 47 | } 48 | else if(function == null) 49 | { 50 | function = new ExceptionFunction(functionCode, 0x01); 51 | } 52 | 53 | function.Decode(input); 54 | ModbusFrame frame = new ModbusFrame(header, function); 55 | 56 | output.Add(frame); 57 | } 58 | } 59 | } 60 | -------------------------------------------------------------------------------- /Karonda.ModbusTcp/Handler/ModbusEncoder.cs: -------------------------------------------------------------------------------- 1 | using DotNetty.Transport.Channels; 2 | using Karonda.ModbusTcp.Entity; 3 | using System; 4 | using System.Collections.Generic; 5 | using System.Text; 6 | using System.Threading.Tasks; 7 | 8 | namespace Karonda.ModbusTcp.Handler 9 | { 10 | public class ModbusEncoder : ChannelHandlerAdapter 11 | { 12 | public override Task WriteAsync(IChannelHandlerContext context, object message) 13 | { 14 | if (message is ModbusFrame) 15 | { 16 | var frame = (ModbusFrame)message; 17 | return context.WriteAndFlushAsync(frame.Encode()); 18 | } 19 | 20 | return context.WriteAsync(message); 21 | } 22 | } 23 | } 24 | -------------------------------------------------------------------------------- /Karonda.ModbusTcp/Handler/ModbusRequestHandler.cs: -------------------------------------------------------------------------------- 1 | using DotNetty.Transport.Channels; 2 | using Karonda.ModbusTcp.Entity; 3 | using Karonda.ModbusTcp.Entity.Function.Request; 4 | using System; 5 | using System.Collections.Generic; 6 | using System.Text; 7 | 8 | namespace Karonda.ModbusTcp.Handler 9 | { 10 | public class ModbusRequestHandler : SimpleChannelInboundHandler 11 | { 12 | private ModbusResponseService responseService; 13 | public ModbusRequestHandler(ModbusResponseService responseService) 14 | { 15 | this.responseService = responseService; 16 | } 17 | 18 | protected override void ChannelRead0(IChannelHandlerContext ctx, ModbusFrame msg) 19 | { 20 | var function = msg.Function; 21 | var response = responseService.Execute(function); 22 | 23 | var header = msg.Header; 24 | var frame = new ModbusFrame(header, response); 25 | 26 | ctx.WriteAndFlushAsync(frame); 27 | } 28 | } 29 | } 30 | -------------------------------------------------------------------------------- /Karonda.ModbusTcp/Handler/ModbusResponseHandler.cs: -------------------------------------------------------------------------------- 1 | using DotNetty.Transport.Channels; 2 | using Karonda.ModbusTcp.Entity; 3 | using Karonda.ModbusTcp.Entity.Function; 4 | using System; 5 | using System.Collections.Generic; 6 | using System.Text; 7 | using System.Threading; 8 | 9 | namespace Karonda.ModbusTcp.Handler 10 | { 11 | public class ModbusResponseHandler : SimpleChannelInboundHandler 12 | { 13 | private readonly int timeoutMilliseconds = 2000; 14 | private Dictionary responses = new Dictionary(); 15 | protected override void ChannelRead0(IChannelHandlerContext ctx, ModbusFrame msg) 16 | { 17 | responses.Add(msg.Header.TransactionIdentifier, msg); 18 | } 19 | 20 | public ModbusFrame GetResponse(ushort transactionIdentifier) 21 | { 22 | ModbusFrame frame = null; 23 | var timeoutDateTime = DateTime.Now.AddMilliseconds(timeoutMilliseconds); 24 | do 25 | { 26 | Thread.Sleep(1); 27 | if (responses.ContainsKey(transactionIdentifier)) 28 | { 29 | frame = responses[transactionIdentifier]; 30 | responses.Remove(transactionIdentifier); 31 | } 32 | } 33 | while (frame == null && DateTime.Now < timeoutDateTime); 34 | 35 | if(frame == null) 36 | { 37 | throw new Exception("No Response"); 38 | } 39 | else if(frame.Function is ExceptionFunction) 40 | { 41 | throw new Exception(frame.Function.ToString()); 42 | } 43 | 44 | return frame; 45 | } 46 | 47 | public override void ExceptionCaught(IChannelHandlerContext context, Exception exception) 48 | { 49 | context.CloseAsync(); 50 | } 51 | } 52 | } 53 | -------------------------------------------------------------------------------- /Karonda.ModbusTcp/Karonda.ModbusTcp.csproj: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | netcoreapp2.1 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | -------------------------------------------------------------------------------- /Karonda.ModbusTcp/ModbusClient.cs: -------------------------------------------------------------------------------- 1 | using DotNetty.Handlers.Logging; 2 | using DotNetty.Transport.Bootstrapping; 3 | using DotNetty.Transport.Channels; 4 | using DotNetty.Transport.Channels.Sockets; 5 | using Karonda.ModbusTcp.Entity; 6 | using Karonda.ModbusTcp.Entity.Function.Request; 7 | using Karonda.ModbusTcp.Entity.Function.Response; 8 | using Karonda.ModbusTcp.Handler; 9 | using System; 10 | using System.Collections.Generic; 11 | using System.Net; 12 | using System.Text; 13 | using System.Threading.Tasks; 14 | 15 | namespace Karonda.ModbusTcp 16 | { 17 | public class ModbusClient 18 | { 19 | public string Ip { get; } 20 | public int Port { get; } 21 | public short UnitIdentifier { get; } 22 | public IChannel Channel { get; private set; } 23 | 24 | private MultithreadEventLoopGroup group; 25 | private ConnectionState connectionState; 26 | private ushort transactionIdentifier; 27 | private readonly string handlerName = "response"; 28 | 29 | public ModbusClient(short unitIdentifier, string ip, int port = 502) 30 | { 31 | Ip = ip; 32 | Port = port; 33 | UnitIdentifier = unitIdentifier; 34 | 35 | connectionState = ConnectionState.NotConnected; 36 | } 37 | 38 | public async Task Connect() 39 | { 40 | group = new MultithreadEventLoopGroup(); 41 | 42 | try 43 | { 44 | var bootstrap = new Bootstrap(); 45 | bootstrap 46 | .Group(group) 47 | .Channel() 48 | .Option(ChannelOption.TcpNodelay, true) 49 | .Handler(new ActionChannelInitializer(channel => 50 | { 51 | IChannelPipeline pipeline = channel.Pipeline; 52 | 53 | //pipeline.AddLast(new LoggingHandler()); 54 | //pipeline.AddLast("framing-enc", new LengthFieldPrepender(2)); 55 | pipeline.AddLast("encoder", new ModbusEncoder()); 56 | pipeline.AddLast("decoder", new ModbusDecoder(false)); 57 | 58 | pipeline.AddLast(handlerName, new ModbusResponseHandler()); 59 | })); 60 | 61 | connectionState = ConnectionState.Pending; 62 | 63 | Channel = await bootstrap.ConnectAsync(new IPEndPoint(IPAddress.Parse(Ip), Port)); 64 | 65 | connectionState = ConnectionState.Connected; 66 | } 67 | catch (Exception exception) 68 | { 69 | throw exception; 70 | } 71 | } 72 | 73 | public async Task Close() 74 | { 75 | if (ConnectionState.Connected == connectionState) 76 | { 77 | try 78 | { 79 | await Channel.CloseAsync(); 80 | } 81 | finally 82 | { 83 | await group.ShutdownGracefullyAsync(TimeSpan.FromMilliseconds(100), TimeSpan.FromSeconds(1)); 84 | 85 | connectionState = ConnectionState.NotConnected; 86 | } 87 | } 88 | } 89 | 90 | public ushort CallModbusFunction(ModbusFunction function) 91 | { 92 | if (ConnectionState.Connected != connectionState || Channel == null) 93 | { 94 | throw new Exception("Not connected!"); 95 | } 96 | 97 | SetTransactionIdentifier(); 98 | 99 | ModbusHeader header = new ModbusHeader(transactionIdentifier, UnitIdentifier); 100 | ModbusFrame frame = new ModbusFrame(header, function); 101 | Channel.WriteAndFlushAsync(frame); 102 | 103 | return transactionIdentifier; 104 | } 105 | 106 | public T CallModbusFunctionSync(ModbusFunction function) where T : ModbusFunction 107 | { 108 | var transactionIdentifier = CallModbusFunction(function); 109 | 110 | var handler = (ModbusResponseHandler)Channel.Pipeline.Get(handlerName); 111 | if (handler == null) 112 | { 113 | throw new Exception("Not connected!"); 114 | } 115 | 116 | return (T)handler.GetResponse(transactionIdentifier).Function; 117 | } 118 | 119 | private void SetTransactionIdentifier() 120 | { 121 | if (transactionIdentifier < ushort.MaxValue) 122 | { 123 | transactionIdentifier++; 124 | } 125 | else 126 | { 127 | transactionIdentifier = 1; 128 | } 129 | } 130 | 131 | public ushort ReadCoilsAsync(ushort startingAddress, ushort quantity) 132 | { 133 | var function = new ReadCoilsRequest(startingAddress, quantity); 134 | return CallModbusFunction(function); 135 | } 136 | 137 | public ushort ReadDiscreteInputsAsync(ushort startingAddress, ushort quantity) 138 | { 139 | var function = new ReadDiscreteInputsRequest(startingAddress, quantity); 140 | return CallModbusFunction(function); 141 | } 142 | 143 | public ushort ReadHoldingRegistersAsync(ushort startingAddress, ushort quantity) 144 | { 145 | var function = new ReadHoldingRegistersRequest(startingAddress, quantity); 146 | return CallModbusFunction(function); 147 | } 148 | 149 | public ushort ReadInputRegistersAsync(ushort startingAddress, ushort quantity) 150 | { 151 | var function = new ReadInputRegistersRequest(startingAddress, quantity); 152 | return CallModbusFunction(function); 153 | } 154 | 155 | public ushort WriteSingleCoilAsync(ushort startingAddress, bool state) 156 | { 157 | var function = new WriteSingleCoilRequest(startingAddress, state); 158 | return CallModbusFunction(function); 159 | } 160 | 161 | public ushort WriteSingleRegisterAsync(ushort startingAddress, ushort value) 162 | { 163 | var function = new WriteSingleRegisterRequest(startingAddress, value); 164 | return CallModbusFunction(function); 165 | } 166 | 167 | public ushort WriteMultipleCoilsAsync(ushort startingAddress, bool[] states) 168 | { 169 | var function = new WriteMultipleCoilsRequest(startingAddress, states); 170 | return CallModbusFunction(function); 171 | } 172 | 173 | public ushort WriteMultipleRegistersAsync(ushort startingAddress, ushort[] registers) 174 | { 175 | var function = new WriteMultipleRegistersRequest(startingAddress, registers); 176 | return CallModbusFunction(function); 177 | } 178 | 179 | 180 | 181 | public ReadCoilsResponse ReadCoils(ushort startingAddress, ushort quantity) 182 | { 183 | var function = new ReadCoilsRequest(startingAddress, quantity); 184 | return CallModbusFunctionSync(function); 185 | } 186 | 187 | public ReadDiscreteInputsResponse ReadDiscreteInputs(ushort startingAddress, ushort quantity) 188 | { 189 | var function = new ReadDiscreteInputsRequest(startingAddress, quantity); 190 | return CallModbusFunctionSync(function); 191 | } 192 | 193 | public ReadHoldingRegistersResponse ReadHoldingRegisters(ushort startingAddress, ushort quantity) 194 | { 195 | var function = new ReadHoldingRegistersRequest(startingAddress, quantity); 196 | return CallModbusFunctionSync(function); 197 | } 198 | 199 | public ReadInputRegistersResponse ReadInputRegisters(ushort startingAddress, ushort quantity) 200 | { 201 | var function = new ReadInputRegistersRequest(startingAddress, quantity); 202 | return CallModbusFunctionSync(function); 203 | } 204 | 205 | public WriteSingleCoilResponse WriteSingleCoil(ushort startingAddress, bool state) 206 | { 207 | var function = new WriteSingleCoilRequest(startingAddress, state); 208 | return CallModbusFunctionSync(function); 209 | } 210 | 211 | public WriteSingleRegisterResponse WriteSingleRegister(ushort startingAddress, ushort value) 212 | { 213 | var function = new WriteSingleRegisterRequest(startingAddress, value); 214 | return CallModbusFunctionSync(function); 215 | } 216 | 217 | public WriteMultipleCoilsResponse WriteMultipleCoils(ushort startingAddress, bool[] states) 218 | { 219 | var function = new WriteMultipleCoilsRequest(startingAddress, states); 220 | return CallModbusFunctionSync(function); 221 | } 222 | 223 | public WriteMultipleRegistersResponse WriteMultipleRegisters(ushort startingAddress, ushort[] registers) 224 | { 225 | var function = new WriteMultipleRegistersRequest(startingAddress, registers); 226 | return CallModbusFunctionSync(function); 227 | } 228 | 229 | } 230 | 231 | 232 | 233 | public enum ConnectionState 234 | { 235 | NotConnected = 0, 236 | Connected = 1, 237 | Pending = 2, 238 | } 239 | } 240 | -------------------------------------------------------------------------------- /Karonda.ModbusTcp/ModbusFunctionClassDiagram.cd: -------------------------------------------------------------------------------- 1 |  2 | 3 | 4 | 5 | 6 | AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA= 7 | Entity\Function\Request\ReadCoilsRequest.cs 8 | 9 | 10 | 11 | 12 | 13 | AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA= 14 | Entity\Function\Request\ReadDiscreteInputsRequest.cs 15 | 16 | 17 | 18 | 19 | 20 | AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA= 21 | Entity\Function\Request\ReadHoldingRegistersRequest.cs 22 | 23 | 24 | 25 | 26 | 27 | AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA= 28 | Entity\Function\Request\ReadInputRegistersRequest.cs 29 | 30 | 31 | 32 | 33 | 34 | AAAAAAAAAABAABgAAAAAAgAAAAAAAAAAAAAAQAAAAAA= 35 | Entity\Function\Request\WriteMultipleCoilsRequest.cs 36 | 37 | 38 | 39 | 40 | 41 | AAAAAAAAAABAABgAAAAAAAAAAAABAAAAAAAAQAAAAAA= 42 | Entity\Function\Request\WriteMultipleRegistersRequest.cs 43 | 44 | 45 | 46 | 47 | 48 | AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA= 49 | Entity\Function\Request\WriteSingleCoilRequest.cs 50 | 51 | 52 | 53 | 54 | 55 | AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA= 56 | Entity\Function\Request\WriteSingleRegisterRequest.cs 57 | 58 | 59 | 60 | 61 | 62 | AAAAAAAAAAAAAAAAAAAAAgAAAAAAAAAAAAAAAAAAAAA= 63 | Entity\Function\Response\ReadCoilsResponse.cs 64 | 65 | 66 | 67 | 68 | 69 | AAAAAAAAAAAAAAAAAAAAAAAAEAAAAAAAAAAAAAAAAAA= 70 | Entity\Function\Response\ReadDiscreteInputsResponse.cs 71 | 72 | 73 | 74 | 75 | 76 | AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA= 77 | Entity\Function\Response\ReadHoldingRegistersResponse.cs 78 | 79 | 80 | 81 | 82 | 83 | AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA= 84 | Entity\Function\Response\ReadInputRegistersResponse.cs 85 | 86 | 87 | 88 | 89 | 90 | AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA= 91 | Entity\Function\Response\WriteMultipleCoilsResponse.cs 92 | 93 | 94 | 95 | 96 | 97 | AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA= 98 | Entity\Function\Response\WriteMultipleRegistersResponse.cs 99 | 100 | 101 | 102 | 103 | 104 | AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA= 105 | Entity\Function\Response\WriteSingleCoilResponse.cs 106 | 107 | 108 | 109 | 110 | 111 | AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA= 112 | Entity\Function\Response\WriteSingleRegisterResponse.cs 113 | 114 | 115 | 116 | 117 | 118 | AAAAAAAAAABAAAgEAAAAAAAIgAAAAAAAAAAAQAAAIAA= 119 | Entity\Function\ExceptionFunction.cs 120 | 121 | 122 | 123 | 124 | 125 | AAAAAAAAAABAABgAAAAAAAAAEAAAAAAAAAAAQAAAAAA= 126 | Entity\Function\ReadCoilsInputsResponse.cs 127 | 128 | 129 | 130 | 131 | 132 | AAAAAAAAAABAABgAAAAAAAAAAAABAAAAAAAAQAAAAAA= 133 | Entity\Function\ReadRegistersResponse.cs 134 | 135 | 136 | 137 | 138 | 139 | ABAAQAAAAABAEAgAAAAAAEAAAAAAAAAAAAQAwAAAEIA= 140 | Entity\Function\ReadWriteMultiple.cs 141 | 142 | 143 | 144 | 145 | 146 | AAAAAAAAAABAEAgAAAAAAAAAAAAAAAAAAAAgQAAAAAA= 147 | Entity\Function\WriteSingle.cs 148 | 149 | 150 | 151 | 152 | 153 | AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAABAAAAAA= 154 | Entity\Function\WriteSingleCoil.cs 155 | 156 | 157 | 158 | 159 | 160 | AAAAAAAAAABAAAgAAAAAAAAAAAAAAAAAAAAARAAAAAA= 161 | Entity\ModbusFunction.cs 162 | 163 | 164 | 165 | -------------------------------------------------------------------------------- /Karonda.ModbusTcp/ModbusFunctionClassDiagram.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/VictorBu/modbus-tcp/9379e63884150d0c28f23e22076ba753f199f587/Karonda.ModbusTcp/ModbusFunctionClassDiagram.png -------------------------------------------------------------------------------- /Karonda.ModbusTcp/ModbusResponseService.cs: -------------------------------------------------------------------------------- 1 | using Karonda.ModbusTcp.Entity; 2 | using Karonda.ModbusTcp.Entity.Function.Request; 3 | using System; 4 | using System.Collections.Generic; 5 | using System.Text; 6 | 7 | namespace Karonda.ModbusTcp 8 | { 9 | public abstract class ModbusResponseService 10 | { 11 | public ModbusFunction Execute(ModbusFunction function) 12 | { 13 | if (function is ReadCoilsRequest) 14 | { 15 | var request = (ReadCoilsRequest)function; 16 | return ReadCoils(request); 17 | } 18 | else if (function is ReadDiscreteInputsRequest) 19 | { 20 | var request = (ReadDiscreteInputsRequest)function; 21 | return ReadDiscreteInputs(request); 22 | } 23 | else if (function is ReadHoldingRegistersRequest) 24 | { 25 | var request = (ReadHoldingRegistersRequest)function; 26 | return ReadHoldingRegisters(request); 27 | 28 | } 29 | else if (function is ReadInputRegistersRequest) 30 | { 31 | var request = (ReadInputRegistersRequest)function; 32 | return ReadInputRegisters(request); 33 | } 34 | else if(function is WriteSingleCoilRequest) 35 | { 36 | var request = (WriteSingleCoilRequest)function; 37 | return WriteSingleCoil(request); 38 | } 39 | else if(function is WriteSingleRegisterRequest) 40 | { 41 | var request = (WriteSingleRegisterRequest)function; 42 | return WriteSingleRegister(request); 43 | } 44 | else if(function is WriteMultipleCoilsRequest) 45 | { 46 | var request = (WriteMultipleCoilsRequest)function; 47 | return WriteMultipleCoils(request); 48 | } 49 | else if(function is WriteMultipleRegistersRequest) 50 | { 51 | var request = (WriteMultipleRegistersRequest)function; 52 | return WriteMultipleRegisters(request); 53 | } 54 | 55 | throw new Exception("Function Not Support"); 56 | } 57 | public abstract ModbusFunction ReadCoils(ReadCoilsRequest request); 58 | 59 | public abstract ModbusFunction ReadDiscreteInputs(ReadDiscreteInputsRequest request); 60 | 61 | public abstract ModbusFunction ReadHoldingRegisters(ReadHoldingRegistersRequest request); 62 | 63 | public abstract ModbusFunction ReadInputRegisters(ReadInputRegistersRequest request); 64 | 65 | public abstract ModbusFunction WriteSingleCoil(WriteSingleCoilRequest request); 66 | 67 | public abstract ModbusFunction WriteSingleRegister(WriteSingleRegisterRequest request); 68 | 69 | public abstract ModbusFunction WriteMultipleCoils(WriteMultipleCoilsRequest request); 70 | 71 | public abstract ModbusFunction WriteMultipleRegisters(WriteMultipleRegistersRequest request); 72 | } 73 | } 74 | -------------------------------------------------------------------------------- /Karonda.ModbusTcp/ModbusServer.cs: -------------------------------------------------------------------------------- 1 | using DotNetty.Codecs; 2 | using DotNetty.Common.Internal.Logging; 3 | using DotNetty.Handlers.Logging; 4 | using DotNetty.Transport.Bootstrapping; 5 | using DotNetty.Transport.Channels; 6 | using DotNetty.Transport.Channels.Sockets; 7 | using Karonda.ModbusTcp.Handler; 8 | using System; 9 | using System.Collections.Generic; 10 | using System.Text; 11 | using System.Threading.Tasks; 12 | 13 | namespace Karonda.ModbusTcp 14 | { 15 | public class ModbusServer 16 | { 17 | private ModbusResponseService responseService; 18 | private ServerState serverState; 19 | public int Port { get; } 20 | public IChannel Channel { get; private set; } 21 | private IEventLoopGroup bossGroup; 22 | private IEventLoopGroup workerGroup; 23 | public ModbusServer(ModbusResponseService responseService, int port = 502) 24 | { 25 | this.responseService = responseService; 26 | Port = port; 27 | serverState = ServerState.NotStarted; 28 | } 29 | 30 | public async Task Start() 31 | { 32 | bossGroup = new MultithreadEventLoopGroup(1); 33 | workerGroup = new MultithreadEventLoopGroup(); 34 | 35 | try 36 | { 37 | var bootstrap = new ServerBootstrap(); 38 | bootstrap.Group(bossGroup, workerGroup); 39 | 40 | bootstrap 41 | .Channel() 42 | .Option(ChannelOption.SoBacklog, 100) 43 | //.Handler(new LoggingHandler("SRV-LSTN")) 44 | .ChildHandler(new ActionChannelInitializer(channel => 45 | { 46 | IChannelPipeline pipeline = channel.Pipeline; 47 | //pipeline.AddLast(new LoggingHandler("SRV-CONN")); 48 | //pipeline.AddLast("framing-enc", new LengthFieldPrepender(2)); 49 | pipeline.AddLast("encoder", new ModbusEncoder()); 50 | pipeline.AddLast("decoder", new ModbusDecoder(true)); 51 | 52 | pipeline.AddLast("request", new ModbusRequestHandler(responseService)); 53 | })); 54 | 55 | serverState = ServerState.Starting; 56 | 57 | Channel = await bootstrap.BindAsync(Port); 58 | 59 | serverState = ServerState.Started; 60 | } 61 | finally 62 | { 63 | 64 | } 65 | } 66 | 67 | public async Task Stop() 68 | { 69 | if (ServerState.Starting == serverState) 70 | { 71 | try 72 | { 73 | await Channel.CloseAsync(); 74 | } 75 | finally 76 | { 77 | await Task.WhenAll( 78 | bossGroup.ShutdownGracefullyAsync(TimeSpan.FromMilliseconds(100), TimeSpan.FromSeconds(1)), 79 | workerGroup.ShutdownGracefullyAsync(TimeSpan.FromMilliseconds(100), TimeSpan.FromSeconds(1))); 80 | 81 | serverState = ServerState.NotStarted; 82 | } 83 | } 84 | } 85 | } 86 | 87 | public enum ServerState 88 | { 89 | NotStarted = 0, 90 | Started = 1, 91 | Starting = 2, 92 | } 93 | } 94 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. 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But first, please read 674 | . 675 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # Modbus TCP 2 | 3 | Modbus TCP client/server implementation in C# with DotNetty. 4 | 5 | A port of [modjn](https://github.com/klymenek/modjn). 6 | 7 | ## Currently implemented modbus functions 8 | 9 | + 0x01: Read Coils 10 | + 0x02: Read Discrete Inputs 11 | + 0x03: Read Holding Registers 12 | + 0x04: Read Input Registers 13 | + 0x05: Write Single Coil 14 | + 0x06: Write Single Register 15 | + 0x0F: Write Multiple Coils 16 | + 0x10: Write Multiple Registers 17 | 18 | ## ModbusFunction Class Diagram: 19 | 20 | ![ModbusFunction Class Diagram](./Karonda.ModbusTcp/ModbusFunctionClassDiagram.png) 21 | 22 | ## Blog 23 | 24 | [开源 DotNetty 实现的 Modbus TCP/IP 协议](https://www.cnblogs.com/victorbu/p/10342552.html) 25 | --------------------------------------------------------------------------------