55 lines
1.7 KiB
C#
55 lines
1.7 KiB
C#
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using InnovEnergy.Lib.Protocols.Modbus.Protocol.Frames.Accessors;
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namespace InnovEnergy.Lib.Protocols.Modbus.Protocol.Frames;
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using Fc = FunctionCode;
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public class ModbusFrame
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{
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internal const Int32 MinSize = 2;
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public ArraySegment<Byte> Data { get; }
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public MbByte SlaveAddress => Data.ByteAt(0);
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public MbByte<FunctionCode> FunctionCode => Data.ByteAt<FunctionCode>(1);
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internal ModbusFrame(Int32 size)
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{
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Data = new ArraySegment<Byte>(new Byte[size]);
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}
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internal ModbusFrame(ArraySegment<Byte> data)
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{
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if (data.Count < MinSize) throw new ArgumentException(nameof(data));
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Data = data;
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}
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protected void AssertFunctionCode(FunctionCode expectedFc)
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{
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var actualFc = FunctionCode.Get();
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if (actualFc == (expectedFc | Fc.Error))
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throw new ErrorResponseException(ExceptionCode.IllegalDataValue, actualFc); // TODO parse exception code
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if (actualFc != expectedFc)
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throw new UnexpectedResponseFieldException(field: nameof(FunctionCode),
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expected: expectedFc.ToString(),
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actual: Enum.GetName(typeof(FunctionCode), actualFc)!);
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}
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public void AssertSlaveAddress(Byte expectedSlaveAddress)
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{
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var actualSlaveAddress = SlaveAddress.Get();
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if (actualSlaveAddress != expectedSlaveAddress)
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throw new UnexpectedResponseFieldException(field: nameof(SlaveAddress),
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expected: expectedSlaveAddress,
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actual: actualSlaveAddress);
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}
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}
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