86 lines
3.5 KiB
C#
86 lines
3.5 KiB
C#
using System;
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namespace SharpModbus
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{
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public class ModbusRTUWrapper : IModbusWrapper
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{
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private readonly IModbusCommand wrapped;
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public byte Code { get { return wrapped.Code; } }
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public byte Slave { get { return wrapped.Slave; } }
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public ushort Address { get { return wrapped.Address; } }
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public IModbusCommand Wrapped { get { return wrapped; } }
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public int RequestLength { get { return wrapped.RequestLength + 2; } }
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public int ResponseLength { get { return wrapped.ResponseLength + 2; } }
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public ModbusRTUWrapper(IModbusCommand wrapped)
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{
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this.wrapped = wrapped;
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}
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public void FillRequest(byte[] request, int offset)
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{
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wrapped.FillRequest(request, offset);
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var crc = ModbusUtils.CRC16(request, offset, wrapped.RequestLength);
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request[offset + wrapped.RequestLength + 0] = ModbusUtils.Low(crc);
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request[offset + wrapped.RequestLength + 1] = ModbusUtils.High(crc);
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}
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public object ParseResponse(byte[] response, int offset)
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{
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var crc1 = ModbusUtils.CRC16(response, offset, wrapped.ResponseLength);
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//crc is little endian page 13 http://modbus.org/docs/Modbus_over_serial_line_V1_02.pdf
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var crc2 = ModbusUtils.GetUShortLittleEndian(response, offset + wrapped.ResponseLength);
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Tools.AssertEqual(crc2, crc1, "CRC mismatch got {0:X4} expected {1:X4}");
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return wrapped.ParseResponse(response, offset);
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}
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public object ApplyTo(IModbusModel model)
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{
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return wrapped.ApplyTo(model);
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}
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public void FillResponse(byte[] response, int offset, object value)
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{
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wrapped.FillResponse(response, offset, value);
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var crc = ModbusUtils.CRC16(response, offset, wrapped.ResponseLength);
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response[offset + wrapped.ResponseLength + 0] = ModbusUtils.Low(crc);
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response[offset + wrapped.ResponseLength + 1] = ModbusUtils.High(crc);
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}
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public byte[] GetException(byte code)
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{
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var exception = new byte[5];
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exception[0] = wrapped.Slave;
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exception[1] = (byte)(wrapped.Code | 0x80);
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exception[2] = code;
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var crc = ModbusUtils.CRC16(exception, 0, 3);
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exception[3] = ModbusUtils.Low(crc);
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exception[4] = ModbusUtils.High(crc);
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return exception;
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}
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public void CheckException(byte[] response, int count)
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{
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if (count < 5) Tools.Throw("Partial packet exception got {0} expected >= {1}", count, 5);
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var offset = 0;
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var code = response[offset + 1];
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if ((code & 0x80) != 0)
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{
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Tools.AssertEqual(response[offset + 0], wrapped.Slave, "Slave mismatch got {0} expected {1}");
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Tools.AssertEqual(code & 0x7F, wrapped.Code, "Code mismatch got {0} expected {1}");
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var crc1 = ModbusUtils.CRC16(response, offset, 3);
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//crc is little endian page 13 http://modbus.org/docs/Modbus_over_serial_line_V1_02.pdf
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var crc2 = ModbusUtils.GetUShortLittleEndian(response, offset + 3);
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Tools.AssertEqual(crc2, crc1, "CRC mismatch got {0:X4} expected {1:X4}");
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throw new ModbusException(response[offset + 2]);
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}
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}
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public override string ToString()
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{
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return string.Format("[ModbusRTUWrapper Wrapped={0}]", wrapped);
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}
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}
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}
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