public static IModbusCommand Parse(byte[] request, int offset)
{
var slave = request[offset + 0];
var code = request[offset + 1];
var address = ModbusHelper.GetUShort(request, offset + 2);
switch (code)
{
case 1:
return(Parse01(slave, code, address, request, offset));
case 2:
return(Parse02(slave, code, address, request, offset));
case 3:
return(Parse03(slave, code, address, request, offset));
case 4:
return(Parse04(slave, code, address, request, offset));
case 5:
return(Parse05(slave, code, address, request, offset));
case 6:
return(Parse06(slave, code, address, request, offset));
case 15:
return(Parse15(slave, code, address, request, offset));
case 16:
return(Parse16(slave, code, address, request, offset));
}
throw Tools.Make("Unsupported function code {0}", code);
}
public object ParseResponse(byte[] response, int offset)
{
Assert.Equal(ModbusHelper.GetUShort(response, offset + 0), transactionId, "TransactionId mismatch {0} {1}");
Assert.Equal(ModbusHelper.GetUShort(response, offset + 2), 0, "Zero mismatch {0} {1}");
Assert.Equal(ModbusHelper.GetUShort(response, offset + 4), wrapped.ResponseLength, "Length mismatch {0} {1}");
return(wrapped.ParseResponse(response, offset + 6));
}
public void FillRequest(byte[] request, int offset)
{
wrapped.FillRequest(request, offset);
var crc = ModbusHelper.CRC16(request, offset, wrapped.RequestLength);
request[offset + wrapped.RequestLength + 0] = ModbusHelper.Low(crc);
request[offset + wrapped.RequestLength + 1] = ModbusHelper.High(crc);
}
public void FillResponse(byte[] response, int offset, object value)
{
wrapped.FillResponse(response, offset, value);
var crc = ModbusHelper.CRC16(response, offset, wrapped.ResponseLength);
response[offset + wrapped.ResponseLength + 0] = ModbusHelper.Low(crc);
response[offset + wrapped.ResponseLength + 1] = ModbusHelper.High(crc);
}
public object ParseResponse(byte[] response, int offset)
{
Tools.AssertEqual(response[offset + 0], slave, "Slave mismatch got {0} expected {1}");
Tools.AssertEqual(response[offset + 1], 16, "Function mismatch got {0} expected {1}");
Tools.AssertEqual(ModbusHelper.GetUShort(response, offset + 2), address, "Address mismatch got {0} expected {1}");
Tools.AssertEqual(ModbusHelper.GetUShort(response, offset + 4), values.Length, "Register count mismatch got {0} expected {1}");
return(null);
}
public void FillRequest(byte[] request, int offset)
{
FillResponse(request, offset, null);
var bytes = ModbusHelper.EncodeWords(values);
request[offset + 6] = (byte)bytes.Length;
ModbusHelper.Copy(bytes, 0, request, offset + 7, bytes.Length);
}
public object ParseResponse(byte[] response, int offset)
{
Assert.Equal(response[offset + 0], slave, "Slave mismatch {0} expected:{1}");
Assert.Equal(response[offset + 1], 15, "Function mismatch {0} expected:{1}");
Assert.Equal(ModbusHelper.GetUShort(response, offset + 2), address, "Address mismatch {0} expected:{1}");
Assert.Equal(ModbusHelper.GetUShort(response, offset + 4), values.Length, "Coil count mismatch {0} expected:{1}");
return(null);
}
public object ParseResponse(byte[] response, int offset)
{
Assert.Equal(response[offset + 0], slave, "Slave mismatch got {0} expected {1}");
Assert.Equal(response[offset + 1], 6, "Function mismatch got {0} expected {1}");
Assert.Equal(ModbusHelper.GetUShort(response, offset + 2), address, "Address mismatch got {0} expected {1}");
Assert.Equal(ModbusHelper.GetUShort(response, offset + 4), value, "Value mismatch got {0} expected {1}");
return(null);
}
private static IModbusCommand Parse05(byte slave, byte code, ushort address, byte[] request, int offset)
{
var value = ModbusHelper.DecodeBool(request[offset + 4]);
var zero = request[offset + 5];
Tools.AssertEqual(zero, 0, "Zero mismatch got {0} expected {1}");
return(new ModbusF05WriteCoil(slave, address, value));
}
public object ParseResponse(byte[] response, int offset)
{
Assert.Equal(response[offset + 0], slave, "Slave mismatch {0} expected:{1}");
Assert.Equal(response[offset + 1], 5, "Function mismatch {0} expected:{1}");
Assert.Equal(ModbusHelper.GetUShort(response, offset + 2), address, "Address mismatch {0} expected:{1}");
Assert.Equal(response[offset + 4], ModbusHelper.EncodeBool(value), "Value mismatch {0} expected:{1}");
Assert.Equal(response[offset + 5], 0, "Pad mismatch {0} expected:{1}");
return(null);
}
public void FillRequest(byte[] request, int offset)
{
request[offset + 0] = slave;
request[offset + 1] = 5;
request[offset + 2] = ModbusHelper.High(address);
request[offset + 3] = ModbusHelper.Low(address);
request[offset + 4] = ModbusHelper.EncodeBool(value);
request[offset + 5] = 0;
}
public void FillResponse(byte[] response, int offset, object value)
{
response[offset + 0] = slave;
response[offset + 1] = 16;
response[offset + 2] = ModbusHelper.High(address);
response[offset + 3] = ModbusHelper.Low(address);
response[offset + 4] = ModbusHelper.High(values.Length);
response[offset + 5] = ModbusHelper.Low(values.Length);
}
public IModbusWrapper Parse(byte[] request, int offset)
{
var wrapped = ModbusParser.Parse(request, offset + 6);
Assert.Equal(wrapped.RequestLength, ModbusHelper.GetUShort(request, offset + 4), "RequestLength mismatch {0} expected:{1}");
var transaction = ModbusHelper.GetUShort(request, offset);
return(new ModbusTCPWrapper(wrapped, transaction));
}
public IModbusWrapper Parse(byte[] request, int offset)
{
var wrapped = ModbusParser.Parse(request, offset);
var crc = ModbusHelper.CRC16(request, offset, wrapped.RequestLength);
Assert.Equal(crc, ModbusHelper.GetUShortLittleEndian(request, offset + wrapped.RequestLength),
"CRC mismatch {0:X4} expected {1:X4}");
return(new ModbusRTUWrapper(wrapped));
}
private static IModbusCommand Parse15(byte slave, byte code, ushort address, byte[] request, int offset)
{
var count = ModbusHelper.GetUShort(request, offset + 4);
var values = ModbusHelper.DecodeBools(request, offset + 7, count);
var bytes = request[offset + 6];
Assert.Equal(ModbusHelper.BytesForBools(count), bytes, "Byte count mismatch {0} expected:{1}");
return(new ModbusF15WriteCoils(slave, address, values));
}
public object ParseResponse(byte[] response, int offset)
{
var bytes = ModbusHelper.BytesForWords(count);
Tools.AssertEqual(response[offset + 0], slave, "Slave mismatch got {0} expected {1}");
Tools.AssertEqual(response[offset + 1], 4, "Function mismatch got {0} expected {1}");
Tools.AssertEqual(response[offset + 2], bytes, "Bytes mismatch got {0} expected {1}");
return(ModbusHelper.DecodeWords(response, offset + 3, count));
}
public void FillRequest(byte[] request, int offset)
{
request[offset + 0] = slave;
request[offset + 1] = 1;
request[offset + 2] = ModbusHelper.High(address);
request[offset + 3] = ModbusHelper.Low(address);
request[offset + 4] = ModbusHelper.High(count);
request[offset + 5] = ModbusHelper.Low(count);
}
public object ParseResponse(byte[] response, int offset)
{
var bytes = ModbusHelper.BytesForBools(count);
Assert.Equal(response[offset + 0], slave, "Slave mismatch {0} expected:{1}");
Assert.Equal(response[offset + 1], 1, "Function mismatch {0} expected:{1}");
Assert.Equal(response[offset + 2], bytes, "Bytes mismatch {0} expected:{1}");
return(ModbusHelper.DecodeBools(response, offset + 3, count));
}
private static IModbusCommand Parse16(byte slave, byte code, ushort address, byte[] request, int offset)
{
var count = ModbusHelper.GetUShort(request, offset + 4);
var values = ModbusHelper.DecodeWords(request, offset + 7, count);
var bytes = request[offset + 6];
Tools.AssertEqual(ModbusHelper.BytesForWords(count), bytes, "Byte count mismatch got {0} expected {1}");
return(new ModbusF16WriteRegisters(slave, address, values));
}
public object ParseResponse(byte[] response, int offset)
{
var crc1 = ModbusHelper.CRC16(response, offset, wrapped.ResponseLength);
//crc is little endian page 13 http://modbus.org/docs/Modbus_over_serial_line_V1_02.pdf
var crc2 = ModbusHelper.GetUShortLittleEndian(response, offset + wrapped.ResponseLength);
Tools.AssertEqual(crc2, crc1, "CRC mismatch got {0:X4} expected {1:X4}");
return(wrapped.ParseResponse(response, offset));
}
public void FillResponse(byte[] response, int offset, object value)
{
response[offset + 0] = ModbusHelper.High(transactionId);
response[offset + 1] = ModbusHelper.Low(transactionId);
response[offset + 2] = 0;
response[offset + 3] = 0;
response[offset + 4] = ModbusHelper.High(wrapped.ResponseLength);
response[offset + 5] = ModbusHelper.Low(wrapped.ResponseLength);
wrapped.FillResponse(response, offset + 6, value);
}
public void FillRequest(byte[] request, int offset)
{
request[offset + 0] = ModbusHelper.High(transactionId);
request[offset + 1] = ModbusHelper.Low(transactionId);
request[offset + 2] = 0;
request[offset + 3] = 0;
request[offset + 4] = ModbusHelper.High(wrapped.RequestLength);
request[offset + 5] = ModbusHelper.Low(wrapped.RequestLength);
wrapped.FillRequest(request, offset + 6);
}
public void FillResponse(byte[] response, int offset, object value)
{
var bytes = ModbusHelper.BytesForBools(count);
response[offset + 0] = slave;
response[offset + 1] = 1;
response[offset + 2] = bytes;
var data = ModbusHelper.EncodeBools((bool[])value);
ModbusHelper.Copy(data, 0, response, offset + 3, bytes);
}
public void FillResponse(byte[] response, int offset, object value)
{
var bytes = ModbusHelper.BytesForWords(count);
response[offset + 0] = slave;
response[offset + 1] = 4;
response[offset + 2] = bytes;
var data = ModbusHelper.EncodeWords(value as ushort[]);
ModbusHelper.Copy(data, 0, response, offset + 3, bytes);
}
public byte[] GetException(byte code)
{
var exception = new byte[5];
exception[0] = wrapped.Slave;
exception[1] = (byte)(wrapped.Code | 0x80);
exception[2] = code;
var crc = ModbusHelper.CRC16(exception, 0, 3);
exception[3] = ModbusHelper.Low(crc);
exception[4] = ModbusHelper.High(crc);
return(exception);
}
public IModbusWrapper Scan()
{
if (buffer.Count >= 6)
{
var length = ModbusHelper.GetUShort(buffer[4], buffer[5]);
if (buffer.Count >= 6 + length)
{
var request = buffer.GetRange(0, 6 + length).ToArray();
buffer.RemoveRange(0, 6 + length);
return(protocol.Parse(request, 0));
}
}
return(null);
}
public byte[] GetException(byte code)
{
var exception = new byte[9];
exception[0] = ModbusHelper.High(transactionId);
exception[1] = ModbusHelper.Low(transactionId);
exception[2] = 0;
exception[3] = 0;
exception[4] = ModbusHelper.High(3);
exception[5] = ModbusHelper.Low(3);
exception[6 + 0] = wrapped.Slave;
exception[6 + 1] = (byte)(wrapped.Code | 0x80);
exception[6 + 2] = code;
return(exception);
}
public void CheckException(byte[] response, int count)
{
if (count < 5)
{
Tools.Throw("Partial exception packet got {0} expected >= {1}", count, 5);
}
var offset = 0;
var code = response[offset + 1];
if ((code & 0x80) != 0)
{
Tools.AssertEqual(response[offset + 0], wrapped.Slave, "Slave mismatch got {0} expected {1}");
Tools.AssertEqual(code & 0x7F, wrapped.Code, "Code mismatch got {0} expected {1}");
var crc1 = ModbusHelper.CRC16(response, offset, 3);
//crc is little endian page 13 http://modbus.org/docs/Modbus_over_serial_line_V1_02.pdf
var crc2 = ModbusHelper.GetUShortLittleEndian(response, offset + 3);
Tools.AssertEqual(crc2, crc1, "CRC mismatch got {0:X4} expected {1:X4}");
throw new ModbusException(response[offset + 2]);
}
}
private static IModbusCommand Parse04(byte slave, byte code, ushort address, byte[] request, int offset)
{
var count = ModbusHelper.GetUShort(request, offset + 4);
return(new ModbusF04ReadInputRegisters(slave, address, count));
}
private static IModbusCommand Parse06(byte slave, byte code, ushort address, byte[] request, int offset)
{
var value = ModbusHelper.GetUShort(request, offset + 4);
return(new ModbusF06WriteRegister(slave, address, value));
}