public static IModbusMessage CreateModbusRequest(ModbusSlave slave, byte[] frame)
{
if (slave == null)
{
throw new ArgumentNullException("slave");
}
if (frame.Length < MinRequestFrameLength)
{
throw new FormatException(String.Format(CultureInfo.InvariantCulture, "Argument 'frame' must have a length of at least {0} bytes.", MinRequestFrameLength));
}
IModbusMessage request;
byte functionCode = frame[1];
// allow custom function override
if (!slave.TryCreateModbusMessageRequest(functionCode, frame, out request))
{
// default implementations
switch (functionCode)
{
case Modbus.ReadCoils:
case Modbus.ReadInputs:
request = CreateModbusMessage <ReadCoilsInputsRequest>(frame);
break;
case Modbus.ReadHoldingRegisters:
case Modbus.ReadInputRegisters:
request = CreateModbusMessage <ReadHoldingInputRegistersRequest>(frame);
break;
case Modbus.WriteSingleCoil:
request = CreateModbusMessage <WriteSingleCoilRequestResponse>(frame);
break;
case Modbus.WriteSingleRegister:
request = CreateModbusMessage <WriteSingleRegisterRequestResponse>(frame);
break;
case Modbus.Diagnostics:
request = CreateModbusMessage <DiagnosticsRequestResponse>(frame);
break;
case Modbus.WriteMultipleCoils:
request = CreateModbusMessage <WriteMultipleCoilsRequest>(frame);
break;
case Modbus.WriteMultipleRegisters:
request = CreateModbusMessage <WriteMultipleRegistersRequest>(frame);
break;
case Modbus.ReadWriteMultipleRegisters:
request = CreateModbusMessage <ReadWriteMultipleRegistersRequest>(frame);
break;
default:
throw new ArgumentException(String.Format(CultureInfo.InvariantCulture, "Unsupported function code {0}", functionCode), "frame");
}
}
return(request);
}
