/// <summary>
/// 请求获取数据的命令，并且返回请求结果数据的字节数组
/// </summary>
/// <param name="device"></param>
/// <param name="realData"></param>
/// <param name="error"></param>
/// <param name="fragment">当前请求的modbus地址分段</param>
/// <returns></returns>
public Task <List <byte> > RequestData(RealData read)
{
List <byte> allbytes = new List <byte>();
var task = Task.Run <List <byte> >(() =>
{
try
{
if (serialPort != null && serialPort.IsOpen)
{
//分段读取数据，如果是读取整个寄存器的话，一次只能最多读取123个，
//如果是读取线圈的话最大只能读取1999个，因此要分段进行数据的读取
//增加了一个写入后返回消息
master.Transport.WriteMessage = new Action <byte[]>((s) =>
{
if (LogOutput != null)
{
LogOutput(ModbusConvert.ByteToHexStr(s));
}
});
master.Transport.CheckFrame = true;
ModbusFragment fragment = read.Fragment;
switch (fragment.Code)
{
case "01": // 01和05是一个码 可写可读
{
//返回的线圈状态,由于线圈是按位操作，转换也是按位转换
Task <bool[]> result = master.ReadCoilsAsync(byte.Parse(read.Address), fragment.StartRegister, fragment.RegisterNum);
byte[] bytes = ModbusConvert.BoolToByte(result.Result);
allbytes.AddRange(bytes);
}
break;
case "02": //只读属性
{
//返回的线圈状态
Task <bool[]> result = master.ReadInputsAsync(byte.Parse(read.Address), fragment.StartRegister, fragment.RegisterNum);
byte[] bytes = ModbusConvert.BoolToByte(result.Result);
allbytes.AddRange(bytes);
}
break;
case "03": //HR保持寄存器，可写可读
{
//返回的数据全部是ushort 需要将ushort 转换为byte在进行传递
Task <ushort[]> result = master.ReadHoldingRegistersAsync(byte.Parse(read.Address), fragment.StartRegister, fragment.RegisterNum);
byte[] bytes = ModbusConvert.Ushorts2Bytes(result.Result);
allbytes.AddRange(bytes);
}
break;
case "04": //只读属性
{
//返回的数据全部是ushort 需要将ushort 转换为byte在进行传递
Task <ushort[]> result = master.ReadInputRegistersAsync(byte.Parse(read.Address), fragment.StartRegister, fragment.RegisterNum);
byte[] bytes = ModbusConvert.Ushorts2Bytes(result.Result);
allbytes.AddRange(bytes);
}
break;
}
}
return(allbytes);
}
catch
{
return(allbytes);
}
});
return(task);
}
