/// <summary>
/// 读取数据的长度
/// </summary>
/// <param name="address"></param>
/// <param name="length"></param>
/// <returns></returns>
public byte[] ReadDataFromPLC(int address, int length, int timeOut)
{
if (!Monitor.TryEnter(_flag))
{
throw new Exception("串口正在执行命令,请稍后");
}
lock (_flag)
{
_dataRecv = null;
if (null != _port && _port.IsOpen)
{
var command = PLCCommandFactory.GetReadCommand(address, length);
_port.Write(command);
Console.WriteLine($"向PLC发送数据");
CommandFactory.PrintBytes(command);
}
else
{
throw new Exception("请先打开串口");
}
var index = 1;
while (index < timeOut)
{
Thread.Sleep(1);
index++;
if (null != _dataRecv && _dataRecv.Length > 1)
{
var newBuffer = new byte[_dataRecv.Length];
Array.Copy(_dataRecv, 0, newBuffer, 0, _dataRecv.Length);
//接受到应答数据
Console.WriteLine($"接受到PLC应答数据:{GetHexString(newBuffer)}");
if ((length * 2) + 4 != newBuffer.Length)
{
throw new Exception("接受到PLC应答数据的长度不对");
}
//对接受到的数据进行解析
//if (!PLCCommandFactory.ValidateData(newBuffer))
//{
// throw new Exception("接受到的数据校验失败");
//}
var datas = new byte[newBuffer.Length - 4];
Array.Copy(newBuffer, 1, datas, 0, datas.Length);
return(HexStrToByteArray(Encoding.ASCII.GetString(datas)));
}
}
throw new Exception("执行命令超时");
}
}
