SerialPort操作串口用ReadByte（）读缓存数据时“操作已超时”
下面是我的代码：using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO.Ports;
using System.Threading;
namespace SerialPortTest
{
public class DriverTest
{
SerialPort sp = new SerialPort();
public string strStatus;
//打开串口 得到数据 关闭串口
#region
/// <summary>
/// 打开串口
/// </summary>
/// <param name="Portname">串口名称</param>
/// <param name="baudRate">串口波特率</param>
/// <returns>打开是否成功</returns>
public bool Open(string Portname, int baudRate)
{
if (!sp.IsOpen)
{
//名称 com1
sp.PortName = Portname;
//波特率 9600或115200
sp.BaudRate = baudRate;
//数据位 8
sp.DataBits = 8;
//奇偶校验 none
sp.Parity = Parity.None;
//停止位 1
sp.StopBits = StopBits.One;
sp.ReadTimeout = 500;
sp.WriteTimeout = 500;
try
{
//打开串口
sp.Open();
}
catch (Exception ex)
{
strStatus = "Open error: " + ex.Message;
return false;
}
strStatus = "Open successfully";
return true;
}
else
{
strStatus = "Open error: Had Opened.";
return false;
}
}
/// <summary>
/// 关闭串口
/// </summary>
/// <returns>关闭是否成功</returns>
public bool Close()
{
if (sp.IsOpen)
{
//关闭串口
try
{
sp.Close();
}
catch (Exception ex)
{
strStatus = "Close Error: " + ex.Message;
return false;
}
strStatus = "Close Sucessfully.";
return true;
}
else
{
strStatus = "Error: port not open.";
return false;
}
}
#endregion
//建立命令
/// <summary>
/// 建立命令
/// </summary>
/// <param name="address">设备地址</param>
/// <param name="command">要建立的命令</param>
private void BuildCommadN1012(byte address, ref byte[] command)
{
//校验位
byte[] CRC = new byte[2];
//设备地址
command[0] = address;
//操作类型 读
command[1] = 0x03;
//DI寄存器地址 0x02 0x00
command[2] = 0x02;
command[3] = 0x00;
//DI数量 0x00 0x10
command[4] = 0x00;
command[5] = 0x10;
GetCRC(command, ref CRC);
command[command.Length - 2] = CRC[0];
command[command.Length - 1] = CRC[1];
}
//建立CRC校验
/// <summary>
/// 建立CRC校验
/// </summary>
/// <param name="command">命令</param>
/// <param name="CRC">校验值</param>
private void GetCRC(byte[] command, ref byte[] CRC)
{
//初始化
ushort CRCFULL = 0xFFFF;
byte CRCH = 0xFF;
byte CRCL = 0xFF;
char CRCLSB;
for (int i = 0; i < command.Length - 2; i++)
{
CRCFULL = (ushort)(CRCFULL ^ command[i]);
for (int j = 0; j < 8; j++)
{
CRCLSB = (char)(CRCFULL & 0x0001);
CRCFULL = (ushort)((CRCFULL >> 1) & 0x7FFF);
if (CRCLSB == 1)
{
CRCFULL = (ushort)(CRCFULL ^ 0xA001);
}
}
}
CRC[1] = CRCH = (byte)((CRCFULL >> 8) & 0xFF);
CRC[0] = CRCL = (byte)(CRCFULL & 0xFF);
}
//得到返回数据
/// <summary>
/// 获取发回数据
/// </summary>
/// <param name="response">返回数据</param>
private void GetResponse(ref byte[] response)
{
if (sp.IsOpen)
{
for (int i = 0; i < response.Length; i++)
{
response[i] = (byte)sp.ReadByte();
}
}
else
{
strStatus = "port not open";
}
}
//检查返回数据
/// <summary>
/// 检查返回数据
/// </summary>
/// <param name="response">返回字节</param>
/// <returns>是否成功</returns>
private bool CheckResponse(byte[] response)
{
byte[] CRC = new byte[2];
//获取CRC校验
GetCRC(response, ref CRC);
if (CRC[0] == response[response.Length - 2] && CRC[1] == response[response.Length - 1])
return true;
else
return false;
}
#region 发送并接收数据 M16
private bool SendGetDataN1012(byte address, ref byte[] response)
{
//检查串口是否打开
if (sp.IsOpen)
{
//清空缓存区
sp.DiscardInBuffer();
sp.DiscardOutBuffer();
//命令字节组
byte[] command = new byte[8];
BuildCommadN1012(address, ref command);
try
{
sp.Write(command, 0, command.Length);
GetResponse(ref response);
if (!CheckResponse(response))
{
return false;
}
}
catch (Exception ex)
{
strStatus = "N1012 Write Error: " + ex.Message;
return false;
}
return true;
}
else
{
strStatus = "port not open";
return false;
}
}
#endregion
private byte[] Convert2ByteTo1Byte(byte[] source)
{
byte[] buffer = new byte[16];
for (int i = 0; i < (source.Length / 2); i++)
{
buffer[i] = source[2 * i];
buffer[i] <<= 8;
buffer[i] += source[2 * i + 1];
}
return buffer;
}
private byte[] ConverN1012SourceData(byte[] source)
{
if (source[1] == 0x03)
{
byte[] buffer = new byte[32];
Array.Copy(source, 3, buffer, 0, 32);
return Convert2ByteTo1Byte(buffer);
}
else
{
return new byte[] { 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15 };
}
}
public byte[,] GetStatusByAddressN1012(int[] iaddress)
{
byte[] response = new byte[37];
byte[] values = new byte[16];
byte[,] buffer = new byte[iaddress.Length, 16];
for (int i = 0; i < iaddress.Length; i++)
{
SendGetDataN1012((byte)iaddress[i], ref response);
values = ConverN1012SourceData(response);
for (int j = 0; j < 16; j++)
{
buffer[i, j] = values[j];
}
Thread.Sleep(20);
}
return buffer;
}
}
}
红色部分是报“操作已超时”异常的部分 --------------------编程问答-------------------- 超时，没有数据发送，等待时间过长 --------------------编程问答-------------------- 是说设备那端没有返回的数据么？等待时间过长貌似不是，我发出一指令后设备的数据灯就立马闪一下，应该网络连接良好，那没返回数据一般是什么原因导致的呢？ --------------------编程问答--------------------
--------------------编程问答-------------------- tangolivesky发的是什么东东？打酱油？ --------------------编程问答-------------------- 没人踩么？跪求大神解答啊，很急 --------------------编程问答-------------------- 不知道楼主问题有没有解决，我现在也遇到了这样的问题，不知是什么原因
public string ZZID
{
get { return getstring(Request.QueryString["zzid"]); }
}
补充：.NET技术 , C#
