上位机与三菱FX3U通过FX-232-BD通信

PLC侧设置：

和校验+协议4

读D200单字： 05 30 30 46 46 57 52 30 44 30 32 30 30 30 31     返回“201”：02 30 30 46 46 30 30 43 39 03

         private void ReadOrder(string Add)
         {
             Byte[] sendData = new Byte[];
             sendData[] = 0x05;           //ENQ
             sendData[] = 0x30;           //站号
             sendData[] = 0x30;
             sendData[] = 0x46;           //PC号
             sendData[] = 0x46;
             sendData[] = 0x57;           //命令  “WR” 57 52
             sendData[] = 0x52;
             sendData[] = 0x30;           //报文等待
             sendData[] = (byte)Convert.ToChar(Add[]);          //起始软元件 “D0200”
             sendData[] = (byte)Convert.ToChar(Add[]);
             sendData[] = (byte)Convert.ToChar(Add[]);
             sendData[] = (byte)Convert.ToChar(Add[]);
             sendData[] = (byte)Convert.ToChar(Add[]);
             sendData[] = 0x30;           //软元件点数  默认“01”
             sendData[] = 0x31;
             int allInt = ;
             for (int i = ; i <= ; i++)
             {
                 allInt += (int)sendData[i];  //进行和校验
             }
             string allStrX = allInt.ToString("X");  //转换成十六进制
             sendData[] = (byte)Convert.ToChar(allStrX.Substring(allStrX.Length - , ));  //提取十六进制倒数第二位的ASCII值
             sendData[] = (byte)Convert.ToChar(allStrX.Substring(allStrX.Length - , ));  //提取十六进制倒数第一位的ASCII值
             sendData[] = 0x0D;         //CR
             sendData[] = 0x0A;         //LF
             this.PLC_SendData(sendData);
         }

读取命令

写1到D100： 05 30 30 46 46 57 57 30 44 30 31 30 30 30 31 30 30 30 31    返回：06 30 30 46 46

         private void WriteOrder(string Add,string Con)
         {
             Byte[] sendData = new Byte[];
             sendData[] = 0x05;           //ENQ
             sendData[] = 0x30;           //站号
             sendData[] = 0x30;
             sendData[] = 0x46;           //PC号
             sendData[] = 0x46;
             sendData[] = 0x57;           //命令  “WR” 57 57
             sendData[] = 0x57;
             sendData[] = 0x30;           //报文等待
             sendData[] = (byte)Convert.ToChar(Add[]);          //起始软元件 “D0100”
             sendData[] = (byte)Convert.ToChar(Add[]);
             sendData[] = (byte)Convert.ToChar(Add[]);
             sendData[] = (byte)Convert.ToChar(Add[]);
             sendData[] = (byte)Convert.ToChar(Add[]);
             sendData[] = 0x30;           //软元件点数  默认“01”
             sendData[] = 0x31;
             sendData[] = (byte)Convert.ToChar(Con[]);          //内容 “0001”
             sendData[] = (byte)Convert.ToChar(Con[]);
             sendData[] = (byte)Convert.ToChar(Con[]);
             sendData[] = (byte)Convert.ToChar(Con[]);
             int allInt = ;
             for (int i = ; i <= ; i++)
             {
                 allInt += (int)sendData[i];  //进行和校验
             }
             string allStrX = allInt.ToString("X");  //转换成十六进制
             sendData[] = (byte)Convert.ToChar(allStrX.Substring(allStrX.Length - , ));  //提取十六进制倒数第二位的ASCII值
             sendData[] = (byte)Convert.ToChar(allStrX.Substring(allStrX.Length - , ));  //提取十六进制倒数第一位的ASCII值
             sendData[] = 0x0D;         //CR
             sendData[] = 0x0A;         //LF
             this.PLC_SendData(sendData);
         }

写入命令