1、协议

电表有个电力行业推荐标准《DLT645-2007多功能电能表通信协议》，电表都支持，通过该协议读取数据，不同的电表不需要考虑编码格式、数据地址、高低位转换等复杂情况，统一采集。

不方便的地方在于这个协议定义得有点小复杂，自己带有各种特殊性定义，编程时一堆的坑。

不少电表可以同时支持DLT645-2007和MODBUS RTU协议，但MODBUS协议在不同的电表中，地址都是不同的，需要查阅手册才能搞定。

DLT645不同的数据需要发送独立的请求，而Modbus数据地址连接的可以一次读取，各有所长和优势。

2、协议定义和报文

      协议定义和报文，在协议文档中有详细说明，主要部分节选如下：

3、数据域定义

         协议中对每个数据都定义了明确的地址和解析格式，如：

比如 00 00 00 00表示组合有功总电能。同一组的可以使用FF通配，表示读取整块的数据，00 00 FF 00表示一次读取 00 00 00 00 ~ 00 00 3F 00的所有数据。

 但需要注意的事，不是所有电表都支持块数据读取。

4、编码验证

    public class DLT645_2007{public enum CommandType{ReadData = 0x11,WriteData = 0x14,ReadAddress = 0x13,WriteAddress = 0x15}public class Dlt645Addr{public string dataIndentifier;public int dataLen;public float divisor = 1.0f;public string unit;public string dataItemName;public string dataName;public string PascalType;public Dlt645Addr(string dataIndentifier, int dataLen, float divisor, string unit, string dataItemName, string dataName= "", string PascalType = "FLOAT"){this.dataIndentifier = dataIndentifier;this.dataLen = dataLen;this.divisor = divisor;this.unit = unit;this.dataItemName = dataItemName;this.dataName = dataName;this.PascalType = PascalType;}}public Dlt645Addr []addrList ={//电能量new Dlt645Addr("00010000",4,100,"V" ,"正向有功总电量","Forth_Have_Power_Total"),// R4new Dlt645Addr("00010100",4,100,"V" ,"正向有功尖电量","Forth_Have_Power_SPIKE"),// R4 以上四个名称待核实new Dlt645Addr("00010200",4,100,"V" ,"正向有功峰电量","Forth_Have_Power_PEAK"),// R4new Dlt645Addr("00010300",4,100,"V" ,"正向有功平电量","Forth_Have_Power_FLAT"),// R4new Dlt645Addr("00010400",4,100,"V" ,"正向有功谷电量","Forth_Have_Power_VALLEY"),// R4//变量数据new Dlt645Addr("02010100",2,  10,"V","A项电压","Phase_A_Volt"),// R2new Dlt645Addr("02010200",2,  10,"V","B项电压","Phase_B_Volt"),// R2new Dlt645Addr("02010300",2,  10,"V","C项电压","Phase_C_Volt"),// R2new Dlt645Addr("02020100",3,1000,"A","A项电流","Phase_A_Elec"),// R3new Dlt645Addr("02020200",3,1000,"A","B项电流","Phase_B_Elec"),// R3new Dlt645Addr("02020300",3,1000,"A","C项电流","Phase_C_Elec"),// R3new Dlt645Addr("02030000",3,1000,"kW","瞬时总有功率功率","Instant_Have_Power_Rate_Total"),// R3new Dlt645Addr("02030000",3,1000,"kW","瞬时A相有功率功率","Instant_Phase_A_Have_Power_Rate"),// R3new Dlt645Addr("02030000",3,1000,"kW","瞬时B相有功率功率","Instant_Phase_B_Have_Power_Rate"),// R3new Dlt645Addr("02030000",3,1000,"kW","瞬时C相有功率功率","Instant_Phase_C_Have_Power_Rate"),// R3new Dlt645Addr("02040000",3,1000,"kwar","瞬时总无功率功率","Instant_None_Power_Rate_Total"),// R3new Dlt645Addr("02040000",3,1000,"kwar","瞬时A相无功率功率","Instant_Phase_A_None_Power_Rate"),// R3new Dlt645Addr("02040000",3,1000,"kwar","瞬时B相无功率功率","Instant_Phase_B_None_Power_Rate"),// R3new Dlt645Addr("02040000",3,1000,"kwar","瞬时C相无功率功率","Instant_Phase_C_None_Power_Rate"),// R3new Dlt645Addr("02050000",3,1000,"kVA","瞬时总视在功率","Instant_Apparent_Power_Rate_Total"),// R3new Dlt645Addr("02050000",3,1000,"kVA","瞬时A相视在功率","Instant_Phase_A_Apparent_Power_Rate"),// R3new Dlt645Addr("02050000",3,1000,"kVA","瞬时B相视在功率","Instant_Phase_B_Apparent_Power_Rate"),// R3new Dlt645Addr("02050000",3,1000,"kVA","瞬时C相视在功率","Instant_Phase_C_Apparent_Power_Rate"),// R3new Dlt645Addr("02060000",2,1000,"","总功率因数","Power_Rate_Factor_Total"),// R2new Dlt645Addr("02060100",2,1000,"","A相功率因数","Phase_A_Power_Rate_Factor"),// R2new Dlt645Addr("02060200",2,1000,"","B相功率因数","Phase_B_Power_Rate_Factor"),// R2new Dlt645Addr("02060300",2,1000,"","C相功率因数","Phase_C_Power_Rate_Factor"),// R2new Dlt645Addr("02070100",2,  10,"V","A相相角","Phase_A_Angle"),// R2new Dlt645Addr("02070200",2,  10,"V","B相相角","Phase_B_Angle"),// R2new Dlt645Addr("02070300",2,  10,"V","C相相角","Phase_C_Angle"),// R2new Dlt645Addr("02080100",2, 100,"%","A相电压波形失真度","Phase_A_Volt_Waveform_Distortion"),// R2new Dlt645Addr("02080200",2, 100,"%","B相电压波形失真度","Phase_B_Volt_Waveform_Distortion"),// R2new Dlt645Addr("02080300",2, 100,"%","C相电压波形失真度","Phase_C_Volt_Waveform_Distortion"),// R2new Dlt645Addr("02090100",2, 100,"%","A相电流波形失真度","Phase_A_Elec_Waveform_Distortion"),// R2new Dlt645Addr("02090200",2, 100,"%","B相电流波形失真度","Phase_B_Elec_Waveform_Distortion"),// R2new Dlt645Addr("02090300",2, 100,"%","C相电流波形失真度","Phase_C_Elec_Waveform_Distortion")// R2//最大需量//事件记录数//负荷记录//参变量//安全认证};Dictionary<string,Dlt645Addr> dictAddr = new Dictionary<string, Dlt645Addr> ();//是否需要唤醒 ,0xFEprivate bool isNeedWakeUp = false;// 创建串口对象SerialPort serialPort = null;int rxCount = 0;byte[] rxdata = new byte[512];Stopwatch swRead = new Stopwatch ();public DLT645_2007(){foreach(var addr in addrList){dictAddr[addr.dataIndentifier] = addr; }}//SerialPort("COM3", 9600, Parity.None, 8, StopBits.One);public bool OpenDevice(string portName, int baudRate= 2400, Parity parity = Parity.None, int dataBits=8, StopBits stopBits = StopBits.One){try{serialPort = new SerialPort(portName, baudRate, parity, dataBits, stopBits);serialPort.Open();serialPort.ReadTimeout = 500;serialPort.DataReceived += SerialPort_DataReceived;return true;}catch(Exception ex){return false;}}private void SerialPort_DataReceived(object sender, SerialDataReceivedEventArgs e){byte[] rxTemp = new byte[1024];int rdCount = serialPort.Read(rxTemp, 0, rxTemp.Length);if (rdCount > 0){for(int  i = 0; i < rdCount; i++){if (rxTemp[i] == 0xfe)continue;rxdata[rxCount++] = rxTemp[i];if (rxTemp[i] == 0x16){ParseData();}}}swRead.Stop();}public void ParseDataTest(string data){data = data.Replace(" ", "");rxCount = data.Length;for(int i = 0; i < rxCount;i+=2){rxdata[i/2] = Convert.ToByte(data.Substring(i, 2), 16);}ParseData();}private void ParseData(){//校验和标识检查if(rxCount < 9 || rxdata[0] != 0x68 || rxdata[7] != 0x68){Console.WriteLine($"校验和标识检查失败，len:{rxCount},{rxdata[0]:X},{rxdata[7]:X}");rxCount = 0;return;}//响应命令检查if (rxdata[8] != 0x91 && rxdata[8] != 0xB1 ){Console.WriteLine($"响应命令检查失败，{rxdata[8]:X}");rxCount = 0;return;}string addrT = BitConverter.ToString(rxdata, 1, 6).Replace("-","");string addr = addrT.Substring(8,2)+ addrT.Substring(6, 2) + addrT.Substring(4, 2) + addrT.Substring(2, 2) + addrT.Substring(0, 2);string value = "";int dataLen = rxdata[9];for(int k = 0; k < dataLen; k++){rxdata[10 + k] -= 0x33;value += string.Format("{0:X2}", rxdata[10 + k]);}string index = value.Substring(6, 2)+ value.Substring(4, 2)+ value.Substring(2, 2)+ value.Substring(0, 2);var dlt645 = dictAddr[index];string value2 = "";for(int k = dlt645.dataLen-1; k >= 0; k --){value2 += value.Substring(8 + k * 2, 2);}float fv = float.Parse(value2); Console.WriteLine($"表号:{addr},{dlt645.dataItemName},{dlt645.dataIndentifier},{fv/dlt645.divisor} [{dlt645.unit}]");rxCount = 0;}public void CloseDevice(){serialPort.Close();serialPort = null;}public void Read(List<string> addrMeter, string data){if (isNeedWakeUp){byte[] reqHe = { 0xFE, 0xFE };serialPort.Write(reqHe, 0, reqHe.Length);}byte []req = BuildRequest(addrMeter[0], data, CommandType.ReadData);serialPort.Write(req,0,req.Length);swRead.Restart();}public byte[] BuildRequest(string addrMeter, string data, CommandType commandType){// 构建请求帧byte[] request = new byte[12 + 4];int index = 0;request[index++] = 0x68;  // 帧起始符 68H//地址域 A0~A5，地址域是用来表示电表地址，低位在前，高位在后request[index++] = Convert.ToByte(addrMeter.Substring(10, 2), 16);  // 地址域 A0request[index++] = Convert.ToByte(addrMeter.Substring(8, 2), 16);  // 地址域 A1request[index++] = Convert.ToByte(addrMeter.Substring(6, 2), 16);  // 地址域 A2request[index++] = Convert.ToByte(addrMeter.Substring(4, 2), 16);  // 地址域 A3request[index++] = Convert.ToByte(addrMeter.Substring(2, 2), 16);  // 地址域 A4request[index++] = Convert.ToByte(addrMeter.Substring(0, 2), 16);  // 地址域 A5request[index++] = 0x68;  // 帧起始符request[index++] = 0x11;  // 控制码request[index++] = (byte)(4);// Convert.ToByte((data.Count * 4).ToString(), 16);  // 数据域长度for (int i = 3;i >=0; i --){string sV = data.Substring(i*2, 2);if (sV.Equals("FF")){request[index++] = 0xff;}else{request[index++] = (byte)(Convert.ToByte(sV, 16) + 0x33);  // 数据}}byte crc = GetCRC(request, 0, request.Length-2);  // 校验码request[index++] = Convert.ToByte(crc.ToString("X"), 16);request[index++] = 0x16;  // 结束符return request;}private byte GetCRC(byte[] data, int start, int length){int I = 0;for (int k = 0; k < length; k++){I += data[start + k];}return (byte)(I % 256);}}