C#基于NModbus实现MODBUSTCP字符串、浮点数读写
引用NModbus
在NuGet搜索NModbus，添加引用。
封装ModbusTcp类
public class ModbusTCP { private ModbusFactory modbusFactory; private IModbusMaster master; private TcpClient tcpClient; public string IPAdress { get; set; } public int Port { get; set; } public bool Connected { get => tcpClient.Connected; } public ModbusTCP(string ip, int port) { IPAdress = ip; Port = port; modbusFactory = new ModbusFactory(); tcpClient = new TcpClient(IPAdress, Port); master = modbusFactory.CreateMaster(tcpClient); master.Transport.ReadTimeout = 2000; master.Transport.Retries = 10; } public bool[] ReadCoils(byte slaveAddress, ushort startAddress, ushort num) { return master.ReadCoils(slaveAddress, startAddress, num); } public bool[] ReadInputs(byte slaveAddress, ushort startAddress, ushort num) { return master.ReadInputs(slaveAddress, startAddress, num); } public ushort[] ReadHoldingRegisters(byte slaveAddress, ushort startAddress, ushort num) { return master.ReadHoldingRegisters(slaveAddress, startAddress, num); } public ushort[] ReadInputRegisters(byte slaveAddress, ushort startAddress, ushort num) { return master.ReadInputRegisters(slaveAddress, startAddress, num); } public void WriteSingleCoil(byte slaveAddress, ushort startAddress, bool value) { master.WriteSingleCoil(slaveAddress, startAddress, value); } public void WriteSingleRegister(byte slaveAddress, ushort startAddress, ushort value) { master.WriteSingleRegister(slaveAddress, startAddress, value); } public void WriteMultipleCoils(byte slaveAddress, ushort startAddress, bool[] value) { master.WriteMultipleCoils(slaveAddress, startAddress, value); } public void WriteMultipleRegisters(byte slaveAddress, ushort startAddress, ushort[] value) { master.WriteMultipleRegisters(slaveAddress, startAddress, value); } }连接测试
下载 Modbus Slave
链接：https://pan.baidu.com/s/1ydX_9KElkOTA7h-E3SIadw
提取码：7fh5
设置
连接
private ModbusTCP modbus; private void ConnectExecute() { try { modbus = new ModbusTCP(IP, Port); pollingTimer.Start(); } catch (Exception ex) { Msg.Info(ex.Message); } }写入测试
NModbus提供的对寄存器读写方法，只包括ushort类型，需要对ushort进行进行转换。
封装转换类型
public class MODBUS { /// <summary> /// 赋值string /// </summary> /// <param name="src"></param> /// <param name="start"></param> /// <param name="value"></param> /// <returns></returns> public static void SetString(ushort[] src, int start, string value) { byte[] bytesTemp = Encoding.UTF8.GetBytes(value); ushort[] dest = Bytes2Ushorts(bytesTemp); dest.CopyTo(src, start); } /// <summary> /// 获取string /// </summary> /// <param name="src"></param> /// <param name="start"></param> /// <param name="len"></param> /// <returns></returns> public static string GetString(ushort[] src, int start, int len) { ushort[] temp = new ushort[len]; for (int i = 0; i < len; i++) { temp[i] = src[i + start]; } byte[] bytesTemp = Ushorts2Bytes(temp); string res = Encoding.UTF8.GetString(bytesTemp).Trim(new char[] { '\0' }); return res; } /// <summary> /// 赋值Real类型数据 /// </summary> /// <param name="src"></param> /// <param name="start"></param> /// <param name="value"></param> public static void SetReal(ushort[] src, int start, float value) { byte[] bytes = BitConverter.GetBytes(value); ushort[] dest = Bytes2Ushorts(bytes); dest.CopyTo(src, start); } /// <summary> /// 获取float类型数据 /// </summary> /// <param name="src"></param> /// <param name="start"></param> /// <returns></returns> public static float GetReal(ushort[] src, int start) { ushort[] temp = new ushort[2]; for (int i = 0; i < 2; i++) { temp[i] = src[i + start]; } byte[] bytesTemp = Ushorts2Bytes(temp); float res = BitConverter.ToSingle(bytesTemp, 0); return res; } /// <summary> /// 赋值Short类型数据 /// </summary> /// <param name="src"></param> /// <param name="start"></param> /// <param name="value"></param> public static void SetShort(ushort[] src, int start, short value) { byte[] bytes = BitConverter.GetBytes(value); ushort[] dest = Bytes2Ushorts(bytes); dest.CopyTo(src, start); } /// <summary> /// 获取short类型数据 /// </summary> /// <param name="src"></param> /// <param name="start"></param> /// <returns></returns> public static short GetShort(ushort[] src, int start) { ushort[] temp = new ushort[1]; temp[0] = src[start]; byte[] bytesTemp = Ushorts2Bytes(temp); short res = BitConverter.ToInt16(bytesTemp, 0); return res; } public static bool[] GetBools(ushort[] src, int start, int num) { ushort[] temp = new ushort[num]; for (int i = start; i < start + num; i++) { temp[i] = src[i + start]; } byte[] bytes = Ushorts2Bytes(temp); bool[] res = Bytes2Bools(bytes); return res; } private static bool[] Bytes2Bools(byte[] b) { bool[] array = new bool[8*b.Length]; for (int i = 0; i < b.Length; i++) { for (int j = 0; j < 8; j++) { array[i * 8 + j] = (b[i] & 1) == 1;//判定byte的最后一位是否为1，若为1，则是true；否则是false b[i] = (byte)(b[i] >> 1);//将byte右移一位 } } return array; } private static byte Bools2Byte(bool[] array) { if (array != null && array.Length > 0) { byte b = 0; for (int i = 0; i < 8; i++) { if (array[i]) { byte nn = (byte)(1 << i);//左移一位，相当于×2 b += nn; } } return b; } return 0; } private static ushort[] Bytes2Ushorts(byte[] src, bool reverse = false) { int len = src.Length; byte[] srcPlus = new byte[len + 1]; src.CopyTo(srcPlus, 0); int count = len >> 1; if (len % 2 != 0) { count += 1; } ushort[] dest = new ushort[count]; if(reverse) { for (int i = 0; i < count; i++) { dest[i] = (ushort)(srcPlus[i * 2] << 8 | srcPlus[2 * i + 1] & 0xff); } } else { for (int i = 0; i < count; i++) { dest[i] = (ushort)(srcPlus[i * 2] & 0xff | srcPlus[2 * i + 1] << 8 ); } } return dest; } private static byte[] Ushorts2Bytes(ushort[] src, bool reverse = false) { int count = src.Length; byte[] dest = new byte[count << 1]; if(reverse) { for (int i = 0; i < count; i++) { dest[i * 2] = (byte)(src[i] >> 8); dest[i * 2 + 1] = (byte)(src[i] >> 0); } } else { for (int i = 0; i < count; i++) { dest[i * 2] = (byte)(src[i] >> 0); dest[i * 2 + 1] = (byte)(src[i] >> 8); } } return dest; } }根据选择的类型写入
private void WriteExecute() { try { if(VariableType == "real") { ushort[] buff = new ushort[2]; float value = float.Parse(WriteValue); MODBUS.SetReal(buff, 0, value); modbus.WriteMultipleRegisters(SlaveID, WriteAddress, buff); } else if(VariableType == "string") { ushort[] buff = new ushort[10]; MODBUS.SetString(buff, 0, WriteValue); modbus.WriteMultipleRegisters(SlaveID, WriteAddress, buff); } else if(VariableType == "Int16") { ushort[] buff = new ushort[1]; short value = short.Parse(WriteValue); MODBUS.SetShort(buff, 0, value); modbus.WriteMultipleRegisters(SlaveID, WriteAddress, buff); } } catch (Exception ex) { Msg.Info(ex.Message); } }可以看到ModbusSlave上面的数据，一个浮点型数据占用两个寄存器，4个byte。按照下图设置后，可以看到，已经写入成功。
读取测试
private void ReadExecute() { try { if (VariableType == "real") { ushort[] buff = modbus.ReadHoldingRegisters(SlaveID, ReadAddress, 2); float value = MODBUS.GetReal(buff, 0); ReadValue = value.ToString(); } else if(VariableType == "string") { ushort[] buff = modbus.ReadHoldingRegisters(SlaveID, ReadAddress, 10); ReadValue = MODBUS.GetString(buff, 0, 10); } else if(VariableType == "Int16") { ushort[] buff = modbus.ReadHoldingRegisters(SlaveID, ReadAddress, 1); short value = MODBUS.GetShort(buff, 0); ReadValue = value.ToString(); } } catch (Exception ex) { Msg.Info(ex.Message); } }字符串写入和读取
参照VariableType=="string"部分代码。
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