1、安裝依賴(lài)包
System.IO.Ports
2、讀協(xié)議

/// <summary>
        /// Modbus-RTU協(xié)議讀實(shí)例
        /// </summary>
        private static void Read()
        {
            //組裝一個(gè)請(qǐng)求報(bào)文
            // 01 03 00 00 00 0A C5 CD
            byte slave = 0x01;
            //byte function = 0x03;   //讀單個(gè)寄存器
            byte function = 0x01;   //讀單個(gè)線(xiàn)圈狀態(tài)
            int startAddress = 0;
            int length = 10;

            List<byte> bytes = new List<byte>();
            bytes.Add(slave);
            bytes.Add(function);
            bytes.Add(BitConverter.GetBytes(startAddress)[1]);
            bytes.Add(BitConverter.GetBytes(startAddress)[0]);
            bytes.Add(BitConverter.GetBytes(length)[1]);
            bytes.Add(BitConverter.GetBytes(length)[0]);
            //CRC校驗(yàn)
            bytes = CRC16(bytes);
            //組裝好了進(jìn)行串口通信
            SerialPort serialPort = new SerialPort("COM1", 9600, Parity.None, 8, StopBits.One);
            serialPort.Open();
            //向從站發(fā)送請(qǐng)求
            serialPort.Write(bytes.ToArray(), 0, bytes.Count);
            Task.Run(async () =>
            {
                await Task.Delay(100);
                byte[] buffer = new byte[serialPort.BytesToRead];
                serialPort.DiscardInBuffer();

                List<byte> bufferList = new List<byte>(buffer);
                bufferList.RemoveAt(0);
                bufferList.RemoveAt(0);
                bufferList.RemoveAt(0);
                bufferList.RemoveAt(bufferList.Count - 1);
                bufferList.RemoveAt(bufferList.Count - 1);
                //讀寄存器
                //for(int i = 0; i < bufferList.Count; i++)
                //{
                //    List<byte> valueList = new List<byte>();
                //    valueList.Add(bufferList[i]);
                //    valueList.Add(bufferList[++i]);
                //    valueList.Reverse();
                //    ushort value=BitConverter.ToUInt16(valueList.ToArray(), 0);
                //    Console.WriteLine(value);
                //}
                //讀線(xiàn)圈 09 00
                bufferList.Reverse();
                var values = string.Join("", bufferList.Select(x => Convert.ToString(x, 2).PadLeft(8, '0')).ToList()).ToList();
                values.Reverse();
                for (int i = 0; i < values.Count; i++)
                {
                    Console.WriteLine(Convert.ToBoolean(int.Parse(values[i].ToString())));
                }
            });
        }

3、寫(xiě)協(xié)議

/// <summary>
        /// Modbus-RTU協(xié)議寫(xiě)實(shí)例
        /// </summary>
        private static void Write()
        {
            //組裝報(bào)文
            byte slave = 0x01;
            //byte function = 0x05;   //寫(xiě)單個(gè)線(xiàn)圈狀態(tài)
            byte function = 0x06;   //寫(xiě)單個(gè)寄存器
            int startAddress = 0;
            bool value = false;
            int iv = 123;

            List<byte> bytes = new List<byte>();
            bytes.Add(slave);
            bytes.Add(function);
            bytes.Add(BitConverter.GetBytes(startAddress)[1]);
            bytes.Add(BitConverter.GetBytes(startAddress)[0]);
            //單線(xiàn)圈的寫(xiě)入
            //bytes.Add(value ? (byte)0xFF : (byte)0x00);
            //bytes.Add(0x00);
            //單寄存器寫(xiě)入
            bytes.Add(BitConverter.GetBytes(iv)[1]);
            bytes.Add(BitConverter.GetBytes(iv)[0]);
            //CRC校驗(yàn)
            bytes = CRC16(bytes);
            SerialPort serialPort = new SerialPort("COM1", 9600, Parity.None, 8, StopBits.One);
            serialPort.Open();
            //向從站發(fā)送請(qǐng)求
            serialPort.Write(bytes.ToArray(), 0, bytes.Count);
            //接收后如果報(bào)文一致，說(shuō)明發(fā)送請(qǐng)求成功
        }

4、CRC16校驗(yàn)文章來(lái)源地址http://www.zghlxwxcb.cn/news/detail-615777.html

/// <summary>
        /// CRC-16校驗(yàn)
        /// </summary>
        /// <param name="value"></param>
        /// <param name="poly"></param>
        /// <param name="crcInit"></param>
        /// <returns></returns>
        /// <exception cref="ArgumentException"></exception>
        private static List<byte> CRC16(List<byte> value,ushort poly=0xA001,ushort crcInit=0xFFFF)
        {
            if (value == null || !value.Any())
                throw new ArgumentException("");
            //運(yùn)算
            ushort crc = crcInit;
            for(int i=0; i<value.Count; i++)
            {
                crc = (ushort)(crc ^ value[i]);
                for(int j=0; j<8; j++)
                {
                    crc=(crc&1)!=0?(ushort)((crc>>1)^poly):(ushort)(crc>>1);
                }
            }
            byte hi = (byte)((crc & 0xFF00) >> 8);
            byte lo=(byte)(crc & 0xFF);
            List<byte> buffer = new List<byte>();
            buffer.AddRange(value);
            buffer.Add(lo);
            buffer.Add(hi);
            return buffer;
        }

到了這里，關(guān)于Modbus-RTU協(xié)議C#實(shí)現(xiàn)的文章就介紹完了。如果您還想了解更多內(nèi)容，請(qǐng)?jiān)谟疑辖撬阉鱐OY模板網(wǎng)以前的文章或繼續(xù)瀏覽下面的相關(guān)文章，希望大家以后多多支持TOY模板網(wǎng)！