C# ModbusTcp（协议）

以下用例为读取线圈，可读取多个连续的线圈（01功能码）
//起始地址 var inputAddress = 4; //读取长度 var inputReadLength = 8; var station =
BitConverter.GetBytes(4)[0]; //从站地址 var funCode =
BitConverter.GetBytes(1)[0];//功能码 var startAddress =
BitConverter.GetBytes(inputAddress)[1]; var endAddress =
BitConverter.GetBytes(inputAddress)[0]; var startLength =
BitConverter.GetBytes(inputReadLength)[1]; var endLength =
BitConverter.GetBytes(inputReadLength)[0]; TcpClient tcpClient = new
TcpClient(); tcpClient.Connect("", 502); byte[] by = new byte[] { //事物标识符 0x00,
0x00, //协议标识符 固定值 0x00, 0x00, //长度 0x00, 0x06, //从站地址 station, //功能码 funCode,
startAddress, //起始地址 endAddress, startLength, //读个数 endLength };
tcpClient.Client.Send(by); byte[] result = new byte[1024]; var ulength =
tcpClient.Client.Receive(result); var newResult =
result.ToList().Take(ulength).ToArray(); //输出报文 var output = string.Join(" ",
newResult.Select(x => x.ToString("X2"))); //00 00 00 00 00 04 04 01 01 00 //00
00 //事物标识符 服务器复制 //00 00 //协议标识符 固定值 //00 04 //长度 //04 //从站地址 //01 //功能码 //01
//个数 //00 //数值 byte[] bol = new byte[newResult[8]]; if (newResult[8] > 1) { for
(int i = 0; i < bol.Length; i++) bol[i] = newResult[8 + i + 1]; var getbyte =
ByteToBoolArray(bol, by[by.Length - 1]); getbyte.ToList().ForEach(x => {
Console.WriteLine(x); }); } else { bol[0] = newResult[9]; var getbyte =
ByteToBoolArray(bol, by[by.Length - 1]); getbyte.ToList().ForEach(x => {
Console.WriteLine(x); }); } } public static bool[] ByteToBoolArray(byte[]
InBytes, int length) { if (InBytes == null) return null; if (length >
InBytes.Length * 8) length = InBytes.Length * 8; bool[] buffer = new
bool[length]; for (int i = 0; i < length; i++) { int index = i / 8; int offect
= i % 8; byte temp = 0; switch (offect) { case 0: temp = 0x01; break; case 1:
temp = 0x02; break; case 2: temp = 0x04; break; case 3: temp = 0x08; break;
case 4: temp = 0x10; break; case 5: temp = 0x20; break; case 6: temp = 0x40;
break; case 7: temp = 0x80; break; default: break; } if ((InBytes[index] &
temp) == temp) { buffer[i] = true; } } return buffer; }
其他读写削微修改一下即可，如写入多个连续的float类型（float需要注意字节排序规则 ABCD...）
00 00 00 00 00 0F //报文长度 01 //从站地址 10 //功能码 00 00 //起始地址 00 04 //读取长度 08
//字节长度 42 05 33 33 42 05 33 33

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