❶ 51单片机C语言怎么写Modbus通信程序
刚好我在弄crc校验。给你一段代码。我也是冲网上抄过来的。验证过了。
unsigned short crc16;
static uchar code auchCRCHi[256] = {
0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0,
0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0,
0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1,
0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,
0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1,
0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0,
0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40,
0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1,
0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0,
0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40,
0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0,
0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0,
0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0,
0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0,
0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40,
0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1,
0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0,
0x80, 0x41, 0x00, 0xC1, 0x81, 0x40
};
// CRC 低位字节值表
static uchar code auchCRCLo[256] = {
0x00, 0xC0, 0xC1, 0x01, 0xC3, 0x03, 0x02, 0xC2, 0xC6, 0x06,
0x07, 0xC7, 0x05, 0xC5, 0xC4, 0x04, 0xCC, 0x0C, 0x0D, 0xCD,
0x0F, 0xCF, 0xCE, 0x0E, 0x0A, 0xCA, 0xCB, 0x0B, 0xC9, 0x09,
0x08, 0xC8, 0xD8, 0x18, 0x19, 0xD9, 0x1B, 0xDB, 0xDA, 0x1A,
0x1E, 0xDE, 0xDF, 0x1F, 0xDD, 0x1D, 0x1C, 0xDC, 0x14, 0xD4,
0xD5, 0x15, 0xD7, 0x17, 0x16, 0xD6, 0xD2, 0x12, 0x13, 0xD3,
0x11, 0xD1, 0xD0, 0x10, 0xF0, 0x30, 0x31, 0xF1, 0x33, 0xF3,
0xF2, 0x32, 0x36, 0xF6, 0xF7, 0x37, 0xF5, 0x35, 0x34, 0xF4,
0x3C, 0xFC, 0xFD, 0x3D, 0xFF, 0x3F, 0x3E, 0xFE, 0xFA, 0x3A,
0x3B, 0xFB, 0x39, 0xF9, 0xF8, 0x38, 0x28, 0xE8, 0xE9, 0x29,
0xEB, 0x2B, 0x2A, 0xEA, 0xEE, 0x2E, 0x2F, 0xEF, 0x2D, 0xED,
0xEC, 0x2C, 0xE4, 0x24, 0x25, 0xE5, 0x27, 0xE7, 0xE6, 0x26,
0x22, 0xE2, 0xE3, 0x23, 0xE1, 0x21, 0x20, 0xE0, 0xA0, 0x60,
0x61, 0xA1, 0x63, 0xA3, 0xA2, 0x62, 0x66, 0xA6, 0xA7, 0x67,
0xA5, 0x65, 0x64, 0xA4, 0x6C, 0xAC, 0xAD, 0x6D, 0xAF, 0x6F,
0x6E, 0xAE, 0xAA, 0x6A, 0x6B, 0xAB, 0x69, 0xA9, 0xA8, 0x68,
0x78, 0xB8, 0xB9, 0x79, 0xBB, 0x7B, 0x7A, 0xBA, 0xBE, 0x7E,
0x7F, 0xBF, 0x7D, 0xBD, 0xBC, 0x7C, 0xB4, 0x74, 0x75, 0xB5,
0x77, 0xB7, 0xB6, 0x76, 0x72, 0xB2, 0xB3, 0x73, 0xB1, 0x71,
0x70, 0xB0, 0x50, 0x90, 0x91, 0x51, 0x93, 0x53, 0x52, 0x92,
0x96, 0x56, 0x57, 0x97, 0x55, 0x95, 0x94, 0x54, 0x9C, 0x5C,
0x5D, 0x9D, 0x5F, 0x9F, 0x9E, 0x5E, 0x5A, 0x9A, 0x9B, 0x5B,
0x99, 0x59, 0x58, 0x98, 0x88, 0x48, 0x49, 0x89, 0x4B, 0x8B,
0x8A, 0x4A, 0x4E, 0x8E, 0x8F, 0x4F, 0x8D, 0x4D, 0x4C, 0x8C,
0x44, 0x84, 0x85, 0x45, 0x87, 0x47, 0x46, 0x86, 0x82, 0x42,
0x43, 0x83, 0x41, 0x81, 0x80, 0x40
};
//CRC校验的函数
unsigned short CRC16(unsigned char *puchMsg, unsigned short usDataLen)
{
unsigned char uchCRCHi = 0xFF ; /* 高CRC字节初始化 */
unsigned char uchCRCLo = 0xFF ; /* 低CRC 字节初始化 */
unsigned uIndex ; /* CRC循环中的索引 */
while (usDataLen--) /* 传输消息缓冲区 */
{
uIndex = uchCRCHi ^ *puchMsg++ ; /* 计算CRC */
uchCRCHi = uchCRCLo ^ auchCRCHi[uIndex] ;
uchCRCLo = auchCRCLo[uIndex] ;
}
return (uchCRCHi << 8 | uchCRCLo) ;
}
调用方式：dd=CRC16(tmp,x)；
❷ modbus娴鐐规暟鍑芥暟姹傝В
杩欎釜鍏堣繘琛岄『搴忔暣鐞嗭紝鏄鍗佸叚杩涘埗鐨47F12000杞鎴娴鐐规暟鏄123456.0
鍗佸叚杩涘埗鐨47F12000鐨浜岃繘鍒鏄0100 0111 1111 0001 0010 0000 0000 0000
鏈楂樹綅鏄绗﹀彿浣嶏紝0涓烘ｆ暟
8浣嶉樁鐮侊紝100 0111 1 = 143 = 127 + 16
涔熷氨鏄灏忔暟鐐圭Щ鍔16浣嶏紝鍥犳ゅ皬鏁扮偣鐨勪綅缃搴旇ユ槸
111 0001 0010 0000 0.000 0000
鍓嶉潰鍐嶅姞涓涓1锛堣繖涓鏄鍥哄畾鐨勭渷鐣ヤ竴涓1锛
灏辨槸1111 0001 0010 0000 0.000 0000
鏁存暟閮ㄥ垎灏辨槸1111 0001 0010 0000 0 = 123456
灏忔暟閮ㄥ垎灏辨槸000 0000 = 0
鍥犳ゆ渶缁堝氨鏄123456.0
璇︽儏璇风湅IEEE浜岃繘鍒舵诞鐐规暟绠楁湳鏍囧噯锛IEEE 754锛夈傞兘鏄鎸夌収杩欎釜鏍囧噯杩涜岀殑杞鎹㈣＄畻銆傝繖涓浣滀负浜嗚В鍗冲彲锛屾病鍙戠幇鏈缂栫▼璇瑷闇瑕佹牴鎹杩欑嶇瑪绠楃畻娉曞幓缂栬緫杞鎹㈢畻娉曠殑銆傞兘鏄鏈夌浉搴旂殑鎸囦护鎴栬呭嚱鏁般
鏈涢噰绾炽傘傘傘傘傘
❸ 只知道客户机IP地址,怎么实现modbus功能，编码遇到瓶颈了，用的是libmodbus库，在linux系统下qt开发
C#的行吗?可以的话我再给你大概的代码
拿读数据做例子,其他的功能重要改掉03功能码就行
先组成命令的byte数组
byte[] Dp = new byte[8];
byte[] DpC = new byte[6];
Dp[0] = 0x01;//这是表的地址,假定是01
Dp[1] = 0x03;//这是功能码,03是读寄存器数据
Dp[2] = 0x00;
Dp[3] = 0x03;//表的相应寄存器地址
Dp[4] = 0x00;
Dp[5] = 0x0C;//表的相应寄存器参数,根据功能码和表的不同,这几个编码有变化
for (int i = 0; i < 6; i++)
{
DpC[i] = Dp[i];
}
uint ValCRC;
ValCRC = CRC(DpC);//CRC为自己写的CRC-16校验码的函数,具体的实现这里不给要的话可以发给你
Dp[6] = (byte)(ValCRC % 256);
Dp[7] = (byte)(ValCRC / 256);
然后把这个数组发给串口,编程语言不同发送方式不同
还在程序可以设置波特率,校验什么的,编程语言不同设置方式也不同
然后接受数据,也是一个byte数组
然后自己解析数组,把需要的转化成10进制或者你需要的格式
大概就这样
❹ ModbusTCP 绋嬪簭濡備綍瀹炵幇姝ヨ繘鐢垫満鐨勮繍鍔ㄦ柟鍚戯紵
ModbusTCP鍗忚鏄涓绉嶇敤浜庤繛鎺ュ伐涓氱數瀛愯惧囧拰鍏朵粬鍏锋湁Modbus鎺ュ彛鐨勮惧囩殑閫氫俊鍗忚銆傚畠琚骞挎硾鐢ㄤ簬宸ヤ笟鑷鍔ㄥ寲搴旂敤涓锛屽寘鎷姝ヨ繘鐢垫満鐨勬帶鍒躲
姝ヨ繘鐢垫満鏄涓绉嶉氳繃鎺у埗鑴夊啿鏁伴噺鍜岄戠巼鏉ユ帶鍒剁數鏈烘棆杞瑙掑害鍜岄熷害鐨勭數鏈恒傚湪ModbusTCP绋嬪簭涓锛屽彲浠ラ氳繃浠ヤ笅姝ラゆ潵瀹炵幇姝ヨ繘鐢垫満鐨勮繍鍔ㄦ柟鍚戯細
1. 棣栧厛锛岄渶瑕佷娇鐢∕odbusTCP搴撴垨API鏉ョ紪鍐橫odbusTCP瀹㈡埛绔绋嬪簭銆傝繖涓绋嬪簭灏嗕笌ModbusTCP鏈嶅姟鍣锛堥氬父鏄疨LC鎴栧伐涓歅C锛夎繘琛岄氫俊銆
2. 鍦∕odbusTCP瀹㈡埛绔绋嬪簭涓锛岄渶瑕佽剧疆ModbusTCP杩炴帴鍙傛暟锛屽寘鎷鏈嶅姟鍣↖P鍦板潃銆佺鍙ｅ彿鍜岄氫俊鍗忚绛夈
3. 鍦∕odbusTCP杩炴帴寤虹珛鍚庯紝闇瑕佷娇鐢∕odbus鍑芥暟搴撲腑鐨凪odbusReadCoil鍑芥暟鎴朚odbusReadInputCoil鍑芥暟鏉ヨ诲彇ModbusTCP鏈嶅姟鍣ㄤ腑鐨勭嚎鍦堝瘎瀛樺櫒鐘舵併傝繖浜涘瘎瀛樺櫒閫氬父鐢ㄤ簬鎺у埗姝ヨ繘鐢垫満鐨勮繍鍔ㄦ柟鍚戙
4. 濡傛灉闇瑕佹敼鍙樻ヨ繘鐢垫満鐨勮繍鍔ㄦ柟鍚戯紝鍙浠ヤ娇鐢∕odbusWriteCoil鍑芥暟鎴朚odbusWriteOutputCoil鍑芥暟鏉ュ啓鍏ョ嚎鍦堝瘎瀛樺櫒锛屼粠鑰屾敼鍙樻ヨ繘鐢垫満鐨勮繍鍔ㄦ柟鍚戙
5. 鍦∕odbusTCP瀹㈡埛绔绋嬪簭涓锛岃繕鍙浠ヤ娇鐢∕odbusReadHoldingRegister鍑芥暟鎴朚odbusReadInputRegister鍑芥暟鏉ヨ诲彇淇濇寔瀵勫瓨鍣ㄦ垨杈撳叆瀵勫瓨鍣ㄤ腑鐨勫硷紝浠ヨ幏鍙栨ヨ繘鐢垫満鐨勫綋鍓嶄綅缃鎴栧叾浠栫姸鎬佷俊鎭銆
6. 鏈鍚庯紝闇瑕佸叧闂璏odbusTCP杩炴帴骞堕噴鏀捐祫婧愩
闇瑕佹敞鎰忕殑鏄锛孧odbusTCP绋嬪簭鐨勫叿浣撳疄鐜版柟寮忓彇鍐充簬浣跨敤鐨勭紪绋嬭瑷鍜屽紑鍙戠幆澧冦備互涓婃ラゆ彁渚涗簡涓涓鍩烘湰鐨勬嗘灦锛屼絾鍏蜂綋鐨勫疄鐜扮粏鑺傚彲鑳戒細鏈夋墍涓嶅悓銆