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modbusClient.cpp
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#include "modbusClient.h"
unsigned char modbusBeginTimeout = 10;
unsigned char modbusEndTimeout = 5;
unsigned char modbusSendBuff[256] = { 0 };
unsigned char modbusRecvBuff[256] = { 0 };
char re[1024];
const unsigned char 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
};
/* Table of CRC values for low order byte */
const unsigned char 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
};
//读线圈功能（功能码01）
unsigned short* read0xxxx_01(unsigned char station, unsigned short mbAddr, unsigned short quantityOfReg)
{
mbAddr -= 1;
char* temp;
modbusSendBuff[0] = station; //ID
modbusSendBuff[1] = 0x01; //功能码01
modbusSendBuff[2] = *((unsigned char*)&mbAddr + 1); //起始寄存器地址高位
modbusSendBuff[3] = *(unsigned char*)&mbAddr; //起始寄存器地址低位
modbusSendBuff[4] = *((unsigned char*)&quantityOfReg + 1); //寄存器数目高位
modbusSendBuff[5] = *(unsigned char*)&quantityOfReg; //寄存器数目低位
int num = 0;
if (modbusSend(modbusSendBuff, 6, 1) == 0) {
return 0;
}
*((unsigned char*)&num + 1) = 0x00;
*((unsigned char*)&num) = re[3];
unsigned short re_2[7];
for (int i = 0; i < quantityOfReg; i++) {
re_2[i] = num % 2;
num = num / 2;
}
return re_2;
}
unsigned short* read1xxxx_02(unsigned char station, unsigned short mbAddr, unsigned short quantityOfReg)
{
mbAddr -= 1;
char* temp;
modbusSendBuff[0] = station; //ID
modbusSendBuff[1] = 0x02; //功能码01
modbusSendBuff[2] = *((unsigned char*)&mbAddr + 1); //起始寄存器地址高位
modbusSendBuff[3] = *(unsigned char*)&mbAddr; //起始寄存器地址低位
modbusSendBuff[4] = *((unsigned char*)&quantityOfReg + 1); //寄存器数目高位
modbusSendBuff[5] = *(unsigned char*)&quantityOfReg; //寄存器数目低位
int num = 0;
if (modbusSend(modbusSendBuff, 6, 1) == 0) {
return 0;
}
*((unsigned char*)&num + 1) = 0x00;
*((unsigned char*)&num) = re[3];
unsigned short re_2[7];
for (int i = 0; i < quantityOfReg; i++) {
re_2[i] = num % 2;
num = num / 2;
}
return re_2;
}
unsigned short* read4xxxx_03(unsigned char station, unsigned short mbAddr, unsigned short quantityOfReg)
{
mbAddr -= 1;
modbusSendBuff[0] = station; //ID
modbusSendBuff[1] = 0x03; //功能码03
modbusSendBuff[2] = *((unsigned char*)&mbAddr + 1); //起始寄存器地址高位
modbusSendBuff[3] = *(unsigned char*)&mbAddr; //起始寄存器地址低位
modbusSendBuff[4] = *((unsigned char*)&quantityOfReg + 1); //寄存器数目高位
modbusSendBuff[5] = *(unsigned char*)&quantityOfReg; //寄存器数目低位
unsigned short re_2[7];
if (modbusSend(modbusSendBuff, 6, 1) == 0) {
return 0;
}
for (int i = 0; i < quantityOfReg; i++) {
*((unsigned char*)&re_2[i] + 1) = re[3 + 2 * i];
*((unsigned char*)&re_2[i]) = re[4 + 2 * i];
}
return re_2;
}
unsigned short* read3xxxx_04(unsigned char station, unsigned short mbAddr, unsigned short quantityOfReg)
{
mbAddr -= 1;
modbusSendBuff[0] = station; //ID
modbusSendBuff[1] = 0x04; //功能码03
modbusSendBuff[2] = *((unsigned char*)&mbAddr + 1); //起始寄存器地址高位
modbusSendBuff[3] = *(unsigned char*)&mbAddr; //起始寄存器地址低位
modbusSendBuff[4] = *((unsigned char*)&quantityOfReg + 1); //寄存器数目高位
modbusSendBuff[5] = *(unsigned char*)&quantityOfReg; //寄存器数目低位
unsigned short re_2[7];
if (modbusSend(modbusSendBuff, 6, 1) == 0) {
return 0;
}
for (int i = 0; i < quantityOfReg; i++) {
*((unsigned char*)&re_2[i] + 1) = re[3 + 2 * i];
*((unsigned char*)&re_2[i]) = re[4 + 2 * i];
}
return re_2;
}
int writeSingle0xxxx_05(unsigned char station, unsigned short mbAddr, unsigned short data)
{
mbAddr -= 1;
modbusSendBuff[0] = station;
modbusSendBuff[1] = 0x05;
modbusSendBuff[2] = *((unsigned char*)&mbAddr + 1);
modbusSendBuff[3] = *(unsigned char*)&mbAddr;
modbusSendBuff[4] = *((unsigned char*)&data + 1);
modbusSendBuff[5] = *(unsigned char*)&data;
if (modbusSend(modbusSendBuff, 6, 2) == 2) {
return 2;
}
return 0;
}
int writeSingle4xxxx_06(unsigned char station, unsigned short mbAddr, unsigned short data)
{
mbAddr -= 1;
modbusSendBuff[0] = station;
modbusSendBuff[1] = 0x06;
modbusSendBuff[2] = *((unsigned char*)&mbAddr + 1);
modbusSendBuff[3] = *(unsigned char*)&mbAddr;
modbusSendBuff[4] = *((unsigned char*)&data + 1);
modbusSendBuff[5] = *(unsigned char*)&data;
if (modbusSend(modbusSendBuff, 6, 2) == 2) {
return 2;
}
return 0;
}
//数据发送
int modbusSend(unsigned char* frame, unsigned char len, int r_w)
{
unsigned short crc;
DWORD dwBytesWrite;
//发送缓存溢出
if ((255 - 2) < len)
{
return 0;
}
//计算crc
crc = calcCRC(frame, len);
//填写crc
frame[len++] = *((unsigned char*)&crc);
frame[len++] = *((unsigned char*)&crc + 1);
//发送Frame前，线路空闲3.5个字符周期
Sleep(modbusBeginTimeout);
char* temp;
temp = mod_send((char*)frame, len + 2, r_w);
if (temp == 0) {
return 0;
}
else if (strcmp(temp, (char*)frame) == 0) {
return 2;
}
//printf("modbusSend\n");
for (int i = 0; i < 8; i++) {
re[i] = temp[i];
}
return 1;
}
//crc校验码计算
unsigned short calcCRC(unsigned char* puchMsg, unsigned char usDataLen)
{
unsigned char uchCRCHi = 0xFF; /* high byte of CRC initialized */
unsigned char uchCRCLo = 0xFF; /* low byte of CRC initialized */
unsigned char uIndex; /* will index into CRC lookup table */
while (usDataLen--) /* pass through message buffer */
{
uIndex = uchCRCLo ^ *puchMsg++; /* calculate the CRC */
uchCRCLo = uchCRCHi ^ auchCRCHi[uIndex];
uchCRCHi = auchCRCLo[uIndex];
}
return (uchCRCHi << 8 | uchCRCLo);
}
//modbus配置
void initMODBUS(void)
{
modbusBeginTimeout = (unsigned char)((3.5 * 10 * 1000) / MODBUSRAUDRATE + 1);
modbusEndTimeout = (unsigned char)((1.5 * 10 * 1000) / MODBUSRAUDRATE + 20);
#ifdef _MODBUSDEBUG_
printf("modbusBeginTimeout = %dms\n", modbusBeginTimeout);
printf("modbusEndTimeout = %dms\n", modbusEndTimeout);
#endif
return;
}