Updata:  MCGS与51单片机modbus通讯程序学习(二)之MCGS成功控制51单片机

     目前，工业组态软件已经广泛应用于工业控制领域。用户无需了解复杂的编程知识，就可以用工业组态软件在短时间内完成一个具备专业水准的计算机监控系统的开发工作。MCGS是一套基于Windows平台的、为工业过程控制和实时监测服务的32位全中文界面组态软件系统。为了与现场设备进行交互，它提供了国内外各种常用的工控设备的工控设备的驱动程序；但现场很多设备是厂家根据本厂要求定制的设备，这就需要设计定制新设备与MCGS的数据通讯程序。

     学习MCGS与51单片机modbus通讯是因为本身对MCGS和51都挺熟悉的，业余可以利用这两样实现一些应用，前段时间在工控网看到攻城狮阿水利用家里闲置的一台PLC和一台触摸屏制作了套自动窗帘系统，利用触摸屏控制窗帘的打开和关闭；

“前段时间在家想想了，将学习用的屏和在工控网淘的二手三菱PLC做了家庭自动化管理，先给孩子房间做好了大号闹钟和手控制或自控窗帘，直接上图，先给最难的动力部份上图：”

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另外一位攻城狮广州@阿君—王者之师利用闲置在家的PLC做一个定时系统去控制电饭锅到设置时间自动煮饭。

定时时间为中午11：30开始煮饭···大概12：00下班刚好煮熟···

定时时间为下午16：30开始煮饭···大概117：00下班刚好煮熟···

既不用浪费保温耗电 也节省了下班还要煮饭的时间！！！

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如果前面两个攻城狮DIY的控制核心由PLC换成单片机或许有很大推广价值，毕竟低端的PLC也要过千元。我感兴趣的也是在智能家居方面的DIY， MCGS作上位机，多个不同功能的单片机模块放置在家庭的适当位置进行检测、执行并向上位机MCGS传输检测数据和执行结果等数据。

     Modbus协议是应用于电子控制器上的一种通用语言。通过此协议，控制器相互之间、控制器经由网络（例如以太网）和其他设备之间可以通信。它已经成为一通用工业标准。有了它，不同厂商生产的控制设备可以连成工业网络，进行集中监控。

     下面是从网上找的一个51 modbus 例程 ，还没有通讯成功，在测试之中。

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[code lang=”c”]

//***********************Main.c Start*************************//

#include "main.h"

/******************************
微控电子 www.mcuc.cn
modbus RTU 的C51程序
单片机89S52
通信波特率 9600 8位数据 1位停止位 偶校验 485通位接口
单片机控制板地址 localAddr(变量)
通信可设置数据的地址：
字地址 0 – 255 (只取16位的低8位)
位地址 0 – 255 (只取16位的低8位)
*******************************/

uint32 dwTickCount,dwIntTick; //时钟
uint8 idata sendBuf[16],receBuf[16]; //发送接收缓冲区
uint8 idata checkoutError; // ==2 偶校验错
uint8 idata receTimeOut; //接收超时
uint8 idata c10ms; //10ms 计时
bit b1ms,bt1ms,b10ms,bt10ms,b100ms,bt100ms; //定时标志位

// 串行中断程序
void commIntProc() interrupt 4
{
if(TI)
{
TI = 0;
if(sendPosi < sendCount)
{
sendPosi++;
ACC = sendBuf[sendPosi];
TB8 = P; //加上校验位
SBUF = sendBuf[sendPosi];
}
else
{
b485Send = 0; //发送完后将485置于接收状态
receCount = 0; //清接收地址偏移寄存器
checkoutError = 0;
}
}
else if(RI)
{
RI = 0;
receTimeOut = 10; //通讯超时值
receBuf[receCount] = SBUF;
ACC = receBuf[receCount];
if(P != RB8)
checkoutError = 2; //偶校验出错
receCount++; //接收地址偏移寄存器加1
receCount &= 0x0f; //最多一次只能接收16个字节
}

} // void CommIntProc()

//定时器0 1ms 中断
void timer0IntProc() interrupt 1
{
TL0 = TIMER_LOW;
TH0 = TIMER_HIGHT;
dwIntTick++;
bt1ms = 1;
c10ms++;
if(c10ms >= 10)
{
c10ms = 0; //10ms计时器清零
bt10ms = 1;
}
} // void Timer0IntProc()

//外部中断0
void intEx0Proc(void) interrupt 0
{

}

//计数器1中断
void counter1IntProc(void) interrupt 3 using 1
{

}

//定时处理
void timeProc(void)
{
static uint8 c200ms;

bWatchDog = ~ bWatchDog; //看门狗取反
b1ms = 0;
b10ms = 0;
b100ms = 0;

ET0 = 0;
dwTickCount = dwIntTick;
ET0 = 1;

if(bt1ms)
{
bt1ms = 0;
b1ms = 1;

if(receTimeOut>0)
{
receTimeOut–;
if(receTimeOut==0 && receCount>0) //判断通讯接收是否超时
{
b485Send = 0; //将485置为接收状态
receCount = 0; //将接收地址偏移寄存器清零
checkoutError = 0;
}
}
}

if(bt100ms)
{
bt100ms = 0;
b100ms = 1;
}
if(bt10ms) //判断中断10ms标志位是否1
{
bt10ms = 0; //清中断10ms标志位
b10ms = 1;

c200ms++; //200ms计时器加1
if(c200ms >= 20) //判断是否计时到200ms
{
c200ms = 0; //清200ms计时器
bRunLED = ~bRunLED; //取反运行指示灯
}
}
} // void TimerProc(void)

//初始化串口
void initUart(void)
{
//T2 用于波特率 9600
T2CON = 0x30;
RCAP2H = 0xff;
RCAP2L = 0xb8;
TR2 = 1;

//偶校验
SCON = 0xd0;
PCON = 0;
ES = 1;
}//void initUart(void)

//初始化中断
void initInt(void)
{
TMOD = 0x51;
TH0 = TIMER_HIGHT;
TL0 = TIMER_LOW;
TR0 = 1;
ET0 = 1;
TH1 = 0; //9600
TL1 = 0;
TR1 = 0; //定时器1用于计数定时器2用于波特
ET1 = 1;
//PT1 = 1;

IT0 = 1;
IT1 = 1;
EX0 = 0;
PX0 = 1;
EX1 = 0;

initUart();

EA = 1;
} // void initInt(void)

//初始化
void initProg(void)
{
initInt();
b485Send = 0;
}

void main(void)
{
initProg();

while(1)
{
timeProc();
checkComm0Modbus();
}
}
//***********************main.c End*************************//
//***********************Main.h Start*************************//
#include "reg52.h"

typedef unsigned char uint8;
typedef unsigned int uint16;
typedef unsigned long uint32;

sbit bRunLED = P3^4; //运行指示灯
sbit bWatchDog = P1^7; //看门狗复位
sbit b485Send = P1^3; //75LBC184 发送接收控制

#define TIMER_HIGHT 0xf8
#define TIMER_LOW 0xcd

extern uint8 idata sendBuf[16],receBuf[16];
extern uint8 idata checkoutError; // ==2 偶校验错
extern uint8 idata receTimeOut;
extern uint32 dwTickCount;

#include "modbus.h"

/****************** Main.h End*******************/
/****************** Modbus.c Start*******************/
#include "main.h"

//字地址 0 – 255 (只取低8位)
//位地址 0 – 255 (只取低8位)

/* CRC 高位字节值表 */
const uint8 code auchCRCHi[] = {
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*/
const uint8 code auchCRCLo[] = {
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
} ;

uint8 testCoil; //用于测试 位地址1
uint16 testRegister; //用于测试 字址址16

uint8 localAddr = 1; //单片机控制板的地址
uint8 sendCount; //发送字节个数
uint8 receCount; //接收到的字节个数
uint8 sendPosi; //发送位置

uint16 crc16(uint8 *puchMsg, uint16 usDataLen)
{
uint8 uchCRCHi = 0xFF ; /* 高CRC字节初始化 */
uint8 uchCRCLo = 0xFF ; /* 低CRC 字节初始化 */
uint32 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) ;
}//uint16 crc16(uint8 *puchMsg, uint16 usDataLen)

//开始发送
void beginSend(void)
{
b485Send = 1; //设为发送

sendPosi = 0;
if(sendCount > 1)
sendCount–;
ACC = sendBuf[0];
TB8 = P;
SBUF = sendBuf[0];

}//void beginSend(void)

//读线圈状态
void readCoil(void)
{
uint8 addr;
uint8 tempAddr;
uint8 byteCount;
uint8 bitCount;
uint16 crcData;
uint8 position;
uint8 i,k;
uint8 result;
uint16 tempData;
uint8 exit = 0;

//addr = (receBuf[2]<<8) + receBuf[3];
//tempAddr = addr & 0xfff;
addr = receBuf[3];
tempAddr = addr;

//bitCount = (receBuf[4]<<8) + receBuf[5]; //读取的位个数
bitCount = receBuf[5];

byteCount = bitCount / 8; //字节个数
if(bitCount%8 != 0)
byteCount++;

for(k=0;k<byteCount;k++)
{//字节位置
position = k + 3;
sendBuf[position] = 0;
for(i=0;i<8;i++)
{
getCoilVal(tempAddr,&tempData);

sendBuf[position] |= tempData << i;
tempAddr++;
if(tempAddr >= addr+bitCount)
{ //读完
exit = 1;
break;
}
}
if(exit == 1)
break;
}

sendBuf[0] = localAddr;
sendBuf[1] = 0x01;
sendBuf[2] = byteCount;
byteCount += 3;
crcData = crc16(sendBuf,byteCount);
sendBuf[byteCount] = crcData >> 8;
byteCount++;
sendBuf[byteCount] = crcData & 0xff;
sendCount = byteCount + 1;

beginSend();
}//void readCoil(void)

//读寄存器
void readRegisters(void)
{
uint8 addr;
uint8 tempAddr;
uint16 result;
uint16 crcData;
uint8 readCount;
uint8 byteCount;
uint8 finsh; //1完成 0出错
uint16 i;
uint16 tempData = 0;

//addr = (receBuf[2]<<8) + receBuf[3];
//tempAddr = addr & 0xfff;
addr = receBuf[3];
tempAddr = addr;

//readCount = (receBuf[4]<<8) + receBuf[5]; //要读的个数
readCount = receBuf[5];

byteCount = readCount * 2;

for(i=0;i<byteCount;i+=2,tempAddr++)
{
getRegisterVal(tempAddr,&tempData);
sendBuf[i+3] = tempData >> 8;
sendBuf[i+4] = tempData & 0xff;
}

sendBuf[0] = localAddr;
sendBuf[1] = 3;
sendBuf[2] = byteCount;
byteCount += 3;
crcData = crc16(sendBuf,byteCount);
sendBuf[byteCount] = crcData >> 8;
byteCount++;
sendBuf[byteCount] = crcData & 0xff;

sendCount = byteCount + 1;
beginSend();
}//void readRegisters(void)

//强制单个线圈
void forceSingleCoil(void)
{
uint8 addr;
uint8 tempAddr;
uint16 tempData;
uint8 onOff;
uint8 i;

//addr = (receBuf[2]<<8) + receBuf[3];
//tempAddr = addr & 0xfff;
addr = receBuf[3];
tempAddr = addr;

//onOff = (receBuf[4]<<8) + receBuf[5];
onOff = receBuf[4];

//if(onOff == 0xff00)
if(onOff == 0xff)
{ //设为ON
tempData = 1;
}
//else if(onOff == 0x0000)
else if(onOff == 0x00)
{ //设为OFF
tempData = 0;
}

setCoilVal(tempAddr,tempData);

for(i=0;i<receCount;i++)
{
sendBuf[i] = receBuf[i];
}
sendCount = receCount;
beginSend();
}//void forceSingleCoil(void)

//设置多个寄存器
void presetMultipleRegisters(void)
{
uint8 addr;
uint8 tempAddr;
uint8 byteCount;
uint8 setCount;
uint16 crcData;
uint16 tempData;
uint8 finsh; //为1时完成 为0时出错
uint8 i;

//addr = (receBuf[2]<<8) + receBuf[3];
//tempAddr = addr & 0xfff;
addr = receBuf[3];
tempAddr = addr & 0xff;

//setCount = (receBuf[4]<<8) + receBuf[5];
setCount = receBuf[5];
byteCount = receBuf[6];

for(i=0;i<setCount;i++,tempAddr++)
{
tempData = (receBuf[i*2+7]<<8) + receBuf[i*2+8];

setRegisterVal(tempAddr,tempData);
}

sendBuf[0] = localAddr;
sendBuf[1] = 16;
sendBuf[2] = addr >> 8;
sendBuf[3] = addr & 0xff;
sendBuf[4] = setCount >> 8;
sendBuf[5] = setCount & 0xff;
crcData = crc16(sendBuf,6);
sendBuf[6] = crcData >> 8;
sendBuf[7] = crcData & 0xff;
sendCount = 8;
beginSend();
}//void presetMultipleRegisters(void)

//检查uart0数据
void checkComm0Modbus(void)
{
uint16 crcData;
uint16 tempData;

if(receCount > 4)
{
switch(receBuf[1])
{
case 1://读取线圈状态(读取点 16位以内)
case 3://读取保持寄存器(一个或多个)
case 5://强制单个线圈
case 6://设置单个寄存器
if(receCount >= 8)
{//接收完成一组数据
//应该关闭接收中断

if(receBuf[0]==localAddr && checkoutError==0)
{
crcData = crc16(receBuf,6);
if(crcData == receBuf[7]+(receBuf[6]<<8))
{//校验正确
if(receBuf[1] == 1)
{//读取线圈状态(读取点 16位以内)
readCoil();
}
else if(receBuf[1] == 3)
{//读取保持寄存器(一个或多个)
readRegisters();
}
else if(receBuf[1] == 5)
{//强制单个线圈
forceSingleCoil();
}
else if(receBuf[1] == 6)
{
//presetSingleRegister();
}

}
}
receCount = 0;
checkoutError = 0;
}
break;

case 15://设置多个线圈
tempData = receBuf[6];
tempData += 9; //数据个数
if(receCount >= tempData)
{
if(receBuf[0]==localAddr && checkoutError==0)
{
crcData = crc16(receBuf,tempData-2);
if(crcData == (receBuf[tempData-2]<<8)+ receBuf[tempData-1])
{
//forceMultipleCoils();
}
}
receCount = 0;
checkoutError = 0;
}
break;

case 16://设置多个寄存器
tempData = (receBuf[4]<<8) + receBuf[5];
tempData = tempData * 2; //数据个数
tempData += 9;
if(receCount >= tempData)
{
if(receBuf[0]==localAddr && checkoutError==0)
{
crcData = crc16(receBuf,tempData-2);
if(crcData == (receBuf[tempData-2]<<8)+ receBuf[tempData-1])
{
presetMultipleRegisters();
}
}
receCount = 0;
checkoutError = 0;
}
break;

default:
break;
}
}
}//void checkComm0(void)

//取线圈状态 返回0表示成功
uint16 getCoilVal(uint16 addr,uint16 *tempData)
{
uint16 result = 0;
uint16 tempAddr;

tempAddr = addr & 0xfff;
//只取低8位地址
switch(tempAddr & 0xff)
{
case 0:
break;
case 1:
*tempData = testCoil;
break;
case 2:
break;
case 3:
break;
case 4:
break;
case 5:
break;
case 6:
break;
case 7:
break;
case 8:
break;
case 9:
break;
case 10:
break;
case 11:
break;
case 12:
break;
case 13:
break;
case 14:
break;
case 15:
break;
case 16:
break;
default:
break;
}

return result;
}//uint16 getCoilVal(uint16 addr,uint16 *data)

//设定线圈状态 返回0表示成功
uint16 setCoilVal(uint16 addr,uint16 tempData)
{
uint16 result = 0;
uint16 tempAddr;

tempAddr = addr & 0xfff;

switch(tempAddr & 0xff)
{
case 0:
break;
case 1:
testCoil = tempData;
break;
case 2:
break;
case 3:
break;
case 4:
break;
case 5:
break;
case 6:
break;
case 7:
break;
case 8:
break;
case 9:
break;
case 10:
break;
case 11:
break;
case 12:
break;
case 13:
break;
case 14:
break;
case 15:
break;
case 16:
break;
default:
break;
}

return result;
}//uint16 setCoilVal(uint16 addr,uint16 data)

//取寄存器值 返回0表示成功
uint16 getRegisterVal(uint16 addr,uint16 *tempData)
{
uint16 result = 0;
uint16 tempAddr;

tempAddr = addr & 0xfff;

switch(tempAddr & 0xff)
{
case 0:
break;
case 1:
break;
case 2:
break;
case 3:
break;
case 4:
break;
case 5:
break;
case 6:
break;
case 7:
break;
case 8:
break;
case 9:
break;
case 10:
break;
case 11:
break;
case 12:
break;
case 13:
break;
case 14:
break;
case 15:
break;
case 16:
*tempData = testRegister;
break;
default:
break;
}

return result;
}//uint16 getRegisterVal(uint16 addr,uint16 &data)

//设置寄存器值 返回0表示成功
uint16 setRegisterVal(uint16 addr,uint16 tempData)
{
uint16 result = 0;
uint16 tempAddr;

tempAddr = addr & 0xfff;

switch(tempAddr & 0xff)
{
case 0:
break;
case 1:
break;
case 2:
break;
case 3:
break;
case 4:
break;
case 5:
break;
case 6:
break;
case 7:
break;
case 8:
break;
case 9:
break;
case 10:
break;
case 11:
break;
case 12:
break;
case 13:
break;
case 14:
break;
case 15:
break;
case 16:
testRegister = tempData;
break;
default:
break;
}

return result;
}//uint8 setRegisterVal(uint16 addr,uint16 data)
//***********************Modbus.c End*************************//

/****************** Modbus.h Start*******************/
extern uint8 sendCount;
extern uint8 receCount;
extern uint8 sendPosi;

void beginSend(void);
void checkComm0Modbus(void);
void readCoil(void);
void readRegisters(void);
void forceSingleCoil(void);
void presetSingleRegister(void);
void presetMultipleRegisters(void);
void forceMultipleCoils(void);
uint16 getRegisterVal(uint16 addr,uint16 *tempData);
uint16 setRegisterVal(uint16 addr,uint16 tempData);
uint16 getCoilVal(uint16 addr,uint16 *tempData);
uint16 setCoilVal(uint16 addr,uint16 tempData);

/****************** Modbus.h End*******************/
[/code]