modbus实例.docVIP

#includereg52.h #includeabsacc.h #includeintrins.h #includectype.h /* These macro define simple data type 定义简单的数据类型*/ #define uchar unsigned char #define ulint unsigned long #define uint unsigned int /* These macro for Mudbus function code ：mudbus 功能码*/ #define ReadCoilSta 0x01 // 0X read coil function 读线圈 #define ForceSingleCoil 0x05 // 0X force single coil function 写线圈 #define ReadHoldReg 0x03 // 4X read input register 读寄存器 #define PresetMulReg 0x06 // 4X write multi register 写寄存器 /* These macro describe index of communiction message from start to end */ #define CommIndexSlaveID 0 // macro for slave ID 站号 #define CommIndexFunction 1 // macro for function code 的功能码 #define CommIndexStartAdrHi 2 // macro for data hight adr 地址高位 #define CommIndexStartAdrLo 3 // macro for data low adr 地址地位 #define CommIndexNoPointHi 4 // macro for hight quantity datas 数据高位 #define CommIndexNoPointLo 5 // macro for low quantity datas 数据低位 /* These macro describe recieve message lenght of different function code */ /* But not include data lenght ,the data is master write to slave */ /* because we dont know the data lenght prior, it depend on ComBuf[ComIndexNoPoint] value */ #define ReadCoilStaIndexEnd 7 // 0~7,0x01,0X #define ForceSingleCoilIndexEnd 7 // 0~7,0x05,0X #define ReadHoldRegIndexEnd 7 // 0~7,0x03,4X #define PresetMulRegIndexEnd 7 // 0~8,0x10,4X /* these macro describe send or recieve allowed */ #define SEND 1 // send allowed 允许发送 #define RECIEVE 0 // recieve allowed 允许接收 #define SlaveID 0x01 // the slaves ID #define SendRecieveDelay 50 // Send turn to Recieve or Recieve turn to Send delay time vlaue 发送与接收转换 时间 #define MaxDataLen 30 // preset CommBuf array Max length 通讯缓冲区max 长度 #define MaxRegLen 20 // preset SlaveOutputBuf Max lenght /* variable for modbus is following 变量定义*/ bit data RecFinishF; uchar data CommIndex; uchar data writeadr; uchar data CommIndexEnd; u