modbus.h

ModBus协议的实现源码

#include "reg51.h"
#include "ModBusStr.h"

#define uchar unsigned char
#define uint unsigned int
#define uint8 unsigned char
#define uint16 unsigned int

#define OK 1
#define ERROR 0

#define RIGHT 1
#define WRONG 0


#define    POOLLEN  255              //缓冲区大小

#define    INIT_COMMAND   0x20
#define    START_COMMAND  0x21
#define    END_COMMAND    0x22
#define    ALARM_COMMAND  0x23


#define    FRAME_START    0x7e         //帧开始标志
#define    FRAME_END      0x0d         //帧结束标志
#define    VER    0x10
#define    ADDR   0x01


#define    M_CID   0x25                //设备识别码，0x25代表直流电源柜

extern    StrRxd xdata sys_rxd;
extern    StrTxd xdata sys_txd;

extern    void    init_proc_rxd(void);
extern    void    process_rxd(void);
extern    void    init_serial(void);

extern    uint8 lchksum(uint8  data_len);
extern    void txd_sta(void);
extern    void txd_man(void);
extern    void txd_uni(uint8 cid2);