main.h

这是一个用于RS485通讯的协议转换程序,采用89S52芯片,KEIL 51开发

//变量类型标识的宏定义
#define	Uchar unsigned char 
#define Uint unsigned int

// 控制引脚定义，不同的连接必须修改的部分
sbit	RD1	= P2^0;
sbit	RD2	= P2^1;
sbit	RD3	= P2^2;
sbit    RD4 = P2^3;

sbit    BUSY1 = P2^4;
sbit    BUSY2 = P2^5;
sbit    BUSY3 = P2^6;
sbit    BUSY4 = P2^7;

sbit    RDEN1 = P1^0;
sbit    RDEN2 = P1^1;
sbit    RDEN3 = P1^2;
sbit    RDEN4 = P1^3;
sbit    WREN1 = P1^4;
sbit    WREN2 = P1^5;
sbit    WREN3 = P1^6;
sbit    WREN4 = P1^7;

sbit    RT_CON1 = P3^3;
sbit    RT_CON2 = P3^4;

#define DataPort P0				// 数据端口