数据都会莫名其妙的改变数值。实际的字节数仅仅90字节，应该不会超过范围呀？我用的是stc的库。这几天一直再调，就是不行。麻烦您给指导下，小弟不胜感激。
unsigned char xdata bh[2];
unsigned char xdata sjzt[2];
unsigned char data num;
unsigned char data head;
unsigned char xdata zj_re_sbuf[8];
unsigned char xdata zj_re_sbuf2[8];
bit zj_re_flag;
unsigned char data k4_re_sbuf[12];
unsigned char data k4_re_sbuf2[12];
unsigned char data k4_num;
unsigned char data k4_head;
bit k4_re_flag;
bit k4_ok_flag;
unsigned char data dx_send_sbuf[16];
unsigned char data id_new[5];
unsigned char data led_time;
unsigned char data sjzt_hc;
unsigned char data sjzt_hc1;
bit busy,busy2;