关于单片机读卡，比较卡号！急，求大神指教

char ID1[3][5]={0x00,0x09,0x72,0x78,0x36,0x00,0x09,0x72,0x27,0x45,0x00,0x09,0x71,0x88,0x51};
int ID2[3][6]={0x10,0x00,0x09,0x72,0x78,0x36,0x20,0x00,0x09,0x72,0x27,0x45,0x30,0x00,0x09,0x71,0x88,0x51};//ID卡号数组
上面是单片机中先写好的卡号。
        Buff[0]=(Buff[2] & 0xF0) | (Buff[3]>>4 & 0x0F);
        Buff[1]=(Buff[4] & 0xF0) | (Buff[5]>>4 & 0x0F);
        Buff[2]=(Buff[6] & 0xF0) | (Buff[7]>>4 & 0x0F);
        Buff[3]=(Buff[8] & 0xF0) | (Buff[9]>>4 & 0x0F);
BUFF[0] 到BUFF[3]是读出来的ID卡号，怎么写程序，进行卡号的比较呢，卡号一致控制继电器开合。求各路大神指点！~