说明：  水控POS机的程序，刷卡后，开启水阀门，热水流出来，正常状态下，显示POS机号，刷卡后，显示帐户的金额
(Water control POS machine procedures, credit card, open the water valve, hot water out of the normal state, shows its POS machines, credit card after the account shows the amount of)