专门针对医药零售的POS系统，支持按批次销售，销售过程中进行负库存拦截、支持常用POS，电子称以及按销售员分组销售，支持大并发操作，支持断电保护等功能-Specifically for pharmaceutical retail POS systems and support by installment sales, the sales process to intercept the negative inventory, support for commonly used POS, e s