每片DS1991内部都有在工厂 光刻的48位序列码，为唯一的身份验证提供了保证，也确保了可绝对跟踪功能；
A 48-bit serial number is factory lasered into each DS1991 to provide a guaranteed unique identity which allows for absolute traceability.
每片DS1991内部都有在工厂 光刻的48位序列码，为唯一的身份验证提供了保证，也确保了可绝对跟踪功能；
A 48-bit serial number is factory lasered into each DS1991 to provide a guaranteed unique identity which allows for absolute traceability.
应用推荐