机顶盒卡通讯代码，主要工作是读取卡内的基本信息，如卡号、运营商等信息，在智能卡 Reset 后必须首先执行，之后才可以执行其他的命令 -Communications set-top box card code, the main task is to read the card' s basic information, such as card numbers, operators and other information, after Reset in a smart card must first be implemented, then it may order the implementation of other