1、异步操作方式。设备连接和短信发送均采用异步方式，即容器程序调用连接函数或发送函数后立即返回。由控件自行完成连接或发送过程，当操作完成后，将执行结果以事件的形式通知容器程序。

2、内部包含收发缓冲队列。控件可以同时接受容器程序较多的发送请求，控件将这些发送请求放到一个发送队列中，控件依次逐个执行该发送队列，并将执行结果以事件的形式通知容器程序。控件包括了内部发送队列和内部接收队列，并且提供了队列的处理情况的访问方法，根据这个特性，容器程序可以连续提交多个短信发送请求；

3、支持多个控件并行工作。在一个程序中使用可以使用多个短信控件（即同时连接多个GSM Modem设备）时，如果要发送一条短信，容器程序可优先选择发送队列为空的短信控件发送，或者选择发送队列中剩余发送条数最少的短信控件发送。

-1, asynchronous mode of operation. Connectivity and equipment were used to send messages asynchronous modes, namely containers Invoking connecting function or sent immediately after the function returns. By linking its own control or sent to the process, when the operation is completed, the results will be implemented in the form of Vessel notification procedures. 2, the internal transceiver contains a buffer queue. Controls can also accept containers of this process more requests, these controls will be placed in a request sent this cohort, the controls were sent individually to implement the queue, and will result in the implementation of the notification procedures containers. Internal controls include the sending queue and receive internal queue and the queue for the treatment of the a