华为GTM900模块AT指令集，全套使用说明。-Huawei GTM900 module AT command set, a full set of instructions.

华为GTM900C的AT指令集，详细的介绍了GTM900c下面的指令以及用法-Huawei the AT command GTM900C set, detailed descr iption of the instructions and directions of the GTM900C below