移远4G模块相关资料，非常详细，对模块开发非常有用(Quectel 4G module related data, very detailed, very useful for module development)

移远EC20（LTE通讯模块）相关资料。包括硬件资料和相关AT指令。(Quectel EC20 (LTE communication module) related information. Including hardware information and related AT instructions.)