4G_2G DTU Products Function
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AT+<CMD>[op][para-1,para-2,para-3,para-4…]<CR>
◼ AT+：Command message prefix
◼ CMD：Instruction string;
◼ [op] ：Instruction operator, specified as parameter setting or query
◆ "=" : Indicates parameter setting
◆ "NULL" : Indicates the query
◼ [para-n]: Input when parameter setting, such as query is not required
◼ <CR>: Terminator, carriage return, ASCII code 0x0a or 0x0d
<Notes>：
When user enter a command, the "AT+<CMD>" character is automatically echoed to
uppercase and the parameter portion remains unchanged.
➢ Response Massage
+<RSP>[op] [para-1,para-2,para-3,para-4…]<CR><LF><CR><LF>
◼ + : Response message prefix;
◼ RSP: Respons string, including:
◆ “ok” : Indicate success
◆ “ERR”: Indicate failure
◼ [op] ：=
◼ [para-n] : Return parameters when querying or error code when error
occurs
◼ <CR>: ASCII code 0x0d；
◼ <LF>: ASCII code 0x0a；
➢ Error Code
Error Code Description
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