User's Manual

The direction parallel to the antenna does not allow copper to be laid or routed. It is also a good
choice to directly expose the antenna part out of the carrier board.
4. It is recommended to use insulating material for isolation at the module mounting position
on the substrate. For example, put a block of screen printing (TopOver Lay) at this position.
11. AT COMMAND
1. When sending AT commands, you need to pull module P26 low to enter the AT command
mode. At other times, the commands do not respond.
2. AT command, which belongs to the character line instruction, is parsed according to the line
(AT command must be returned by carriage return or \r\n, hexadecimal number is 0D0A)
3. The AT command only supports uppercase. The instruction prefix is AT+ and can be divided
into parameter setting instructions and read instructions.
4. Set the instruction format: AT+<CMD>=<PARAM> The operation succeeds.
Return:+<CMD>=<PARAM>\r\n OK\r\n Fail Back:ERR\r\n
5. Read instruction format:
AT+<CMD>? Operation succeeds: +<CMD>=<PARAM>\r\nFailed to return ERR\r\n
6. instruction error or not support, return ERR\r\n
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