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    Home News Center Product News
    April 29, 2020 Overview of the AT Directive

     After the power-on is successfully started, the module can be set through the UART.

    The default UART port parameters of the module are: baud rate 115200, no parity,
    8 data bits, 1 stop bit.
     
    <Description>
    AT command debugging tool, UART interface is recommended to use SecureCRT software
    tool or someone professional APP application. The following descriptions are all
    demonstrated using UART communication and SecureCRT tools.
    Switching from transparent mode to command mode requires the following two steps:
    输入 Enter “+++” on the UART, and the module will return a confirmation code “a”
    after receiving “+++”;
    输入 Enter the confirmation code “a” on the UART. After receiving the confirmation
    code, the module returns “+OK” to confirm and enter the command mode.
    QQ图片20190530114109.png
    <Description> When "+++" and the confirmation code "a" are input, there is no echo, as
    shown in the figure above.
    Entering "+++" and "a" needs to be completed within a certain period of time to
    reduce the probability of entering the command mode by mistake during normal operation.
    Specific requirements are as follows:
    QQ图片20190530114144.png
    Time requirements:
    T1 > Serial port packing interval
    T2 < 300ms
    T3 < 300ms
    T5 < 3s
    Timing for switching from transparent mode to temporary command mode:
    1. The serial device sends “+++” to the module continuously. After the module
    receives “+++”, it will send an ‘a’ to the device. No data can be sent during
    the packing time before "+++" is sent.
    2. When the device receives ‘a’, it must send an ‘a’ to the module within
    3 seconds.

     

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