RAYTAC MDBT42Q - AT, Руководство пользователя

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3. How to Control via External MCU
3.1. How to Send AT Commands
⚫
When BT is NOT connected, for ALL commands
1.
Output low to UART PD pin to enable UART interface. Please keep it LOW during the
whole time when sending AT commands.
2.
Send any AT commands you want. Please wait for at least 250 ms between sending
each command.
We recommend sending corresponding “Read” command ( section 2.2.2 ) right after the
delay to know whether the writing is successful before moving on to step 3 to save your
settings.
Please prolong the delay (over 250 ms) when writing or/and reading is not successful.
3.
Send command “ AT+RESET ” ( not HW reset ) to save all your settings.
4.
Output high or NC to UART PD pinto turn off UART interface.