AT Mode Configuration Guide
Last revision 2025/12/29
This guide details the process of configuring AT mode including entering AT CMD Mode, setting Baud rates, and troubleshooting commands for successful BLE communication.
<CR+LF> means Carriage-Return and Line-Feed, which is the same meaning with "Both NL & CR" in Arduino Serial monitor
Do not include the string "<CR+LF>" itself
The AT Mode Switch is not work at Firmware version V1.8 or later.you can enter the command "+++" in serial port monitor with "No line ending" to enter the AT CMD Mode.
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Select the "Both NL & CR" and 115200 baud in the two pull-down menu
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Type or copy the AT command in the dialog like this and press send button
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If the BLE is successfully configured , you will receive "OK" from it
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If received "ERROR CMD" instead, try sending it again or you should check whether the command is correct or not.
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reset the Bluno nano or enter the “AT+EXIT” can exit the AT CMD Mode.
Note: STABLE POWER Please make sure to provide the BLE module with a reliable and stable 3.3V power supply whose noise should be less than 10mV, or its bootloader and the BT service will get lost.
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