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3.3. AT Command Reference
This section defines the serial AT commands that can be sent to the module.
3.3.1. AT Commands
All AT commands begin with an ASCII "AT", followed by a two ASCII character command, and
followed by optional parameters depending on the command. The prefix "AT" can be used
standalone to determine if a device is available, out of reset, boot-loading complete and
responding. Upon sending "AT" with no additional command or payload, the device should
respond "CMD OK" if it is alive. This command may be used during a system boot-loading
process where a bootloader delay is used to determine if the device is ready.
3.3.1.1 AT – Attention
This is the basic standalone command to determine if a device is available, out of reset, boot-
loading complete and responding. Upon sending "AT" with no additional command or
payload, the device should respond "CMD OK" if it is alive. This command may be used during
a system boot-loading process where a bootloader delay is used to determine if the device is
ready.
3.3.1.2 WR – Write Configuration
Writes current configuration to non-volatile memory and loaded automatically after next
reset.
3.3.1.3 RE – Restore Parameters
Restore parameters to factory reset defaults. However, the default values are not written to
flash.
3.3.1.4 FR – Factory Reset
Factory reset the device. Resets all parameters and clears non-volatile memory and writes the
defaults to flash.
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