AT Commands

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AT Commands (Set)

Attention commands, developed by Dennis Hayes, that are used to set data connections. The set of short string commands allow developers to set up calls with a modem, as well as perform far more complex tasks. For an example of an AT command set, take a look at Telit’s 3G module, the HE910, AT command directory.

Source:

http://www.aeris.com/iot-dictionary/

References:

https://en.wikipedia.org/wiki/Hayes_command_set