# Introduction Source: [https://docs.qualcomm.com/doc/80-Y8730-10/topic/qcc730_at_command_introduction.html](https://docs.qualcomm.com/doc/80-Y8730-10/topic/qcc730_at_command_introduction.html) The primary purpose of this document is to provide a comprehensive overview of AT commands and their application. This document aims to help developers and engineers effectively utilize AT commands to control QCC730, enabling seamless communication and data exchange. ## AT command format Source: [https://docs.qualcomm.com/doc/80-Y8730-10/topic/qcc730_at_command_introduction.html](https://docs.qualcomm.com/doc/80-Y8730-10/topic/qcc730_at_command_introduction.html) There are three types of AT command. | Type | Format | Role | | --- | --- | --- | | Query | AT+<x>? | Get device configuration settings | | Set | AT+<x>=<…> | Set device configuration settings | | Execution | AT+<x> | Execute a function | Note: - Not all AT commands have the three command types mentioned above. - Only strings and integer numbers are supported as input parameters in AT commands. - Angle brackets `<>` designate parameters that can't be omitted. - Parameter omission isn't supported yet, will be supported later. - A string included in `""` is treated as a single parameter even if it contains separators such as comma or space. - Each AT command should not exceed 256 bytes in length. - Multiple AT commands can be combined in one line with the `;` separator. - AT commands end with a new-line (CR-LF). ## AT message format Source: [https://docs.qualcomm.com/doc/80-Y8730-10/topic/qcc730_at_command_introduction.html](https://docs.qualcomm.com/doc/80-Y8730-10/topic/qcc730_at_command_introduction.html) There are four types of message formats as listed in the following table. | Response message | Description | | --- | --- | | OK | Return `OK` if the AT command is processed successfully | | ERROR | Return `ERROR` if any error occurs when processing the AT command | | +EVT:… | Return `+EVT:…` if there is any event from AT target | | +<Command name>:… | Response to the sender, which describes the AT command process results in details | Last Published: Jun 03, 2026 [Previous Topic Revision history](https://docs.qualcomm.com/bundle/publicresource/80-Y8730-10/topics/revision_history.md) [Next Topic Basic AT commands](https://docs.qualcomm.com/bundle/publicresource/80-Y8730-10/topics/basic_at_commands.md)