Using AT Commands

This content support products:

1. Mini DTU(Y201)
2. RS485/RS232 DTU(Y202)

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Those devices supports both serial AT and network AT for parameter querying and configuration. For details on switching to serial AT mode.

AT Command Guidelines:

• Prefix and Suffix: All AT commands must start with "AT+" and end with "\r" or "\n".
• Case Sensitivity: AT commands are not case-sensitive, but uppercase letters are recommended.
• Single Command per Line: Only one AT command is allowed per line. The maximum length of a single command is 256 bytes.
• Parameter Separation: Multiple parameters within a command must be separated by commas (",").
• Command Execution Sequence: Ensure that the previous command has returned a response before sending a new one. The maximum timeout for a command is 12 seconds.

WARNING

All AT commands end with characters \r\n.

Read commands

AT+CMD

Response as:

CMD:value
OK

Set commands

AT+CMD=value1,value2…

Response as:

OK

Get help for a command

Some commands need parameters, use get help commands for details.

AT+CMD?

Response as:

CMD:param1:detail1,param2:detail2...
OK

Commands

List all commands:

AT+LIST

Reboot device:

AT+REBOOT

Reset device:

AT+RSTCFG

Reset device:

AT+RSTCFG

Error Code

When the command execution fails, the device will issue an error code. The format of the error code is: \r\n+ERROR:Error_Code\r\n. The description corresponding to the error code can be found in following:

Error Code	Detail
ARGS	Invalid parameters: parameter length, size, format, etc.
ARGC	Invalid number of parameters: incorrect number of parameters.
CMD_UNKNOWN	Unknown command: command does not exist.
CMD_FORMAT	Format error: does not start with AT+.
CMD_LENGTH	Length error: exceeds maximum command length.
DEV_MEMORY	Memory error: memory error.
DEV_SAVE	Save failed: save failed.

Exiting AT command mode

In AT command mode, you can switch to transparent mode by using the command AT+EXIT or by restarting the device.