At Command; Default Parameter For At Command; At Command Description; At Command Error Code - Ebyte E90-DTU User Manual

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7. AT command

7.1 Default Parameter for AT command

7.2 AT Command Description

1. The AT command is character content;
2. The AT command ends with "\r\n" (the description of \r\n will not be repeated later).
3. The AT command does not distinguish between upper and lower case.
4. The numeric type of the unspecified type parameter in the AT command is a decimal string.

7.3 AT Command Error Code

Error Code
-1
-2
-3
-4

7.4 AT Command List

7.4.1 AT Test

Note: +Ok means the DTU has enter AT mode
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Baud rate
Parity
Flow Control
Communication link
Description
The parameter length is wrong or
empty
Parameter data error
Instruction does not exist
No terminator (\r\n)
Command
AT
115200 bps
0（parity disabled）
0（off）
1
Possible reason for the error
Compare the instruction parameter range described in the
instruction table, the instruction does not carry
parameters
Compare the instruction parameter range described in the
instruction table
Compare the instruction format described in the
instruction table
Serial port tool not selected: send a new line
Reply
+OK
E90-DTU(2G4HD12) User Manual
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