Modbus Tcp Protocol Data Frame Description - Ebyte ME31-AAAX2240 User Manual

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Select the setting item, enter the parameter configuration page and press the up and down keys to switch the setting
item;
Select the setting item, short press to confirm or right click, the setting item gets the cursor to indicate that it is
selected and enters the setting item;
Adjust parameter value: After selecting the setting item, the up and down keys can change the value or optional
value; the left and right keys can move the cursor in the parameter item;
Determine the parameter value: After adjusting the parameter value, press the enter key to exit the current setting
item.
Save the parameter setting and exit: After setting the parameter, move the cursor to the exit option and press the
middle button to save the parameter and exit the parameter setting, or long press the middle button after any
parameter item to determine the parameter value to save the parameter and exit.
Exit parameter setting.
Exit without saving parameters: automatically exit the parameter setting interface after 30 seconds without any
operation on the parameter setting interface, and the parameters will not be saved.

4.9 Modbus TCP protocol data frame description

TCP frame format：
Transaction ID Protocol ID
2 Bit
 Transaction identification: It can be understood as the serial number of the message. Generally, 1 is added
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Length
2 Bit N+2 Bit
Device Address Function Code
1 Bit 1 Bit
ME31-AAAX2240_UserManul_EN
Data Segment
N Bit
21