Data Format

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The message data format is 24 bytes fixed-size data including the header, commands, parameters and footer.

Byte Offset Type Byte Length Value
0-1 Header 2 Byte[0] 0x2A [*]: (fixed value)
Byte[1] 0x53 [S]: (fixed value)
2 Message Type 1 0x43 [C]: Control
0x45 [E]: Enquiry
0x41 [A]: Answer
0x4E [N]: Notify
3-6 Command 4  
7-22 Parameters 16  
23 Footer 1 0x0A [LF]: (fixed value)

Header

Each message always has the fixed header (0x2A 0x53), which identifies the beginning of the message.

Message Types

There are 4 message types.

Message Type Value Message Direction Description
Control 0x43 [C] Client to Display Used to control or change values on the Display
Answer message is used to reply
Enquiry 0x45 [E] Client to Display Used to control or change values on the Display
Answer message is used to reply
Answer 0x41 [A] Display to Client Used to send a reply back to the client from the Display
Notify 0x4E [N] Display to Client Used to send an event to the client from the Display

Commands and Parameters

Each command is identified by four ASCII characters represented in Four-CC format, and has parameters. The details of commands and parameters are described in Simpe IP control Commands.

Footer

Each message always has the fixed footer (0x0A), which identifies the end of the message.

Last modified: 6 Mar 2019