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E52-400/900NW22S User Manual
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Figure 7.6.1 Routing table
7.7 Additional header information
When the module receives data from other modules, additional frame header information will be added to the serial
port output data.
Frame header meaning:
Frame type
Data length
Network ID
Initial address
Target address
User data
C1
03
34 12
8E 6C
28 64
01 02 03
C3
01
34 12
AA 71
28 64
AA
Frame type: C1 represents unicast frame, C2 represents multicast frame, C3 represents broadcast frame, C4
represents anycast frame;
Data length: user data length, maximum value 200 bytes;
Network identification code: Different networks have different network identification codes. This information
can be used to know which network the source is;
Address: Specifies the source and destination of data;
User data: User data area, maximum 200 bytes.
The address and network identification in the data frame header are low-order first, such as network identification
34 12, which should actually be 0x1234, making it easier to use the structure to parse it.
The data frame header can be turned off through the "AT+HEAD=0" command.
