ZLG CANFDNET-400U Product User Manual page 38

CANFDNET-400U
High-performance Four-channel CANFD Bus-to-Ethernet Converter User Manual
Table 4.28 CAN communication frame mutual conversion format (Modbus mode)
Modbus RTU
frame
Address field
Function Code
Data field
CRC field
Table 4.29 CANFD communication frame mutual conversion format (Modbus mode)
Modbus RTU
frame
Address field
Function Code
Data field
CRC field
The CRC check byte of the Modbus RTU frame is not converted into the CAN
(CANFD) message, and the CAN (CANFD) message does not need to have the check
byte of the serial frame, because the CAN (CANFD) bus itself has an excellent verification
mechanism.
The converted data is the function code and data field of the protocol content of
CAN
CAN message 1
message
Frame
Frame information
information
Frame ID3 0x00
Frame ID 2 0x00
Frame ID1 0x00
Frame ID0 Address field
[Segmentation
Data 1
protocol usage]
Data 2 Function Code
Data 3
Data 4
Data 5
Data field
Data 6
Data 7
Data 8
CANFD CANFD message
message
Frame
Frame information
information
Frame ID3 0x00
Frame ID 2 0x00
Frame ID1 0x00
Frame ID0 Address field
[Segmentation
Data 1
protocol usage]
Data 2 Function Code
Data 3
Data 4
Data...
Data field
Data 62
Data 63
Data 64
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User Manual
CAN message x
Frame information
0x00
0x00
0x00
Address field
[Segmentation
protocol usage]
Data field
CANFD message
1 x
Frame information
0x00
0x00
0x00
Address field
[Segmentation
protocol usage]
Data field