Data Protocol - Ebyte E810-DTU User Manual

Chengdu Ebyte Electronic Technology Co.,Ltd
(rate less than 5Kbps).
With error detection, error notification, and error recovery.

Failure closure function.

Multiple Connection Nodes.


4.2.2. Data protocol

When the E810-DTU (CAN-ETH) network sends data to the CAN, the data must conform to the data protocol
before it can be sent out from the CAN bus. Similarly, when the CAN end of E810-DTU (CAN-ETH) receives the data
from the CAN bus, it will process the data into data conforming to the data protocol, and then send it to the network end.
One Ethernet data can contain several CAN bus data that conform to data protocol.
The E810-DTU (CAN-ETH) data protocol conversion format is as follows, each CAN frame contains up to 13 bytes,
and the 13-byte content includes CAN frame information + frame ID + frame data.
......
CAN frame
Frame information: 1 byte in length, used to identify some information of the CAN frame, such as type,
length, etc.
BIT7
FF
The identification bits of standard frame and extended frame, 1 for extended frame and 0 for standard frame.
FF:
Identification bit of remote frame and data frame, 1 for remote frame and 0 for data frame.
RTR:
The reserved value is 0 and cannot be written to 1.
Reserved:
Data Length Bit, which identifies the data length of the CAN frame.
D3～D0:
4 bytes in length, 11 bits in standard frame and 29 bits in extended frame.
Frame ID：
High byte
12h 34h
The above is the extended frame ID number.
Representation of 0x12345678
Copyright ©2012–2019, Chengdu Ebyte Electronic Technology Co.,Ltd
CAN frame
RTR Reserved Reserved
Low byte
56h 78h
...
CAN frame CAN frame
D3
High byte
00h 00h
The above is the standard frame ID number
Representation of 0x123
E810-DTU(CAN-ETH) User Manual
CAN frame
BIT0
D2 D1
Low byte
01h 23h
D0
24