Ebyte ECAN-401 User Manual page 17

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1Byte 4Byte
The frame information is shown in Table 1.1
The length of the frame ID is 4 bytes, the standard frame valid bit is 11 bits, and the extended frame valid bit is 29 bits.
Extended frame ID number
0x12345678
0x12 0x34
1. Convert serial frame to CAN message
In the process of converting a serial frame to a CAN message, in a serial data frame aligned with a fixed byte (13 bytes),
if the data format of a certain fixed byte is not standard, the fixed byte length will not be converted. Then convert the
following data. If you find that some CAN messages are missing after conversion, please check whether the fixed byte
length serial data format of the corresponding message does not conform to the standard format.
2. Convert serial frame to CAN message
When the frame data is converted in CAN format, the length is fixed to 8 bytes. The effective length is determined by the
value of DLC3~DLC0. When the effective data is less than the fixed length, it needs to be filled with 0 to the fixed
length.
In this mode, it is necessary to pay attention to the serial data format in strict accordance with the fixed byte format to
successfully convert. The CAN mode conversion can refer to the example (CAN format conversion standard frame
example). When converting, first ensure that the frame information is correct and the data length indicates No errors,
otherwise no conversion will be performed.
Conversion example:
Serial frame to CAN message (protocol mode).
CAN configuration parameters configured in this example. Conversion mode: protocol mode, frame type: extended
frame, conversion direction: two-way. Frame ID: No need to configure, the data before and after conversion is as follows.
Serial frame to CAN message (protocol mode)
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0x56 0x78
Serial frame
88
17
65
43
21
99
88
77
66
55
44
33
22
8Byte
Standard frame ID number
0x3FF
0x00 0x00 0x03
CAN Message
Frame
88
information
17
65
Frame ID
43
21
99
88
77
66
Data field
55
44
33
22
ECAN-401 User Manual
0xFF
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