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USB(串口)CAN转换的定义&&串口CAN协议二次开发文档(文件:USB_(Serial_port)_to_CAN_protocol_defines).pdf
The definition of the serial (USB) conversion
CAN protocol
The serial port baud rate default is 2000000, 8 bit data bit,
1 bit stop bit, no check. Two communication protocols are
supported within the converter, one is a fixed 20 byte
communication protocol, and the other is a variable length
communication protocol.
1. Variable length communication format
When
the
software
is
not
selected
,
(for example, the red line is checked in the box above), click
setup and start button. The internal communication of the
converter is a variable length communication protocol. The
specific protocol is as follows:
Definition
Packet header 0xaa
Tyep
0xc0 Tyep
bit5(frame type 0- standard frame (frame ID 2 bytes), 1-extended
frame (frame ID 4 bytes))
bit4(frame format 0- data frame, 1 remote frame)
Bit0~3 Frame data length (0~8)
1~8 bit (BYTE1)
1~8 bit (BYTE1)
Frame ID
Extended
9~16 bit (BYTE2)
Standard
frame
17~24 bit (BYTE3)
Frame
9~11 bit (BYTE2)
25~29 bit (BYTE4)
CAN sends or accepts data 1
Frame data
CAN sends or accepts data 2
(frame data
CAN sends or accepts data 3
may be 0~8
CAN sends or accepts data 4
data)
CAN sends or accepts data 5
CAN sends or accepts data 6
CAN sends or accepts data 7
CAN sends or accepts data 8
End code
0x55
Sample description (standard frame):
1. For example, send the CAN standard frame ID to 0x123, and the corresponding
data as 0x11 0x22 0x33 0x44 0x55 0x66 0x77 0x88
Then the serial port sends data format to AA C8 23 01 11 22 33 44 55 66 77 88 55
The following is an explanation
AA Packet header
C8 Bit5 is 0 standard frame, bit4 is 0, data frame bit0~3 is 8, data length is 8,
sending 8 bytes
23 01 For the frame ID 0x123
11 22 33 44 55 66 77 88 Send frame data for CAN
55 End code
For example, the serial port is received:
AA C8 23 01 11 22 33 44 55 66 77 88 55
The received CAN is the standard frame, ID is 0x123, the corresponding data is 11
22 33 44 55 66 77 88, 8 bytes, and the resolution is the same as above
2. For example, send CAN standard frame ID to 0x103, and the corresponding data
is 0x 11 0x22
Then the serial port sends data format to:
AA C2 03 01 11 22 55
The following is an explanation:
AA Packet header
C2 bit5 is 0 standard frame, bit4 is 0, data frame bit0~3 is 2, data length is 2,
sending 2 bytes
03 01 For the frame ID 0x103
11 22 Send frame data for CAN
55 End code
For example, the virtual serial port is received:
AA C2 03 01 11 22 55
The received CAN is the standard frame, ID is 0x0103, the corresponding data is 11
22, 2 bytes, and the resolution is the same as above
Sample description (extended frame):
1. For example, the CAN extended frame ID is 0x1234567, and the corresponding
data is 0X11,
0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88
Then the serial port sends data format to:
AA E8 67 45 23 01 11 22 33 44 55 66 77 88 55
The following is an explanation:
AA Packet header
E8 Bit5 is 1, extended frame bit4 is 0, data frame bit0~3 is 8, data length is 8,
sending 8
bytes
67 45 23 01 For the frame ID 0x1234567
11 22 33 44 55 66 77 88 Send CAN frame data
55 End code
For example, the serial port is received:
AA E8 67 45 23 01 11 22 33 44 55 66 77 88 55
The accepted CAN is an extended frame, ID is 0x1234567, and the corresponding
data is 11 22 3344 55 66 77 88, 8 bytes, parsed as above
2. For example, the CAN extended frame ID is 0x1033021, and the corresponding
data is 0x 11 0x22:
Then the serial port sends data format to:
AA E2 21 30 03 01 11 22 55
The following is an explanation:
AA Packet header
E2 Bit5 is 0, extended frame bit4 is 0, data frame bit0~3 is 2, data length is 2,
sending 2 bytes
21 30 03 01 For the frame ID 0x1033021
11 22 Send CAN frame data
55 End code
For example, the serial port is received
AA E2 21 30 03 01 11 22 55
The accepted CAN is an extended frame, ID is 0x1033021, and the corresponding
data is 11 22, 2 bytes, parsed as above
2. Fixed 20 byte transceiver protocol
When the software is selected
,
(for example, the red line is checked in the box above), click
setup and start button. The definition of the converter's
internal communication
is fixed 20 byte transceiver
definition. The specific protocol is as follows.
0
1
2
3
4
5
6
7
8
9
Definition
Packet header
Packet header
0xaa
0x55
TYPE
0x01-Data
Frame type
Frame format
Frame ID data 1
0x01-Standard frame, 0x02-Extended frame
0x01- Data frame，0x02-Remote frame
1~8 bit, high bytes at the front, low bytes at the back
Frame ID data 2
9~16 bit, high bytes at the front, low bytes at the back
Frame ID data 3
17~24 bit, high bytes at the front, low bytes at the back
Frame ID data 4
25~32 bit, high bytes at the front, low bytes at the back
Frame data length
The data length of the CAN bus that is sent or accepted
CAN sends or accepts data 1
CAN sends or accepts data 2
CAN sends or accepts data 3
CAN sends or accepts data 4
CAN sends or accepts data 5
CAN sends or accepts data
CAN sends or accepts data 7
CAN sends or accepts data 8
0x00
From frame type to error code, accumulating and low 8 bits
(red part)
Frame data 1
Frame data 2
Frame data 3
Frame data 4
Frame data 5
Frame data 6
Frame data 7
Frame data 8
Reserve
Check code
10
11
12
13
14
15
16
17
18
19
For example, we accept or send the data standard frame ID to 0x123, and the data
is 11 22 33 44 55 66 77 88
It is configured as follows
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
Packet header
Packet header
TYPE
Frame type
Frame format
Frame ID data 1
Frame ID data 2
Frame ID data 3
Frame ID data 4
Data
0xaa
0x55
0x01
0x01
0x01
0x23
0x01
0x00
0x00
Frame
length
data
0x08
Frame data 1
Frame data 2
Frame data 3
Frame data 4
Frame data 5
Frame data 6
Frame data 7
Frame data 8
11
22
33
44
55
66
77
88
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