Page
21
of
43
Note:
When the
Length
field is 0x00, the CAN frame will be sent like a remote frame. In CAN-FD there
is not remote frames according with the CAN-FD specification.
Note:
100BASET1_SPY is able to sent CAN frames with ID priority. When a burst of three messages is
received in the Ethernet port, the device will send them according with their priority, following the
CAN specification.
5.4.5.2
CAN Transmission Event Message
When a CAN frame is sent through a CAN port, an Ethernet Frame is sent through the Gigabit Port
specified in the Output To field for that CAN port (see section 5.4.5). This CAN Event Message con-
tains information about the state of the transmission, as is described in the following table:
Note:
The
Transmission Status
field contains the following information about the CAN transmission
state:
7
6
5
4
3
2
1
0
Reserved COLLISION
Reserved
RTR
Reserved
SENT
Reserved
ACK
o
ACK: A ‘1’ value in this bit indicates if there was an acknowledge during the transmission of
the CAN frame.
o
SENT: A ‘1’ value in this bit indicates if the CAN frame was transmitted successfully.
o
RTR: A ‘1’ value in this bit indicates if the CAN frame is a remote frame.
o
COLLISION: A ‘1’ value in this bit indicates if there was a collision with another frame during
the transmission. If there is a collision, the SENT field will be ‘0’.
Field Name
No. Of Bytes Value
Destination MAC Address
6
FF:FF:FF:FF:FF:FF
Source MAC Address
6
It depends on the source Ethernet Adapter
Ethertype
2
0x2085
Direction
1
0x00 (TX Frame)
Message Type
1
0x01 (CAN Event Frame)
Port number
1
From 0x01 to 0x05
Frame Length
2
Length of the Ethernet Frame
Transmission Status
1
Information about the state of the transmission
CAN ID
4
CAN ID transmitted