100BASE-T1 SPY 12 Port
User Manual
26
available, 62 and 75, and if the user selects any other value, it will adjust to the most
approach allowed value.
Warning:
If the 5Mbps FD Rate needs to be used, please make sure that the transceiver
of the opposite device can work with rates higher than 2Mbps.
3.4.4.1
CAN Transmission data use case
In the Passive or Active Node modes, any of the 100BASET1_SPY CAN port can act as
transmitters according with the CAN protocol communication. In this case, a specific
Ethernet frame received on GB Port A will be sent through a specific CAN Port. The
following table shows the structure of the Ethernet CAN Transmission data frame used
for this purpose:
Field Name
N
º
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)
Port Number
1
From 0x01 to 0x05
Message ID
1
From 0 to 255
Frame Length
2
Length of the whole Ethernet frame (bytes)
CAN ID
4
CAN ID
CAN Length
1
Length of the CAN frame (bytes)
CAN Payload
0 to 64
Its length depends on the Length field
Table 3-1: Table for example values in an Ethernet CAN Transmission data frame
Note:
All the values are expressed in hexadecimal.
Note:
The value of the
Port Number
depends on the CAN port where the user wants to
send the CAN frame. Its values can be the following:
Port
Value
CAN A
0x01
CAN B
0x02
CAN C
0x03
CAN D
0x04
CAN E
0x05
Table 3-2: Table for values of CAN Port
