Technica Engineering CM CAN Combo - Technical Protocol Details and Support; 6.1 Complete ethernet frame containing a TECMP frame

CM CAN Combo User Manual
62
6 EXCERPT OF TECMP
6.1 Complete ethernet frame containing a TECMP frame
The logged data is inserted into a TECMP frame as payload. Please check the
following table:
PRE/
SFD
DST
MAC
SRC
MAC
Outer
802.1Q
Header
(optional)
Inner
802.1Q
Header
(optional)
Ether
Typ
0x99FE
TECMP
Header
Source
Data
FCS/
CRC
8 bytes
6 bytes
6 bytes
4 bytes
4 bytes
2 bytes
28 bytes
Up to n
bytes (n <=
1500
bytes)
4 byte
Table 6-1: Complete frame
Field
Description
PRE / SFD
Preamble and Start Frame Delimiter according to IEEE Standard 802.3.
DST MAC
The destination MAC address must be assigned to the multicast address:
01:00:5E:00:00:00
SRC MAC
The source MAC address carries the MAC address of the Capture Modules.
VLAN 802.1Q
optional VLAN fields are provided for possible future extensions.
EtherType
0x99FE: TECMP - Identifies this packet as TECMP packet
TECMP header
See following chapter
Source Data
See following chapter
FSC - CRC
CRC checksum, calculated according to IEEE Standard 802.3
6.2 TECMP header
NOTE: In general, all unspecified number types are UINT. The header structure is
identical for all messages, that are logged via the capture module.