Owner
Nicklas Andersson
Date
2020-09-08
Classification
Document number
5610_40037
Revision
1.4
Title
VCM User Manual
Page
7(9)
4
Functional Description
4.1
Diagnostics
4.1.1
DoIP connection
The DoIP interface in the vehicle is located in the OBD connector.
When a test equipment is connected on the OBD Ethernet port, the VCM presents itself on the
network using a “Vehicle Announcement Message”, as specified in ISO 13400-2. Based on the
content of this message, an external tester tool can connect to the VCM and create a diagnostic
session.
4.1.2
CAN connection
The diagnostics over CAN interface is also located in the OBD connector.
To communicate with the VCM and the ECUs behind the VCM in the vehicle topology, the
diagnostic requests shall be sent with 29-bit addressing.
The same CAN interface is used for legislated ODB diagnostics. For such purposes, 11-bit
addressing is used. Such CAN traffic does not affect the VCM.
4.1.3
WLAN
Diagnostics functionality is also available via WLAN. The unit ca be set in a mode where it acts
like a WLAN station and attaches to a hotspot in the workshop.
4.2
WLAN access point
VCM can act as a WLAN access point for passengers in the car.
User interface needs to be implemented in an external unit, e.g. in a head unit with display. The
WLAN access point functionality is controlled via IHU Ethernet interface.
4.3
Data gateway
VCM acts as a data gateway for the WLAN access point and other ECUs in the vehicle. It can e.g.
provide internet connectivity for the head unit.
The data gateway is controlled via the IHU Ethernet interface.
4.4
Positioning information
The product automatically outputs GNSS raw position data on the CAN bus.
The GNSS data is used by other ECUs in the vehicle, for instance the Navigation system.
