Can Communication Port - Logic IO RTCU LX2 pro Technical Manual

RTCU LX2 pro Technical Manual V1.00
Advanced Automotive M2M/IoT Gateway

CAN Communication Port

The RTCU provides the physical layer for the CAN (Controller Area Network) serial communication
interface in accordance with the ISO 11898 standard. The CAN bus is designed for high-speed (up to
1Mbit) robust communication in especially harsh environments like those found in the automotive
industry.
The CAN interface can be connected to an existing CAN network with a common protocol, such as
the J1939 standard, to retrieve information for surveillance or information purposes. The interface can
also be used as a robust serial data link with a non-standard protocol. Please consult the RTCU IDE
documentation for more information.
The physical layer consists of a two-wire (CAN-H and CAN-L) differential bus and a signal ground
for reference.
If the RTCU is connected to a "non-existing" network, a 120 ohm resistor must be connected between
CAN-H and CAN-L on each end of the transmission line in order to terminate it and avoid signal
reflections. This resistor can be connected on CAN bus 2 by activating configuration DIP-Switch 3,
which is located on the front-side, behind the front end-cap.
Be aware that connecting the RTCU to a CAN network can be dangerous. If the RTCU is not
configured with the correct network parameters, it will lead to network corruption and may interfere
with other connected equipment on the bus. Especially in vehicles, great precautions must be
observed to prevent communication interruptions.
By default, the write capability on the CAN bus is disabled. However, this can be enabled using
configuration DIP-switch 1 and 2 (located on the front, behind the end-cap) for the corresponding
CAN bus.
A wide range of software functions is available for easy access to the network. Please consult the
RTCU IDE documentation for further information.
X2: 12 pin COM connector overview
Pin Name
3 CAN1-H
9 CAN1-L
8 GND
X4: 6 pin COM connector overview
Pin Name
2 CAN2-H
3 CAN2-L
6 GND
Logic IO ApS.
Holmboes Allé 14
8700 Horsens
Denmark
Description
CAN-bus H-signal
CAN-bus L-signal
Signal Ground
Description
CAN-bus H-signal
CAN-bus L-signal
Signal Ground
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