RTCU MX2 turbo Technical Manual V2.04
Logic IO ApS.
Ph: (+45) 7625 0210
Holmboes Allé 14
Fax: (+45) 7625 0211
8700 Horsens
Page 16 of 36
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Denmark
www.logicio.com
CAN
The RTCU MX2 turbo 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 like 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
1
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.
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, unit writing capability on the CAN bus is
disabled
and may be enabled by installing
hardware jumper JP901
2
inside the unit.
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
Description
3
CAN-H
CAN-bus H-signal
9
CAN-L
CAN-bus L-signal
8
SGND
Signal Ground
1 Assuming use of a CAT5 twisted pair cable
2 Please refer to appendix C regarding location.
