M2M Control CX530 Technical Manual V1.00
Professional Automotive and industrial M2M/IoT Gateway
Page 15 of 36
CAN bus port
The CX530 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 M2M
CONTROL 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 CX530 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 by activating the software jumper in the
user application. Please consult the M2M CONTROL IDE document for the software jumper for a
detailed description.
Be aware that connecting the CX530 to a CAN network can be dangerous. If the CX530 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. This can be enabled by the jumper
located internal in the device. Please refer to Appendix D for the configuration details.
16 pin I/O connector overview.
Pin
Name
Description
6
CAN-H
CAN-bus H-signal
14
CAN-L
CAN-bus L-signal
5
GND
Signal Ground
