CANDTU-400ER
CAN Bus Message Recording and Wireless Data Transmission Equipment User Manual
©2021 Guangzhou ZLG Electronics Technology Co.,Ltd.
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User Manual
high-speed CAN, a 120 ohm terminal resistor needs to be connected to the network
terminal node to eliminate signal reflection on the bus and avoid signal distortion. Figure
3.2 shows the high-speed CAN network topology.
The device has a built-in 120 ohm terminal resistance, which can be configured to
turn on or off by using the configuration tool CANDTU. For operation details, see 4.3.1.
Note: The bus communication distance and communication rate are related to the
field application and can be designed according to the actual application and related
standards. The CAN-Bus cable can use ordinary twisted pair, shielded twisted pair or
standard bus communication cable. In long-distance communication, the terminal
resistance value needs to be selected according to the communication distance, cable
impedance and number of nodes.
3.6 Ethernet Interface
The device provides one Ethernet interface. The physical form of the interface is RJ45, which realizes the
communication between the device and the PC. The interface 100/1000M specification, interface
schematic diagram and signal definition are shown in Table 3.9.
Table 3.9 Ethernet interface
Type
Schematic Diagram
RJ45 terminal
3.7 SD Card Interface
The device provides one SD card interface, which supports a maximum of 64 GB SD
memory card for storing CAN bus message data. The interface adopts a self-locking card
slot, and the SD card can be locked after the card is inserted according to the direction of
the casing logo to prevent accidental falling off during use. When pulling out the card, just
push it inwards to eject the SD card.
The SD card uses the EXT4 file system. Connecting the SD card through a card
reader cannot directly view the SD card data in the Windows system. You need to install a
tool plug-in that supports the EXT file system (for example, Ext2Fsd).
The device data can be obtained directly in the window by using the method in
section 4.3.5.
Note: Do not forcibly pull out the card during the device operation; otherwise, it
may cause data loss or damage to the memory card and device exceptions!
If
necessary, after powering off the device, open the SD card slot cover, push in
gently and eject the SD card.
