CANDTU-100UR
CAN Bus Message Recording and Wireless Data Transmission Equipment User Manual
©2021 Guangzhou ZLG Electronics Technology Co.,Ltd.
8
User Manual
Table 3.5 Flange terminal signal definition
Function
interface
Signal
definition
Signal description
CAN
CAN_L
CAN data transceiving
differential inverted signal
CAN_GND
CAN isolated ground
CAN_H
CAN data sending and
receiving differential positive
phase signal
CAN_SHIELD
CAN shield ground
Table 3.6 CAN-Bus interface specifications
Parameter
Minimum
Typical
Value
Maximum
Unit
Communication baud rate
5k
1M
bps
Number of nodes
110
pcs
Dominant level (logic 0)
CANH
2.75
3.5
4.5
V
CANL
0.5
1.5
2
Recessive level (logic 1)
CANH
2
2.5
3
CANL
2
2.5
3
Differential level
Dominant (logic 0)
1.2
2
3.1
Recessive (logic 1)
-0.5
0
0.05
Maximum withstand
voltage of the bus pin
-18
18
Instantaneous voltage of
the bus
-100
+100
Isolation voltage (DC)
3500
V
Figure 3.4 Typical high-speed CAN network connection
The CAN bus adopts balanced transmission. ISO11898-2 stipulates: In the
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
3.4 shows the high-speed CAN network topology.
The device has a built-in 120 ohm terminal resistance, which can be configured to
