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SHENYANG GUANGCHENG TECHNOLOGY CO.,LTD.
USBCAN-II Pro
User Manual
Shenyang Guangcheng Technology CO.LTD.
3. Adapter in use
3.1 Connect to USB
USBCAN-II Pro adapter can conTable to the USB2.0 full speed protocol
specification, compatible USB1.1.
When driver and software have been installed, connect the adapter to the USB
interface, a new USBCAN device named "GC - Tech USBCAN Device" can be found
in the PC Device manager. If there is no
“
!
”
or
”
?
”
mark that the device run fine.
3.2 Connect to CAN
USBCAN-II Pro adapter connect to CAN-Bus as chapter 2.3, CAN_H to
CAN_H,CAN_L to CAN_L.
The CAN bus network adopts topological structure, only the two furthest
terminal need to connect 120
Ω
terminal resistance between CAN_H and CAN_L. For
branch connection, its length should not be more than 3m. CAN-bus nodes connection
as shown in figure 3.1
Figure 3.1 CAN-bus network
Note: the CAN-bus cable can use ordinary twisted-pair cable, shielded
twisted-pair cable. Theory of the maximum communication distance depends on
the bus baud rate, Their relationship as shown in the Table 3.1.
Baud rate
Distance
1 Mbit/s
40m
500 kbit/s
110m
250 kbit/s
240m
125 kbit/s
500m
50 kbit/s
1.3km
20 kbit/s
3.3km
10 kbit/s
6.6km
5 kbit/s
13km
Table 3.1 relationship of baud rate and distance
3.3 CAN-Bus terminal resistance
In order to improving the communication reliability and eliminating CAN-bus
