Vhandy Technology
GCAN-208 user manual
interference of CAN bus terminal signal reflection, the two farthest endpoints of the
CAN bus network usually need to add terminal matching resistors, as shown in Figure
3.2. The value of the terminal matching resistance is determined by the characteristic
impedance of the transmission cable. For example, the characteristic impedance of the
twisted pair is 120Ω, and the two end points on the bus should also be integrated with
120Ω terminal resistance. GCAN-206 module interface card uses 82C251 transceiver.
If other nodes on the network use different transceivers, the terminal resistance must
be calculated separately.
Figure 3.2 Connection of GCAN-208 module with other CAN node devices
3.5 System status indicator
GCAN-208 series modules have 1 POWER indicator light to indicate the power
supply of the system, 1 SYS indicator light to indicate the operating status of the
device, 1 Fiber indicator light to indicate optical fiber data transmission, 2 (or 1) )
CAN indicator light is used to indicate CAN bus data transmission. The specific
indication functions of these 5 indicators are shown in Table 3.3, and the meanings of
these 5 indicators in various states are shown in Table 3.4.
Indicator light
colour
Indicating status
POWER
green
System power supply indication
SYS
green
System operation instructions
Fiber
green
Optical fiber communication
instructions
CAN1
Red/green
CAN1 communication status
indication
CAN2
Red/green
CAN2 communication status
indication
Table 3.3 GCAN-208 series module indicators
After the GCAN-208 series modules are powered on, the system power supply lamp
POWER and the initialization status indicator SYS are on, indicating that the device
has been powered and the system is being initialized; otherwise, it indicates that the
system has a power failure or a serious error has occurred.
After the optical fiber and CAN are connected normally, when data is transmitted
between CAN and optical fiber, the corresponding Fiber and CAN indicator lights