Led Indicator - 3onedata CAN485 User Manual

While CAN485 device connects with the CAN-Bus network via twisted pair, CANL connects with CANL, CANH
connects with CANH. According to the ISO11898 standard, to reduce signal reflections on the CAN-Bus and
enhance the reliability of communication, terminal matching resistor is usually added to 2 endpoints of the bus. The
size of terminal matching resistor is decided by the characteristic impedance of cable transmission, such as twisted
pair's characteristic impedance is 120Ω, the 2 endpoints on the bus should be connected 120Ω terminating resistor.
CAN485 can set external terminating resistor, when the device is connected with the CAN-Bus network via a
twisted pair, only use resistor to short circuit between the twisted pair ports RES+ and RES- to achieve terminal
resistor accession, as shown below.
When the CAN485 converter is used as the CAN-Bus network terminal, the two pin is connected to a resistance of
120Ω, otherwise no need to install a 120Ω resistor.
Serial port connection
RS-485 side is DB9 Male. The PIN definition is as follows:
DB9 Male
1 2 3 4 5
6 7 8 9

2.3 LED Indicator

LED indictor light on the top panel of product, the function of each LED is described in the table as below.
PIN
1
2
3
4
5
6/7/8/9
System statue LED
LED Indicate
ON
PWR
OFF
ON
CAN Flashing
OFF
ON
RS-485 Flashing
OFF
RS-485
D－ RS485－
D+ RS485+
— —
— —
GND Signal
— —
Description
Power is connected/Function natural
Power is disconnected or function
nu-natural
CAN-Bus port connect successfully
CAN-Bus port has data transmission
CAN-Bus port connect unsuccessfully
Serial port connect successfully
In transmitting/ receiving data
None data receive/ transmit
5
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