Kvaser PCI104 User's Guide
12(17)
Kvaser AB, Mölndal, Sweden — www.kvaser.com
Table 2. Functions of the pins in the IDC Male Header CAN connector.
IDC header pin number
Function
1
Not connected.
2
Not connected.
3
CAN_L
4
CAN_H
5
GND
6
Not connected.
7
Not connected.
8
Not connected.
9
Inner Shield, read chapter 3.5
10
Outer Shield, read chapter 3.5
4.7 CAN Bus Termination
There are no on board CAN bus terminators on the PCI104 board. You must terminate the
CAN bus yourself by placing a 120 Ohms resistor between CAN_H and CAN_L at each end
of the CAN bus.
Note that without terminators on the CAN bus, the communication may or may not work
– it’s
totally unpredictable. For laboratory use the termination need not be perfect but you will
always need some load resistance between CAN_H and CAN_L somewhere on the CAN bus.
4.8 LED Indicators
The on board LEDs indicate the status of the card according to Table 3
. For the LED’s
position on the board, see Figure 1.
Table 3. Meaning of the LED activity on the PCI104 boards.
LED Activity
Meaning of LED Activity
Both LEDs are blinking continuously with a
frequency of around 5 Hz
The built-in self-test failed.
Steady light
The card is OK.
Blinking irregularly
The card is OK, and there is activity (transmit
or receive) on the CAN bus.
4.9 Motherboard Power Supply
The PCI standard mandates that if a PCI connector on the computer motherboard provides
5 V, it must also provide 3.3 V. However, not all computers follow the standard here. If your
Kvaser PCI104 board is not responding after installation, it could be a good idea to check the
computer documentation if the PCI slots really are compliant to the PCI standard.
