National Instruments PXI-846x 用户手册
Appendix C
Cabling Requirements for PXI-8461 High-Speed CAN
C-2
ni.com
The 5-pin Combicon-style pluggable screw terminal follows the pinout
required by the DeviceNet Specification. Figure C-2 shows the pinout for
this connector.
required by the DeviceNet Specification. Figure C-2 shows the pinout for
this connector.
Figure C-2. Pinout for 5-Pin Combicon-Style Pluggable Screw Terminal
CAN_H and CAN_L are signal lines that carry the data on the CAN
network. These signals should be connected using twisted-pair cable.
network. These signals should be connected using twisted-pair cable.
The V+ and V– pins are used to supply bus power to the CAN physical
layer if external power is required for the CAN physical layer. If internal
power for the CAN physical layer is used, the V– pin serves as the reference
ground for CAN_H and CAN_L. See the next section, Power Supply
Information for the High-Speed CAN Ports, for more information.
layer if external power is required for the CAN physical layer. If internal
power for the CAN physical layer is used, the V– pin serves as the reference
ground for CAN_H and CAN_L. See the next section, Power Supply
Information for the High-Speed CAN Ports, for more information.
Power Supply Information for the High-Speed CAN Ports
For the PXI-8461, a jumper controls the source of power for the CAN
physical layer. For the one-port boards and port one of the two-port boards,
power is configured with jumper J5. For port two of the two-port boards,
power is configured with jumper J6. The location of these jumpers is shown
in Figure C-3.
physical layer. For the one-port boards and port one of the two-port boards,
power is configured with jumper J5. For port two of the two-port boards,
power is configured with jumper J6. The location of these jumpers is shown
in Figure C-3.
CAN_L
V
–
CAN_H
V+
Shield
1
2
3
4
5