Is It Necessary to Connect VSup to NI 8473 Even Though It Is USB Powered?

Updated Jul 15, 2019

Reported In

Hardware

  • USB-8473
  • CAN Cable
  • CAN Interface Device

Issue Details

From standard D-sub cable the pin number 2 & 7 are the CAN Low & CAN High for the communication. Pin number 3 and 9 are V+ and V-. The USB- 8473 is USB powered, Hence the understanding is that it will take the power from the computer. It is necessary to connect vehicle battery 12Volts ( +ve and –ve) to pin number 3 and 9 ?

Solution

V+ supplies bus power to the CAN physical layer if external power is required. All High-Speed Series 2 PCI, PXI, and USB hardware is powered internally, so it is not necessary to supply V+.

Refer to USB CAN topic in this manual for complete understanding of the pin diagram and necessary connections.

Following is the information for various NI-XNET/CAN devices:
Device SeriesHigh-Speed (HS)Low Speed (LS)Single Wire (SW)Software Selectable (XS)
NI-XNET Devices
PCIInternal (PCI-8512)Internal (PCI-8511)External 
8-18V (PCI-8513)
Mode Dependent
(PCI-8513)
PXIInternal (PXI-8512)Internal (PXI-8511)External
8-18V (PXI-8513)
Mode Dependent
(PXI-8513)
USBInternal (USB-8502)------
C SeriesExternal
9-30V (NI 9862)
External
9-30V (NI 9861)
----
Transceiver CablesInternal
(TRC-8542/8543)
External
9-30V (TRC-8543)
----
NI-CAN Devices
PCI-CANInternal
(PCI-CAN)
Internal
(PCI-CAN/LS)
External
9-18V (PCI-CAN/SW)
Mode Dependent
(PCI-CAN/XS)
PCMCIA-CANInternal
(PCMCIA-CAN)
Internal
(PCMCIA-CAN/LS)
External
8-18V
--
PXI-846xInternal
(PXI-8461)
Internal
(PXI-8460)
External
8-18V (PXI-8463)
Mode Dependent
(PXI-8464)
USB-CANInternal
(USB-8473)
Internal
(USB-8472)
----
NI-RIO Devices
NI-RIOPort 0: Internal (NI 9853)Port 0: External 8-36V (NI 9852)----
Port 1: External 8-25V (NI 9853)Port 1: External 8-36V (NI 9852)

 

WAS THIS ARTICLE HELPFUL?

Not Helpful