Is CAN Breakout Box supposed to create a bus?

I have a CAN Breakout Box that was intended to simplify connecting multiple CAN nodes on a bus. I am currently using High Speed CAN cables with a total of five nodes (two ECUs, one Sniffer and two connected to a PXI chassis) at 250kbaud. I'm seeing lots of frame errors on the bus, only when the Breakout Box is connected, and it seems to be an issue with the termination resistance.
Generally I utilize a standard bus configuration wired using twisted pair cable with 120Ohm resistance on either end of the bus and stubs for each node. I'm wondering if the Breakout Box can be configured as a bus with termination resistance on both ends, similar to a standard bus. It seems that it's configured as a bus with only termination resitance on one end, so I'm wondering if this is the source of my error frames, and if I need to complete the bus by placing another external terminating resistor on the other end?

The wording in this KnowledgeBase article implies there is only one resistance in the break out box so I think you may be right. I would try adding an additional terminating resistor and see if that helps.
Jeff L
National Instruments

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Hi,
I am relatively new to the CAN networks and i am having some difficulties understanding some basic concepts and i would be grateful if someone can help me out.
so my questions are as follows:
what's the use of the CAN breakout box apart from providing external power?
i am working with the following equipments
NI - 9862 and NI cDAQ-9174 chassis.
I would like to know what model of CAN controler is present in the NI 9862 module and where is the microcontroler found, in the Ni 9862 module or Chassis?
Thanking you in advance.
Regards
Bonjour,
je suis nouveau en ce qui concerne le réseau CAN et j'ai du mal à comprendre des petits chose. Je veux savoir quel modèle de controleur CAN est présent dans le NI-9862?
où se trouve le microcontroleur dans le chassis ou le module ni-9862?
est-ce que je peut connecter 2 modules NI 9862 directement sans passer par le boitier d'extension?
Cordialement.

As much as I'd love to help you out I think you'll have more luck over here http://forums.ni.com/t5/Automotive-and-Embedded-Networks/bd-p/30
This forum is for NI TestStand. The experts for CAN are in the other forum.
Good luck,
jigg
CTA, CLA
teststandhelp.com
~Will work for kudos and/or BBQ~

Why do we use can breakout box?

Hi,
I am relatively new to the CAN networks and i am having some difficulties understanding some basic concepts and i would be grateful if someone can help me out.
so my questions are as follows:
what's the use of the CAN breakout box apart from providing external power?
i am working with the following equipments
NI - 9862 and NI cDAQ-9174 chassis.
I would like to know what model of CAN controler is present in the NI 9862 module and where is the microcontroler found, in the Ni 9862 module or Chassis?
Thanking you in advance.
Regards
Bonjour,
je suis nouveau en ce qui concerne le réseau CAN et j'ai du mal à comprendre des petits chose. Je veux savoir quel modèle de controleur CAN est présent dans le NI-9862?
où se trouve le microcontroleur dans le chassis ou le module ni-9862?
est-ce que je peut connecter 2 modules NI 9862 directement sans passer par le boitier d'extension?
Cordialement

Here is the data sheet for the 9862.
http://www.ni.com/datasheet/pdf/en/ds-97
The 9862 includes everything except the chassis. A USB or Ethernet based cDAQ chassis is all you'll need to read and write CAN using the XNET library which I'm a big fan of. Or if you are wanting to go the embedded design you'll want a cRIO chassis, or one of the chassis with an embedded PC which can run head-less. These get a lot more expensive and you'll want to make sure the chassis is compatible with the 9862 some of the older ones are not.
Unofficial Forum Rules and Guidelines - Hooovahh - LabVIEW Overlord
If 10 out of 10 experts in any field say something is bad, you should probably take their opinion seriously.

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returntoredgary wrote:
Which is the best breakout box to use?
Any ideas appreciated.
Cheers
Gary
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Is CAN Breakout Box supposed to create a bus?

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