Re : For the CAN instrument is the 120 ohm Resitor to be added by the customer

[TRWmem]

I am testing several CAN devices. The CAN communications has various resistance values.

R= 120 ohm

or 2600 ohm.

3300 ohms

The PXI-8464 CAN instrument will not read any frames until I installed a 120ohm resistor.

 I add a resistor to the 2600 ohms to reduce the circuit resistance to 120 ohms.

Then the resitance between CAN HI and CAN LO is 60 ohms.

Will this damage the PXI-8464?

[JB]

According to the ISO 11898 specification, for High-Speed CAN, you must use a cable with a nominal impedance of 120R and it must be terminated with a 120R resistor on both ends. So 60R, is not only supported by the interface but this is the expected load on the bus.

Some links :

NI-CAN User manual  --> Cable Termination, page 4-5

http://digital.ni.com/public.nsf/allkb/B5D65DF99543205486256FA500670B09

http://digital.ni.com/public.nsf/allkb/E64E8655D2B41DBA86256A530055E6BA