NI 9882 Operating Instructions
10
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Cable Specifications
Cables should meet the physical medium requirements specified
in ISO 11898, shown in Table 2. Belden cable (3084A) meets all
these requirements and should be suitable for most applications.
Termination Resistors
The termination resistors (R
t
) should match the nominal
impedance of the CAN cable and therefore comply with the values
in Table 3. The onboard, software-selectable termination has a
nominal value of 120
. If you are not using the onboard
termination, use the values listed in Table 3.
Table 2.
ISO 11898 Specifications for Characteristics of a CAN_H and
CAN_L Pair of Wires
Characteristic
Value
Impedance
95
minimum, 120
nominal, 140
maximum
Length-related
resistance
70 m
/m nominal
Specific line delay
5 ns/m nominal
