Termination Resistors
The termination resistors (Rt) 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 Ω. If you are not using the onboard
termination, use the values listed in Table 3.
Table 3.
Termination Resistor Specification
Characteristic
Value
Condition
Termination resistor, R
t
100 Ω min,
Minimum power dissipation:
220 mW
120 Ω nominal,
130 Ω max
Cable Lengths
The cabling characteristics and desired bit transmission rates
affect the allowable cable length. You can find detailed cable
12
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ni.com
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NI 9862 Getting Started Guide
