NI 9861 Operating Instructions
10
ni.com
port. NXP recommends an overall RTH and RTL termination of
100 to 500
Ω
(each) for a properly terminated low-speed network.
Termination on the low-speed/fault-tolerant port of the NI 9861 is
set through the NI-XNET software to either 1 k
Ω
or 5 k
Ω
.
Cable Lengths
ISO 11898-3 (Low-Speed/Fault Tolerant) defines data rates up to
125 kbits/s with the maximum bus length depending on the data
rate used and the busload. To provide a maximum communication
speed of 125 kbits/s, the overall network length should not exceed
40 m. However, you can increase the overall network length by
reducing the actual communication speed. Detailed cable length
recommendations are in the ISO 11898-3 specifications.
Number of CAN Nodes
The maximum number of nodes depends on the electrical
characteristics of the nodes on the network. If all of the nodes
meet the requirements of Low-Speed/Fault-Tolerant CAN, up to
32 nodes may be connected to the bus.