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National Instruments Corp.
11
NI 9882 Operating Instructions
Cable Lengths
The cabling characteristics and desired bit transmission rates affect
the allowable cable length. You can find detailed cable length
recommendations in the ISO 11898, CiA DS 102, and DeviceNet
specifications.
ISO 11898 specifies 40 m total cable length with a maximum
stub length of 0.3 m for a bit rate of 1 Mb/s. The ISO 11898
specification says that significantly longer cable lengths may be
allowed at lower bit rates, but you should analyze each node for
signal integrity problems.
Table 3.
Termination Resistor Specification
Characteristic
Value
Condition
Termination resistor, R
t
100
min,
120
nominal,
130
max
Minimum power
dissipation: 220 mW
