2.3Terminator resistor settings

In order to minimize reflection effects on the CAN bus line, the CAN bus lines have to be terminated at both ends by two terminal resistances. Based on the ISO 11898-2 spec, each terminal resistance is 120Ω (or between 108Ω~132Ω). The length related resistance should have 70 mΩ/m. Users should check the resistances of their CAN bus, before they install a new CAN network as figure 2-4.

Figure 2-4: Terminator resistor

Moreover, to minimize the voltage drop on long distance, the terminal resistance should be higher than the value defined in the ISO 11898-2. Table 2-4 may be used as a reference.

Table 2-4: Relation between bus cable and length

Bus

Bus Cable Parameters

Terminal

 

 

Length

Length Related

Cross Section

Resistance

(meter)

Resistance

(Ω)

(Type)

 

(mΩ/m)

 

 

 

 

0~40

70

0.25(23AWG)~

124 (0.1%)

0.34mm2(22AWG)

 

 

 

40~300

< 60

0.34(22AWG)~

127 (0.1%)

0.6mm2(20AWG)

 

 

 

300~600

< 40

0.5~0.6mm2

150~300

(20AWG)

 

 

 

600~1K

< 20

0.75~0.8mm2

150~300

(18AWG)

 

 

 

i-7540D CAN-Ethernet Gateway User’s Manual (Version 1.4, April/2008)

15

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ICP DAS USA I-7540D user manual Terminator resistor settings
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I-7540D specifications

The ICP DAS USA I-7540D is an advanced industrial field gateway designed to provide seamless communication between remote I/O devices and various industrial protocols. This device plays a crucial role in modern automation systems, enabling data acquisition and control over diverse industrial environments.

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