CAN Wiring - A Practical Reference Guide
Common Mistakes to AVOID This drawing shows incorrect layouts. Understanding why they are wrong is as important as knowing the right way. Description: • Mistake A (Star Network): This is the most common installation error. You cannot simply branch the backbone out in multiple directions from a central point. Each branch would need terminators, resulting in too many on the network and causing signal chaos. • Mistake B (Excessive Drop Length): This drop cable exceeds the 6-meter maximum, which can cause signal reflections and data errors that are very difficult to diagnose. • Mistake C (Missing Terminator): Without a terminator at this end, signals will reflect back down the wire, corrupting all network data. *** MISTAKE A: Star / Multiple Backbones *** T----T--[120Ω Term] | | | [Device] | [120Ω Term]--T----T----X----T----T--[120Ω Term] <-- WRONG! More than 2 terminators. | | | | [Dev] [Dev] | [Device] | T----T--[120Ω Term] | | | [Device]
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*** MISTAKE B & C ***
[120Ω Term]--T----T-------------------T----T---- <-- **MISTAKE C: No Terminator!** | | | | | | | [Device] [Dev] [Power] |
| | | <-- **MISTAKE B: Drop > 6 meters.**
| | | [Device]
Right Angle Tee Pieces can be used to form a backbone when only 2-3 components spread apart
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