What is an EOL resistor?
Simple definition
An end-of-line resistor is used by alarm panels and other monitored inputs to supervise circuit state.
Why it matters in wiring diagrams
The value and wiring method depend on the alarm panel programming.
When reading a wiring diagram, this term usually affects cable choice, power path, signal path, device selection or commissioning notes.
Common mistakes
- Assuming the term means the same thing across all brands.
- Ignoring the actual terminal names in the manufacturer manual.
- Not documenting how the term applies to the final installed system.