✔ Why Do You Need An End Of Line Resistor

Heres an analogy i like that illustrates why we need end of line terminations. Both the terminating resistor and the end of line resistor are across the conductors at the end of the circuit.

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The only purpose is to pass a small supervision current so the fire alarm or security panel can look at the wire.

Why do you need an end of line resistor. Theyre both at the end of the line and both across the conductors. When one person wants to talk they whip pulses down the rope towards their partner. The purpose of eolrs is to allow the control panel to supervise the field wiring for open or short circuit conditions.

To prevent this a resistor is installed at the end of the wire. If the supervision current stops the stoppage can be reported immediately and the trouble will be detected. A reflection on a transmission line occurs when impedance of the transmission line abruptly changes.

Simply remove a half inch of the white wires insulation attach one leg of the resistor to the white wire and tighten them snugly with a wire nut. The other person feels these pulses and figures out what the message means from them. How the alarm responds to each depends on the panel as well as system zone.

So if you put the resistor at the panel its again only going to supervise the wiring between the resistor and the panel which is now wiring. To allow the panels internal ohmmeter to check the continuity of the wires supervise the wires the end of line resistor is at the end of the loop. End of line resistors eolr are resistors of a specified value that are used to terminate protective loops or zones.

The end of line resistor is needed to prevent reflections. Fire before getting into the importance of the end of line resistor though we have to understand the importance of having a fire alarm system in the first place. End of line resistors for those systems are installed here.

End of line resistors eolr are resistors of a known value that are used to terminate protective loops or zones such as those found in esd or fg systems. A bus behaves like a rope held between two people. He purpose of eolrs is to allow the control panel to supervise the field wiring for open or short circuit conditions.

Then insert the other leg under the terminal screw for the no and tighten the screw. The end of line resistor is used to pass dc current. Because theres no ac there are no reflections from the end of the loop.

The purpose of eolrs is to allow the control panel to supervise the field wiring for open or short circuit conditions. The resistors need to go at the end of the line because they will only supervise the wiring from the resistor to the panel. The difference between the two types of resistor though is not where theyre at or even what theyre made out of.

How the alarm responds to each depends on the panel as well as system zone.