Why we use Resistors at the end of line on alarm security panels 

Man this video is golden for me. Apprentice fire alarm tech in commercial. And this just made things real clear for me. Thanks a lot

thank you for taking the time to show us ,,I will say thanks for all the thousands that watch your vids.

this is a very useful video, i was trained before and knew the why EOL resistor is a must, but just in theory, you experiment and explain more details and prove what i was trained and told is pretty right..

Thanks for showing why this is better. Now it will be easier to remember whenever I'm in doubt again.

I'm installing a new Alarm system in my house (Pima - Hunter PRO), and couldn't understand their explanation about the ELO resistor, till now :-). Thank you so much for helping me understand this issue.

I have two words for you.... Great video! the best explanation ive ever seen. Good job

still there are a wonderful peoples in this world.thanks man for your help.

Great video, explained it quickly and efficiently.

This was excellent. I'm putting the in now to upgrade my home wiring setup. Will ensure no issues.

Really helpful, easy to understand. Thanks for taking the time

Thanks so much for taking the time to make this video. Very helpful and informative.

Thanks, such a simple concept, but very effective. Well explained.

Very helpful and easy to understand. Thank you!

really appreciate the explanation. Very thorough and the demo helped solidify. thanks

Hello Thank you for the video i know it's a older one but it helped me a lot. I never know what the resistors are for. But i saw a lot of other videos of people adding resistors but never say what they are for. So again thank you.

This is very helpful. thank you!

thank you for this explanation!! i have asked why to most of the people i have worked with but no one ever could tell me why.

You are an excellent teacher...

Thanks for taking your time doing this video. This is my issue and I have no one to explain!! Thanks again

Love the explanation. I just use n/c loops. Especially now with wireless. If a wire is shorting out and I can’t use a different pair, sorry time to go wireless. Resistors are mostly used for supervision in commercial circuits where someone may try and tamper with wiring. But that’s more on the really big commercial side. Residential and small commercial we don’t use EOL. I hate EOL’s cause I find it harder to troubleshoot why a zone keeps false’ing. I work better with uninterrupted circuits. I totally understand why you would do this, but it just complicates things. Dealing with resistors at the panel is much more convenient.

Thanks, this was really useful!

Very good information. Thank you for sharing

Very useful! Thanks for this!!

Great clip. Thanks mate.

thanks for your effort sir. u such a nice guy!

thank you, explained it so much better than my textbook

thank you very much man..You are an excellent teacher... Salute..

thanks for the video, was very confused why there were a bunch of resistors at the control panel. Turns out whoever did the install years and years ago never watched this video!

I understood that perfectly. Thank you.

Thanks for the explanation. Great work brother.

Great video 👍

Thank you for sharing valuable information 💖

Excellent explanation.

Thank you very much for this video.

Great video helped me so much!

Brilliant explanation 👍

This video is GREAT, thank you so much

Thanks for a great video,

thanks, it's very helpful...

Awesome man. Thanks. Nice and clear

clear and concise, thank you

Great explanation...thank you very much

Very helpful, thanks.

very nice video now I can let my tech know why this is importent

Great video.

Simple and perfect explanation

This helped me thanks

thnks for the lesson bro 👍😁

If it were me, I would have the panel programmed for EOL resistor operation. The resistor offers the best of both worlds. Open and closed circuit operation. And, if you are an alarm hobbyist, the resistor is a must. You can tie resistors in series and do some cool stuff. The resistor is fun to play with in alarm systems. And, especially with fire zones...the trouble condition can be demonstrated to friends and stuff about what a trouble condition would look like on an alarm system. And, you can't do that without a resistor. And, especially if you have smoke detectors in your system, the trouble condition can be used as a reminder to put the smoke detector back. Especially me...everyone has done this, you've done this, I've done this. In fact, every time I do work in my house, I stand on a step ladder or a piano stool and twist off the smoke detector and drop it in a desk drawer and then put it right back when finished. Well, if you don't have the resistor, the trouble condition won't work and then, you could easily forget to put the smoke detector back. I would highly recommend keeping the resistor.

Thank you, your explanations are very clear and usefull for me, I have one question the movement detectors are wired like the smoke detector. (it has an open description). Thank you in advance.

Thank you for spending the time to make this. Clarified things for me alot.

Awesome video

Thanks for the explanation

brilliant very useful thank you

Thanks for explanation

Usually with just one resistor at the last sensor in the loop/furthest from the panel, but some systems (like the Vista series) allow for using double loops with two resistors on a single zone.

Glad it helped

Nice video thanks

awesome video. I'm an apprentice. you explain it so well and make it so easy. I really don't the theory work but after watching this the theory of it is not so daunting. thanks for your video

Thank you sir.

You can also use normal closed contacts and use 1 resistor in series with the contact and one parralel to the contact. For example if you use 3K3 resistors, in a normal non alarm state it will read 3K3, in alarm state it will read 6K6, when the conductor is cut it will read out off limit, and when it's shorted it's about 0 ohms. It's the standard way of working here. For fire detectors which are normally open we use the same method as you do.

nice explanation tnx

thank you very much man.. Salute..

thanks it was good to know

Please load more videos related to F & G system wiring.

Ok, I will wire it in series and see what happen. Thank you.

Very nice video

thanks much!!!

nice explanation

commercial we always use at device also unless doing some-kinda special bypass switch or something

Thanks!

Good evening. Can you incorporate a maglock into the alarm panel so that we have an intruder detection as well as an access control working togethee

Thank you

Great explanation as to why the resistor should be at the end of the line but it is a pity that magnet manufacturers make allowance for these in the magnet switch.

nice!

thanks explains alot.

That's a great demo! My only question is why they bothered to put the "eol" resistors in my control panel, where there's no difference between a closed switch and a short... Just a necessary current limiter?

Thanks for the video. I'm installing my own alarm system at my house. I'm all caught up in the thing about how people can fool the magnet switches, like the ones in your video. Can you recommend a good magnet switch for me? Much appreciated.

Glad i could help

First time i see it can cut or open a line just only pressing the cable with a plier....can you explain that? greets

Many sensors are wired in series on one zone, not sure how a control panel would need to be or could be programmed and wired to do resistors at each sensor for an in series closed circuit zone.

Hi, can you confirm on a smoke detector that the resistor goes across the positive and negative terminals. If so can I use the spare negative and positive terminals on the device itself?

Thanks. Been looking for an answer for the need for a resistor. My door contacts also have a resistor between terminals? Don't know why. Also, are resistors directional? Regards Phillip

O.k.....i have just bought a jet ski, i need to run a wire from my house alarm panel, about 10ft long to the jet ski, am going to loop a wire too and from the ski, i suppose i would (using two wires) run say my blue out to the ski, with my red, (the wires i use) and could just wire either end to a resistor to do the same job.....? it's only like running them to a magnet.....?.....yes...? and if that would be fine, what resitor would you recommend......thank you for your help.......

Basically what he's saying is by using a resistor at EOL you are supervising the entire wire and device which is the correct way of wiring a security device.

Find and dandy if you wire the building and service it. If youre just prewiring it and then its up to the home owner to decide on a monitoring service they would be lost, ive been there and it sucks.

This isn't only about preventing wiring trouble. If I was a burglar, hell bent on getting access to a building to steal something, I could theoretically get past the alarm if I really wanted to. Perhaps the building is open during the day, I could go inside and short out some window sensors. Or at night, cut or break the glass out of a window, reach through, and short the sensor. Then, you can open the window without setting off the alarm. With the end of line resistor, if somebody were to do this, as soon as you short the wire, the alarm would go off.

I have a nice little supervised (1.8 KOhm) four zone panel built in to a programmable keypad. I ran all my wiring to a closet behind the keypad and thru-walled the keypad feeds to my closet backbox. This mini-panel also has two supervised open inputs (emerg/fire) and a fixed/momentary contact output for aux out. I have two doors that must be individually zoned, that's zone one and two. I have eight windows, four on zone three and four on zone four. Each run was a homer AND each contact was supervised at the contact (1.8 KOhm resistor). Now, I've discovered a problem, as you can imagine. The panel wants to see 1.8K, the series-ed windows on each zone offer 7.2K of resistance which looks like a short to the panel. Do I have to remove three of the resistors on the window contacts so that the panel only sees one resistor? Or maybe, I should have divided by four and put .45KOhm resistors on each window, the combined offering 1.8K at the panel. As long as the zone threshold sees an open (drop of .45KOhm), this should work. Putting the windows in series (at the back box) won't work - do the math. Didn't USP have built-in resistored contacts at one time?

Very helpfull, thanks. Can you tell mi how to install more then one IC senzor on one alarm zone.

Same thing with commercial cameras now a days. I’ll run the wire, install the cameras and do all the connections. But don’t ask me to get it online. Cameras are usually all plug in play. But when they want to secure it all and get it working over a local and external network, that’s up to the IT guys.

Great

Good demo with the multimeter, but the explanation was kind of all over the place with the major point not made clearly. If you understand high school physics, easiest way to thing about EOL resistors is: they allow an alarm system to detect THREE states via a voltage read instead of two. The states are: 1) Open circuit - no current/voltage, 2) Normal close, with a reduced voltage due to the resistor and 3) Abnormal close, ie. a full short without the resistor being in-line. Of course, your alarm system needs to be able to measure these 3 states, but almost all have EOL resistor detection to do so.

Very nice explanation. Excuse me , What is written on Your Left Hand ?

It's really good to know this after all this time of wondering. But how come some times devices won't communicate properly without an EOL resistor? And how come some times you put them at both ends (start of line if that's such a thing, and end of line)

Brilliantly explained...you may of saved someone going to prison {:-) haha

Am I the last guy left who still services Morse MDC-16's!.....one of the best systems ever. And then there's the Optex-Morse Genysis POS!

Kraka, How many of these sets do you think i would need to run an RV refrig, say a 31" lcd, a small water pump and maybe a radio with some surround speakers?

So do you have a video how to wire eolr on fire strobe

buenas noches Seth McCaslin probaste con un tecte a ver si te miden los bornes 4 y 5 si es una honey well adenco tube un problema similar y era una resistencia..... pero diras luego a ver si te puedo ayudar si nos que sabes amas que yo.................

Great video. But how to get 4 contacts set(4 windows), in serial connection in 1 zone whit EOL. i use 4,7k2,2k now, in one contact.