Revo2Maxx wrote: ↑Mon Jan 20, 2025 1:27 am
Well from what the Picture you show the Relay being 5v so you would need a 5v relay that would be on a break out board, converted to NC. SO the pins going to the NVR PCB would be the NC from the relay.. But could just desolder and make that with the Relay you already own.
External relay easier to have 12v relay yes. But there are 5v power supplies around. There are a lot of things you can do. I mean if you are going to use 12v might as well do an External 12v relay so your 2 wires go to relay and then the relay once trigged then sends the 12v to your device.. Now I wish I would have bought the POE Version. I mean I have the first 42xx gen both of them are NO like my first gen 5232... must be a reason they went 1 NO and one NC.
Man I think you may be tired! I'm needing to convert NC to NO. Unless I'm misunderstanding you...Yeah though I'm partial to going external and my devices all need 12v.
As for a reason why, I mentioned one potential reason say the end user has a 4k ultra hd cam with facial recognition at an electric front gate. The NC relay is holding the gate closed with voltage and when the face is recognized in the database it triggers an event and Alarm 2 is activated releasing the gate.
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You mentioned before a BOSCH Relay. Can you give a diagram of wiring out from it. I found this and it would be beneficial to have one like that with the socket for easier wiring. https://www.amazon.com/Automotive-Chang ... 209&sr=8-3
Revo2Maxx wrote: ↑Tue Oct 15, 2024 4:20 pm
About the Relays, I don't know this Ebay listing owner and was just picked at random. But this is a 5 pin Bosch type relay that had a Diagram on the side for what the pins do. https://www.ebay.com/itm/166042621706?_ ... R97Rg6LSZA
About relay wiring diagram There is many different ways to connect a Relay. In a 5 pin 87a is at rest in connection with 30. and what this means is anything that is at pin 30 lets say your 12v high current it will power the other side of 87a. When 85 and 86 pins trigger in this case off the output from the NVR it will move the Switch to 87 and power what ever is connected to the other end of that like a high power 12v light. If there is no need for a center pin relay you can get a 4 pin relay and then there is no 87a and only thing that will happen is when 85 and 86 trigger it will connect 87 to pin 30..
So pins
Pin 30 12v + high current
Pin 87a Output to maybe a 12v Led at Monitor station as a This is ready (If that light is off then output has triggered or fault in wiring)
Pin 87 This is Output to High power alarm or light
Pin 86 12v+ from smaller output like 300ma
Pin 85 Ground.
So why I said it can be wired different is because the Ground from the NVR could be what triggers the relay at pin 85 or if there is a 12v but low current switch then that + would be the trigger point and the ground would be constant on the relay. However if the Relay is just passing a ground then the 12v at pin 86 would be constant and the Ground pin 85 would trigger the relay..
Next in some cases 85 and 86 can be wired either way. Keep in mind however there are some relays out there that do infact have a built in diode for spike suppression and then the wiring to the pins need to go with the ground to the right pin. When you look at the side of the relay for a diagram normally it would show a connected area between 85 and 86 with the line in the direction of ground normally Pin85 so even ones without the Diode I always use 85 for ground Normally. There are some cases for wiring ease that I don't on relays without the diode. In some cases when there is no diode in a Relay I would install my own again to suppress the voltage spike that might happen when the coil of the relay de-energizes. Not always used or needed but good idea.
I always use my ground wire and my latching led push buttons on my keystone wall plate are metal so it would be better to use the ground like on my NO1 and C for alarm 1 I used ground so that when the relay is triggered it latches connecting the 2 ground wires and completes the circuit thus activating my siren. So:
Pin 85: Ground input
Pin 30? Pin 86? 12v input?
Pin 87a: trigger wire?
IF I'm understaind you correctly? Keeping in mind the wiring socket color coding may be off but a pair of electronic tweezers may be able to remove them and color code them correctly. I'm not sure though that the BOSCH relay you posted is a changeover relay. Chances are the one I'm looking at the Red and Yellow are going to be V+ with the black GND and the others trigger wires. The wiring harness would make this a plus because you could screw the relay into the wall over the NVR and if the relay ever did burn out...just unscrew it and pull it from the socket and replace.
I think I'm getting the general idea of this though and noting that the wiring is likely different because it IS a changeover relay. So rather than going by the pinout you mentioned if I got this one from amazon I'd go by the wire color coding.
IF this goes by color coding for the non Bosch changeover relay from amazon and my assessment is correct that the yellow is also 12v. This would have to be tested and prob better if I actually had it to hook up to my shop power supply and a multi tester. I'm saying this because all of this can easily mass confuse....the changeover relay it should not matter whether you are connecting it to an NC or NO relay....it will change it opposite from what I'm gathering.
I am working in circles around myself. IF this does not work check your wiring for shorts. This was my case and when I connected a different 12v dc 5mm barrel connector extension to my load it instantly worked! This post should probably be pinned or something to this thread so it doesn't confuse others.YOU DO NOT NEED A PHOTO SENSOR RELAY OR ANYTHING ELSE OTHER THAN THIS EXTERNAL RELAY OR A SINGLE CHANNEL ONE IF YOU HAVE ALARM 2 AS AN NC RELAY. TEST IT FIRST BY CONNECTING A MULTI TESTER (-) to CTRL and (+) to P AND TRIGGER AN EVENT ON THE NVR MANUALLY. IF THE MULTI TESTER IS SET TO CONTINUITY YOU SHOULD HEAR A BEEP NORMALLY AND WHEN THE ALARM 2 IS TRIGGERED IT WILL STOP BEEPING. IF THAT APPLIED IT'S AN NC RELAY. OTHERWISE IT WILL NOT BEEP UNTIL YOU TRIGGER AN EVENT.
Don't get the dual channel. You can't use it in the same manner as an alarm block that has 2 NO relays.
ABOVE DIAGRAM IS TESTED AND 100% WORKING FLAWLESS ON MY NV4232E-EI NVR.
The key reason why you can't use a dual channel with an alarm block like this is because you'd be connecting Alarm 1 and Alarm 2 together (Note CTRL)
and question your ground on Alarm 1.
As for my photo sensor relay wiring diagram, you could study it and use it as a trip wire of sorts to trigger an alarm in event provided that you do not heat up the heat shrink tube holding the led and sensor together.
Don't get me wrong you could use it instead of the above relay mentioned but you don't want to be sound asleep and awoken at 3 am to a blaring siren because the led simply died. Unless you have something else to add Rev I'm requesting the Moderators lock this thread.
