NV4232E-16P-EI Alarm Block Pinout

[katienelson71753]

Questioning my logic on this now that I have somewhat of a better understanding of what's happening with the relay. Ok N1 and C1 on the alarm block is like a light switch....?unless voltage is added? it is a Normally Open (NO) zero volt circuit. Now if the circuit is closed ?unless voltage is added? it is still a zero volt circuit. I'm looking at the IN on the $5 relay. It can be low zero volt or high 12v.... The IN is the trigger....

[katienelson71753]

or would this be correct?

[katienelson71753]

Makes sense...correct me if I'm wrong but this should work

It's easier to make sense of it all if we think of NO1 as Normally Open Circuit 1 and C1 as Circuit 1

[katienelson71753]

Little tired but questioning Alarm 2:
I can confirm P and GND will give 12v.
If I'm correct setting the external relay to LOW signal when Alarm 2 is triggered which is Normally Closed it will drop the voltage to 0 and switch the relay input 12v to NC on the output side of the external relay.

[katienelson71753]

Some times basic math doesn't apply the same way in electronics. Because I'm getting older it doesn't matter what I've learned. Did I leave the clothes in the washing machine. I go back and check.

So what I did was plug in a 12v 1amp wall adapter and plugged a female 12v barrel pig tail onto the end of it. I connected the negative and positive wires coming off the pig tail to a black and red wire and connected them to my scientific power supply set for 12v 1 amp. I measured at the wire twist for voltage with a multi tester.

It did not make it 24v it remained 12v. What's happening and the concept that slipped by my tired 4 hrs sleep for 3 days mind...is that it's increasing available amperage or current but the voltage remains the same.

I mean no offense but these guys are Chinese translating stuff to English. My hunch is they simply forgot to say - 12v in their description. They said + 12v for P though.

[katienelson71753]

No1 and C1 = Alarm 1

CTRL and P = Alarm 2

What happens if you take a multi tester that's capable and touch both leads to a piece of copper wire with the tester set on conductivity.....you will get a beep.

So what I did was connect a black wire to CTRL and a red wire to P and connected my probes to them. When I switch the multi tester on beeeeeep now when I use DMSS android app and click

Alarm 2 [ Manual ]

It stops beeping. This is because it is a Normally Closed Circuit. (NC)

This does confirm that the device has an Alarm 2 output though.

When I wire this as depicted in my illustration, I'm noticing the 12v 1 amp wall power supply's green led goes out but when I click [ Manual ] in the DMSS android app it turns back solid green and the mutli tester reads 12v.

Should I be concerned about that green led going out!!!???? I'm racking my brain trying to figure out what's exactly happening with that otherwise it works as desired!!

?over current protection on the 12v 1 amp wall supply??? ?? short circuit protection??

[katienelson71753]

Should I be concerned about that green led going out!!!???? I'm racking my brain trying to figure out what's exactly happening with that otherwise it works as desired!!

?over current protection on the 12v 1 amp wall supply??? ?? short circuit protection??

Looking at the relay....
I'm looking harder at the possibility of it being the wall unit's short circuit protection...

From the Wall unit's (+) ---> <--- to the NVR's alarm block P (+) 12v
Questioning a zener diode or something to in between to prevent the +12v to flow backwards into the wall unit

[katienelson71753]

Yes, a Zener diode can be used to prevent voltage from moving backwards in a line:

How it works
A Zener diode is a semiconductor diode that's designed to operate in reverse bias. When a reverse voltage is applied to a Zener diode that's equal to or greater than its Zener voltage, the diode allows a sudden increase in current to flow through it while the voltage across it remains constant.

Applications
Zener diodes are often used to protect circuits from overvoltage conditions. They can also be used to generate a stabilized voltage, or to clamp undesired over-voltages to protect MOSFETs.
Comparison to standard diodes
A Zener diode is similar to a standard diode, but it's designed to have a low and specified reverse breakdown voltage. A standard diode will block the reverse flow of current, but it can break down or become damaged if the reverse voltage is too high.

--------> <--------- ?short circuit protection causing the green led on wall unit to go out?

[katienelson71753]

This I think would be the correct wiring:
That prevents the NVR "P" 's 12v (+) from back feeding into the wall unit

[katienelson71753]

Looked on the back of the wall unit:
XVE AC/DC Adapter model XVE13D-1260100-2
Green led = Charged OK
Red led = Charging

When I wired as depicted in normal untriggered mode it lightly flickers red and reads 0v on multi tester.
When I click [ Manual ] it turns green and reads 12v on multi tester.

Best I can tell this is 100% working and should be safe. So you need a 12v zener diode and a 12v 1 amp wall unit power supply.
Then you can use Alarm 2 output in the same manner as Alarm 1.