Help with Alarm I/O Wires

J

jzobel

n3wb
Nov 16, 2021
29
6
NY
I have the SD49225XA-HNR PTZ. I am trying to work the the alarm I/O wires to trip a door bell sensor during motion as I am at an off grid location and not using BI. This model has 5 wires.
Alarm Out
Alarm Com
Alarm Ground
Alarm In 1
Alarm In 2

Using this doorbell
www.ebay.com

DC 12V Wired Doorbell Vocal Chime For Office Home Access Control A | eBay

Find many great new & used options and get the best deals for DC 12V Wired Doorbell Vocal Chime For Office Home Access Control A at the best online prices at eBay! Free shipping for many products!
www.ebay.com

I am confused as to why it has both Alarm Out and Alarm COM. The amperage of the chime is so low I doubt I need a relay. It has 4 wires. Looks like + and - , then simple contact switch wires. Is it correct to assume both the Out and COM wires have zero pass through voltage and should supply the chime its own power?

Should I use the Alarm Out and Ground. Or the Alarm COM and Ground?
 
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You want your ding-dong to activate during an event? The alarm IN/OUT are dry-contacts. Normally the alarm ground is for the input side, while the alarm common is for the output side. If you have an ohm-meter, better confirm, but the output could be “floating” to comply with your particular application. In your case, use the Alarm-Out and Alarm-COMM, connected between the green cable, an the other end to ground. You will need 12V constant (500mA is enough) at your ebay doorbell, while connecting the green cable to GND (-12V), in order to activate the ding-dong (no need for the yellow cable). Remember to login (WEB) for the alarm-setup event (normally open).
 
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Awesome. I never would have known not to use the alarm ground. One thing, if wiring the ding dong to 12v red and black. The green and yellow activate it when connected. So to be clear I don’t want to use alarm out and alarm com connected to yellow and green? And just red black to 12v source? I believe you entirely. But if the alarm out is a simple dry relay why doesn’t that setup work?
Thanks
 
I understand you need the constant 12V for power, while the Green is for triggering. Not sure about the yellow cable. I installed a similar bell at an office front desk, using only the green cable (plus power). It was a long time, but I could check my notes. If you have an ohm-meter, check for continuity between both cables. It could be at ground level (the yellow one)
 
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jzobel said:
Awesome. I never would have known not to use the alarm ground. One thing, if wiring the ding dong to 12v red and black. The green and yellow activate it when connected. So to be clear I don’t want to use alarm out and alarm com connected to yellow and green? And just red black to 12v source? I believe you entirely. But if the alarm out is a simple dry relay why doesn’t that setup work?
Thanks
Click to expand...

not sure if I answered your question in the above post. A drawing could help
 
eggsan said:
I understand you need the constant 12V for power, while the Green is for triggering. Not sure about the yellow cable. I installed a similar bell at an office front desk, using only the green cable (plus power). It was a long time, but I could check my notes. If you have an ohm-meter, check for continuity between both cables. It could be at ground level (the yellow one)
Click to expand...
FWIW, a similar ad in eBay shows constant 12VDC to red (+) and black (-) then push button "makes" green and yellow, as below:

s-l500 (1).jpg eBay-chime2.jpeg
 
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Yes...this is what I considered. Thank you. But I will have to test. Because your first version could also be right. As it appears they can sometimes be wired to have 2 switches. I guess front door & back door, haha. So effectively the green or the yellow may work the same, but just by using one or the other. I was so thrown off because most of the alarm out wires, look like the ones below.

DahuaWiki

dahuawiki.com dahuawiki.com

This arrangement had Alarm Out instead of Alarm NO, which I bet are the exact same.
 
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jzobel said:
Yes...this is what I considered. Thank you. But I will have to test. Because your first version could also be right. As it appears they can sometimes be wired to have 2 switches. I guess front door & back door, haha. So effectively the green or the yellow may work the same, but just by using one or the other. I was so thrown off because most of the alarm out wires, look like the ones below.

DahuaWiki

dahuawiki.com dahuawiki.com

This arrangement had Alarm Out instead of Alarm NO, which I bet are the exact same.
Click to expand...
For the record, it's @eggsan that has used the chime in the past; I'm just a meddler onlooker.:cool:
 
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TonyR said:
FWIW, a similar ad in eBay shows constant 12VDC to red (+) and black (-) then push button "makes" green and yellow, as below:

View attachment 164307 View attachment 164308
Click to expand...
Just check my notes. Yes, the yellow cable is at the same potential as the green, actually both at 0 volts (ground). It would be the same as bring the green cable to either yellow or green. TonyR is better suited for your application, in which you may used the camera 12v (if available), while using the yellow/green for contact (N.O.)
 
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jzobel said:
Yes...this is what I considered. Thank you. But I will have to test. Because your first version could also be right. As it appears they can sometimes be wired to have 2 switches. I guess front door & back door, haha. So effectively the green or the yellow may work the same, but just by using one or the other. I was so thrown off because most of the alarm out wires, look like the ones below.

DahuaWiki

dahuawiki.com dahuawiki.com

This arrangement had Alarm Out instead of Alarm NO, which I bet are the exact same.
Click to expand...
You may connect it either way. In my case, it was a matter of cabling availability (only three, power and trigger) at the end point
 
Gimmons said:
Some models have a different ring tone for the back door so you can tell where the visitor is. The green may give you a different tone from the yellow.
Click to expand...

jzobel particular doorbell is a single tone 12v ding-dong device. The yellow/green cables are only for triggering a single door. If you need to add a second door, a mechanical doorbell (16Vac transformer) could do the job.

 
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