H
homecctv
im into cctv in a big way, and now want to expand with sensors and relays etc.
never used a relay before but I understand its simply a switch.
bought my first relay, a 12v activated one, wired a table lamp to the relay, applied a 12v voltage and it worked, turned off the 12v supply and light went off - understood and was simple to learn about
now using relays with alarms etc.
1. I understand a redwall pir cant be used with my above relay to turn my table lamp on - but why?
2. have I got to wire the pir to my cctv drv, then use a out put to trigger a relay to activate my 240 table lamp?
3. will my dvr be outputting 12v to trigger the relay?
4. what is dry contacts? +ve -ve ? volt free?
5. I have texecom alarm, gjd lighting system, and loads of redwalls.
I just want to be able to understand what relays to use and the anserws to question 4?
all my items have different outputs and inputs, all using different triggers and its so confusing as I never studies electronincs.
can some one help me and understand all these triggers and relays etc?
I no im asking a lot but im a quick leaner, I have ptz domes etc etc and I installed them no bother what so ever, so im not a total novice, I just want to be able to understand so I can link cctv to redalls, to my texecom panel and to my gjd system - its these dam relays and triggers that's confusing me!!
never used a relay before but I understand its simply a switch.
bought my first relay, a 12v activated one, wired a table lamp to the relay, applied a 12v voltage and it worked, turned off the 12v supply and light went off - understood and was simple to learn about
now using relays with alarms etc.
1. I understand a redwall pir cant be used with my above relay to turn my table lamp on - but why?
2. have I got to wire the pir to my cctv drv, then use a out put to trigger a relay to activate my 240 table lamp?
3. will my dvr be outputting 12v to trigger the relay?
4. what is dry contacts? +ve -ve ? volt free?
5. I have texecom alarm, gjd lighting system, and loads of redwalls.
I just want to be able to understand what relays to use and the anserws to question 4?
all my items have different outputs and inputs, all using different triggers and its so confusing as I never studies electronincs.
can some one help me and understand all these triggers and relays etc?
I no im asking a lot but im a quick leaner, I have ptz domes etc etc and I installed them no bother what so ever, so im not a total novice, I just want to be able to understand so I can link cctv to redalls, to my texecom panel and to my gjd system - its these dam relays and triggers that's confusing me!!