Hello,
I am looking to have a 12V trigger input. I am trying to find info online about a 12V trigger specification but it seems that different manufacturers do different things.
Anyway, my question is:
Is 12V trigger typically 12V for on and open circuit (high impedance) for off
or
12V on and 0V (driven to 0V) for off?
Thanks;
Leo
I am looking to have a 12V trigger input. I am trying to find info online about a 12V trigger specification but it seems that different manufacturers do different things.
Anyway, my question is:
Is 12V trigger typically 12V for on and open circuit (high impedance) for off
or
12V on and 0V (driven to 0V) for off?
Thanks;
Leo
As a matter of interest, consider the basic; send 12volts to a unit, that turns a relay on and starts it. Nothing easier than sending a voltage. There is not a standard, just enough voltage to switch it on or not enough and it switches off. Either a relay coil or a Cmos 4013 switch will suffice.
Now, if the 12volts is within the unit and a switch externally is used, that could switch a relay or the voltage could be detected if a selection of resistive loads were used. 12volts is a handy voltage to use. You could say no load to the 12volts means no relay coil activated.
Early wired 'remote', controls used a simple voltage between 0 and 10volts (for instance of easy description).
0 was all of, and 5volts was control 1 signal, 10volts was control 2 signal. The receiver noted the 0, 5 and 10volts and switched in circuits accordingly. An early form of A - D you could say. (See old JVC video recorders for more information).
So, with that in mind, consider a remote control set up to send as many signal sequences as required with the receiver built into the unit . There is no limit nor specification until you use the coding systems for I/R remote handsets described by Philips or other manufacturers.
I hope that answers a question and sheds more light on a very old subject.
Now, if the 12volts is within the unit and a switch externally is used, that could switch a relay or the voltage could be detected if a selection of resistive loads were used. 12volts is a handy voltage to use. You could say no load to the 12volts means no relay coil activated.
Early wired 'remote', controls used a simple voltage between 0 and 10volts (for instance of easy description).
0 was all of, and 5volts was control 1 signal, 10volts was control 2 signal. The receiver noted the 0, 5 and 10volts and switched in circuits accordingly. An early form of A - D you could say. (See old JVC video recorders for more information).
So, with that in mind, consider a remote control set up to send as many signal sequences as required with the receiver built into the unit . There is no limit nor specification until you use the coding systems for I/R remote handsets described by Philips or other manufacturers.
I hope that answers a question and sheds more light on a very old subject.
In the scenario that you are describing 12V turns on and an open circuit turns off.
Do I understand that correctly?
Do I understand that correctly?
Correct, open circuit means no current flow which means the relay will not be activated. Complete the circuit and the relay will pull in.