The NetCamSC and NetCamSCD products use an opto-isolated input trigger, which is appropriate for POE devices. This type of trigger input requires a small voltage to be applied across the trigger inputs in order to activate the trigger. This is different from StarDot products which do not contain POE. In those designs, an internal resistor puts a ‘1’ signal on the trigger, and you can short circuit the trigger input to a ground on the same connector, to generate a ‘0’ signal. This was convenient for magnetic door switches.
The same is true in the SC products, except that short circuiting the inputs will not work. You must provide a voltage between 3.5 and 5.9V. An alarm signal can provide this voltage, or you can wire another voltage source for use with the door switch. For testing purposes it’s ok to use a 9V battery as is shown in the following picture, as long as you do not reverse the + and
