Low output voltage

[Knightrider]

I am trying to use one of the outputs to drive a 12v siren directly.  I have a 12v power supply, with 12v passing from the input to the 12v terminal on the output block.  If I connect my siren to the 12v and output terminal on the block, it doesn't sound properly, and if I measure the voltage across them with a multimeter I am only seeing ~10.5v.
Is this a limitation of the board, or have I wired something wrong?

[admin]

take a photo of your board , i want see how wire.

[twostar]

Just for comparison, I'm driving a 12V siren that way without any problems.  Having said that I haven't measured the output voltage so it may be running off less than 12V, a lot of alarm devices will run from a voltage range around 9-16V.

[Knightrider]

I don't have access to the panel right now, but will post a drawing of the wiring below:


If I measure the voltage between the output 12v terminal and output 1, when active it reads around 10.6V that doesn't seem to be enough for my siren.  If I measure across the 12v input itself (from the PSU), I get 12.6v.  If I connect the siren direct to the 12v PSU terminals, it sounds normally.

[admin]

your siren one wire connect with OUTPUT-1, another wire should connect to GND, NOT 12v power.

[twostar]

If I measure the voltage between the output 12v terminal and output 1, when active it reads around 10.6V that doesn't seem to be enough for my siren.  If I measure across the 12v input itself (from the PSU), I get 12.6v.  If I connect the siren direct to the 12v PSU terminals, it sounds normally.

The output ports switch the voltage on the rightmost connector onto the other connectors, so you're trying to switch 12V onto something that's already at 12V.  You need to connect one siren wire to the output, the other to GND.

[Knightrider]

Ah just me being stupid.  I already tried wiring the siren between the output and ground, and couldn't get it to work.  Turns out that the voltage input to the siren is polarity specific and I had the connection the wrong way round.  I also needed to invert the output.  Now all working correctly!  Thanks.