jumpjack 0 Posted July 20, 2010 Which sensors can I plug into this DVR? http://www.cn-dvr.com/manual/8204english.pdf Or, better, which are technical specifications of such sensors? Which V/I does the unit expect to see on its ports to get triggered? Share this post Link to post Share on other sites
Soundy 1 Posted July 20, 2010 Any dry-contact relay should do the trick. All the inputs are typically looking for is a change of state. By default it's probably set up for normally-open contacts - shorting between the two input pins would trigger it. You can probably configure it to look for normally-closed input as well. Share this post Link to post Share on other sites
jumpjack 0 Posted July 20, 2010 I thought this too, but any option I set ("high" or "low") for the inputs, connecting them to GND does not have any effect. That's why I'm asking if I have to apply some voltage. Share this post Link to post Share on other sites
cglaeser 0 Posted July 21, 2010 The manual mentions a setting for low-voltage and high-voltage. Perhaps there was an error in the translation and they meant something like 0V and +5V. Check the settings, and you might try pulling up with a resister. Best, Christopher Share this post Link to post Share on other sites
jumpjack 0 Posted July 21, 2010 I did additional tests: alarm is triggered if input is set to HIGH and connected to nothing; connecting it to GND stops the alarm. Share this post Link to post Share on other sites
cglaeser 0 Posted July 21, 2010 I did additional tests: alarm is triggered if input is set to HIGH and connected to nothing; connecting it to GND stops the alarm. Yes, that's what I would have expected after reading the manual. There is a setting that allows you to either pull up or pull down to trigger the alarm. Best, Christopher Share this post Link to post Share on other sites
