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Help with understanding schematics

C

cameo

Jan 1, 1970
0
I am trying to set up a digital input trigger for a D-Link DCS-2230 IP
camera and am not sure how to interpret the DI/DO schematics on page 58
of the following PDF manual:

<ftp://ftp.dlink.cz/dcs/dcs-2210/documentation/DCS-2210_man_revA_1-00_all_en_20110820.pdf>

According to the schematics, the digital input (DI) is to be applied to
pin 2 that has the note: "A switch from DI to DC 5 V, activated by
setting NO, or NC."

The type of DI (whether NO or NC) is set by the cam's software, as shown
on pg. 48 of the same manual.

Then on the bottom of pg. 58 there are two schematics for "Internal 5V
Power" and "External 3-12 V Power."

Could somebody just cut through the fog here and tell me what two pins I
need to connect to an external relay and whether that relay needs to do
just a close or open (based on the cam's NO/NC setting) or whether that
relays should actually apply some low voltage to the pins of the cam?
This schematics is a bit over my head, I'm afraid. Thanks.
 
D

DA

Jan 1, 1970
0
responding to
http://www.electrondepot.com/electrodesign/help-with-understanding-schematics-629210-.htm
DA wrote:

cameo wrote:

I am trying to set up a digital input trigger for a D-Link DCS-2230 IP
camera and am not sure how to interpret the DI/DO schematics on page 58
of the following PDF manual:
According to the schematics, the digital input (DI) is to be applied to
pin 2 that has the note: "A switch from DI to DC 5 V, activated by
setting NO, or NC."
The type of DI (whether NO or NC) is set by the cam's software, as
shown
on pg. 48 of the same manual.
Then on the bottom of pg. 58 there are two schematics for
"Internal 5V
Power" and "External 3-12 V Power."
Could somebody just cut through the fog here and tell me what two pins
I
need to connect to an external relay and whether that relay needs to do
just a close or open (based on the cam's NO/NC setting) or whether that
relays should actually apply some low voltage to the pins of the cam?
This schematics is a bit over my head, I'm afraid. Thanks.

Looks like your input is between pins 2 (DI) and 3(5VDC). The camera
itself supplies the 5VDC power (says the manual - I didn't use this
camera). So, your trigger device (reed switch for example) breaks the
circuit and the input goes low, that's how the camera knows it's tripped.

Things in security are usually NC (normally closed) for in case when the
evildoer du-jour rips the cable off and the trigger cannot close it
anymore but the destruction of the cable creates an open (naturally) by
itself and so the alarm gets tripped anyhow. Hopefully this is not a
battery-powered setup because NC circuits tend to draw some power (though
it can be very small).

Good luck!
 
C

cameo

Jan 1, 1970
0
Looks like your input is between pins 2 (DI) and 3(5VDC). The camera
itself supplies the 5VDC power (says the manual - I didn't use this
camera). So, your trigger device (reed switch for example) breaks the
circuit and the input goes low, that's how the camera knows it's tripped.

Things in security are usually NC (normally closed) for in case when the
evildoer du-jour rips the cable off and the trigger cannot close it
anymore but the destruction of the cable creates an open (naturally) by
itself and so the alarm gets tripped anyhow. Hopefully this is not a
battery-powered setup because NC circuits tend to draw some power (though
it can be very small).

Good luck!

Thanks. Actually, my trigger will be an X-10 actuator module that
provides a normally open trigger. What caused the biggest confusion for
me was the bottom right "External 3-12 V Power" schematics that seems to
duplicate the one on bottom left for "Internal 5V Power." The DCS-2230
camera does come with its own power supply, so I don't get what that
external power schematics is there for. Could it be for the DCS-2210
model that is essentially identical to DCS-2230 except it is wired-only,
using PoE. This manual is for both models though the differences are
usually pointed out in the manual. In this case there is no word about that.
 
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