54
- +
Relay
-
+
-
+
Alarm device
(e.g. siren)
+
-
3-4 V battery
to power relay
- +
Relay
-
+
-
+
Alarm device
(e.g. siren)
+
-
3-4 V battery
to power relay
Figure 28:
External alarm schematic
•
+ from DNR900 goes to – of the Relay inputs
•
+ of Relay input goes to battery that powers the Relay
•
Load inputs of the Relay go to the Alarm device e.g. siren,
lights, etc.
•
- of the battery goes to – of DNR900.
Note:
Maximum load of the Relay is 50 mA, 3 V.
Refer to
Appendix A: DataNet Specifications for the full
external alarm output specification.
3.7.7.
Polarity
Current, voltage, thermocouples and user defined sensors
have distinct polarity. Be careful to connect them in the right
polarity.
Содержание DataNet
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