Dry Contact Sensors
The Dry Contact sensor is a simple connection to burglar alarms, fire alarms, or any application that requires monitoring by the sensorProbe. Dry contact sensors are user-definable and can be used to detect many different inputs such as UPS status, security systems, air conditioning status.
These general-purpose switches can be either input or output. When used as an output it can source up to 20 milliamps. You can select the output voltage by setting the Output Level to a Low or a High. When set to Low the pin will output 0 volts. When set as a High the pin will output 5 volts.
When used as an input a switch will retain any error condition until it is read via SNMP. Therefore if a switch encounters a critical condition at any time it must report that condition before it can return to a normal state.
Input pins can be used to detect whether or not an input switch is open or closed. In combination with external sensors, input pins can detect whether a door or window is open or closed if there is a water incursion, and many other conditions.
| Measurement Range | Input: Alarm or Normal Output : Set or Reset |
| Sensor Type | Input : Open / Closed contact switch Output : High (5V) / Low (GND) |
| Contact voltage range | 5 volts pulled-up dry contacts* |
| Input Measurement Rate | Multiple readings every second |
| Normal input state is settable under software | |
| Electrical Output | Can sink up to 20mA**, when set to Low |
| Interface | |
| Communications Cable | RJ-45 jack to sensor using UTP Cat 5 wire |
| Communications Cable Max. length | 1000 Ft (305m) with approved low capacitance shielded cable or UTP |
| Power Source | Powered by the base unit. No additional power needed |
| Full auto-sense including disconnect alarm | |
| Important Note | *Dry Contacts are not isolated, don’t connect any voltage source ** Dry contact output is not suitable for directly driving a relay |
| Sensor count | 1 |
