SPX+ Introduction Manual - updated until firmware 4997
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Dry Contact Sensors
With the user definable Dry Contact Sensor you can monitor a variety of devices and alarm panels
with Dry Contact inputs, such as UPS status, security systems, air conditioning status, burglar alarms,
fire alarms or any application that requires monitoring by the sens.
Depending on your configuration, the Dry Contact Sensors are available in
5VDC input
,
I/O
and
Isolated
configurations. LED indicators show the status of each individual Dry Contact.
These general purpose switches can be either input or output. When used as an output it can source
up to 20 mAs. 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.
The input pins work by sensing the presence of a voltage level on an input pin. When the switch is
open, the voltage is different than when the switch is closed.
To test a Dry Contact input, wire ground to one side of the switch. Wire the other side of the switch to
the switch sensor. Set the Normal State field to Open. Set the Direction field to Input. When the
switch closes, the input pin will be shorted to ground and the switch will change state from normal to
critical.
Specifications & Features:
Measurement Indication - Alarm or Normal
Sensor type - open/closed contact switch
The sens auto detects the presence of the Voltage Sensor
Measurement rate - multiple readings every second
