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Chapter 8: Managing External Devices
180
"normal" State
This state indicates the sensor is in the normal state.
For a contact closure sensor, usually this state is the normal state you
have set.
If the normal state is set to Normally Closed, the normal state means
the contact closure switch is closed.
If the normal state is set to Normally Open, the normal state means
the contact closure switch is open.
For a Raritan's floor water sensor, the normal state must be set to
Normally Closed, which means no water is detected.
Note: See Configuring a Contact Closure Sensor (on page 37) for
information on setting the normal state or dip switch. For the onboard
contact closure sensor termination, see Connecting Third-Party
Detectors/Switches to the EMX (on page 38) for how to set the normal
state.
For a numeric sensor, this state means the sensor reading is within the
acceptable range as indicated below:
Lower Warning threshold <= Reading < Upper Warning threshold
Note: The symbol <= means smaller than (<) or equal to (=).
"alarmed" State
This state means a discrete (on/off) sensor is in the "abnormal" state.
Usually for a contact closure sensor, the meaning of this state varies
based on the sensor's normal state setting.
If the normal state is set to Normally Closed, the alarmed state
means the contact closure switch is open.
If the normal state is set to Normally Open, the alarmed state means
the contact closure switch is closed.
Note: See Configuring a Contact Closure Sensor (on page 37) for
information on setting the normal state or dip switch. For the onboard
contact closure sensor termination, see Connecting Third-Party
Detectors/Switches to the EMX (on page 38) for how to set the normal
state.
Tip: A contact closure sensor's LED is lit after entering the alarmed state.
If the sensor module has two channels for connecting two switches, two
LEDs are available. Check which contact closure switch is in the
"abnormal" status according to the channel number of the LED.