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External Alarm
Indicates the current state of the External Alarm register. When Active, it indicates that an Alarm event was
registered and not cleared yet. An external alarm can only be cleared by SNMP or by rebooting the unit.
Input Status
Analog Input
Displays the measured input voltage, in Volts with a precision of ±8%.
Digital Input
By convention, the digital inputs are said to be ¨high¨ when the input voltage is above a threshold value of VIH
volts. Conversely, it is said to be ¨low¨ when the input voltage is below a threshold value of VIL volts. Those are
defined as LVTTL (3.3V) levels.
For reference:
VIL=0.8V maximum
VIH=2.0V minimum
Output Status
Relay Output
Displays the current status of the relay output. Activate means the relay coil is energized and contacts are closed.
Digital Output
Displays the current status of the digital output. Activate means that the open collector transistor is on and the
output is shorted to GND. Conversely, when deactivated, the transistor stops conducting and the collector is pulled
high through the internal 18.2 K pull-up resistor.
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