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XW-210 WiFi™ Users Manual
sensor from the drop-down list.
Selecting sensors is simplest when the sensors are connected to the bus one at a time. The procedure is
to start with one sensor and associate it with the appropriate sensor number by selecting the sensor
address within the appropriate drop-down list. Submit the page, connect a second sensor, and press the
Sensors
tab. Associate the second sensor to the appropriate sensor number. Continue this procedure
until all sensors are set up.
Offset:
The value of the offset will be added to the sensor's reading. Normally this should be set to zero.
Alarm 1:
This setting is used to set the trigger point for an alarm condition. The numeric field specifies the
temperature/humidity at which the alarm is triggered. The “High” and “Low” radio buttons indicate
whether the alarm is triggered as a high or low alarm. A high alarm is triggered when the sensor reading
exceeds the alarm value, and a low alarm is occurs when the sensor reading falls below the alarm value.
Generally this value will be static, but a Register can be used as a trigger point for an alarm condition as
well. To use a Register select the desired Register using the drop down box. The value of a Register can
be changed through a basic script, and directly through the control page.
Alarm 2:
This is a second alarm trigger that works similarly to Alarm 1
Deadband:
The deadband (hysteresis) prevents alarms from triggering excessively when the measurement value
vacillates around the trigger point. With high alarms, the measurement must fall below the high alarm
point minus the dead band before the high alarm will be triggered again. Likewise the deadband on the
low alarm requires the measurement to rise above the low alarm point plus the deadband before the low
alarm will be triggered again.
For example, if the dead band is set to 0.5°C, and a high alarm is set at 13°C, the high alarm will occur at
13°C; however, it will not turn off until the temperature drops below 12.5°C (13°C - 0.5°C).
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Xytronix Research & Design, Inc.
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