Raritan Computer EMX2-111 Manual Do Utilizador
Chapter 8: Managing External Devices
176
Setting Data Logging
The EMX can store 120 measurements for each sensor in a memory
buffer. This memory buffer is known as the data log. Sensor readings in
the data log can be retrieved using SNMP.
buffer. This memory buffer is known as the data log. Sensor readings in
the data log can be retrieved using SNMP.
You can configure how often measurements are written into the data log
using the Measurements Per Log Entry field. Since the environmental
sensors are measured per second, specifying a value of 60, for example,
would cause measurements to be written to the data log once every
minute. Since there are 120 measurements of storage per sensor,
specifying a value of 60 means the log can store the last two hours of
measurements before the oldest one in log gets overwritten in the log.
using the Measurements Per Log Entry field. Since the environmental
sensors are measured per second, specifying a value of 60, for example,
would cause measurements to be written to the data log once every
minute. Since there are 120 measurements of storage per sensor,
specifying a value of 60 means the log can store the last two hours of
measurements before the oldest one in log gets overwritten in the log.
Though the environmental sensors are measured per second, their
readings may not be updated per second. See
readings may not be updated per second. See
Information about
Update Interval
(on page 177). The update interval varies depending on
how many environmental sensors are connected to the EMX device and
the sensor type. The more the environmental sensors are connected, the
larger the update interval is. Therefore, type a large number in the
Measurements Per Log Entry field when there are a large number of
environmental sensors connected.
the sensor type. The more the environmental sensors are connected, the
larger the update interval is. Therefore, type a large number in the
Measurements Per Log Entry field when there are a large number of
environmental sensors connected.
Whenever measurements are written to the log, three values for each
sensor are written: the average, minimum and maximum values. For
example, if measurements are written every minute, the average of all
measurements that occurred during the preceding 60 seconds along with
the minimum and maximum measurement values are written to the log.
sensor are written: the average, minimum and maximum values. For
example, if measurements are written every minute, the average of all
measurements that occurred during the preceding 60 seconds along with
the minimum and maximum measurement values are written to the log.
Note: The EMX's SNMP agent must be enabled for this feature to work.
See
See
Enabling SNMP
(on page 202) for more details. In addition, using
an NTP time server ensures accurately time-stamped measurements.
Enabling Data Logging
By default, data logging is disabled. Only users having the
"Administrator" or "Change Data Logging Settings" permissions can
enable or disable this feature. See
"Administrator" or "Change Data Logging Settings" permissions can
enable or disable this feature. See
Setting Up Roles
(on page 69).
To configure the data logging feature:
1. Choose Device Settings > Data Logging. The Data Logging Options
dialog appears.
2. To enable the data logging feature, select the "enable" checkbox in
the Enable Data Logging field.
3. Type a number in the Measurements Per Log Entry field. Valid range
is from 1 to 600. The default is 60.
4. Select the environmental sensors whose data logging you want to
enable.