Using the FrontEnd
Device Configuration
For each device listed in the Device List (on the left
side of the main window), you can manually configure scan
parameters, to fine tune data acquisition. You can easily identify
which devices are active or inactive for real-time monitoring.
Device List View
To manually add a device, use the "Add Device" button on the
toolbar, or right-click any empty space on the device view and
choose "Add Device" from the context menu. To edit the properties
of an already added device, you can select the device and then use
the "Device Properties" button on the toolbar, or right-click the
device and choose "Device Properties" from the context menu.
Device Toolbar
Both options(adding a device or editing its properties) will
display a detailed configuration dialog box:
Device Configuration Dialog
You can customize the following device settings in the
General Tab:
-
IP Address: Configured IP address for the specified device.
-
Device Description: A short description of this device.
-
Community: SNMP community for OID reads (acts like a SNMP
device password).
-
Item Name Delimiter: The separator character to use in the
fully qualified OPC name.
-
SNMP Version: SNMP procotol version to be used for data
aquisition. Note that the SNMPv3 authentication leaves the
SNMP communication very slow.
-
SNMP V3 Auth Username: The username used to access SNMP V3
devices.
-
SNMP V3 Auth Password: The password used to access SNMP V3
devices.
-
SNMP V3 Auth Algorithm: The algorithm to criptograph the
login in SNMP V3 device connection.
-
Read Timeout: Amount of time (in milliseconds) to wait for a
response from the device.
-
Group OID Reads: Number of SNMP variables to be read in the
same SNMP call.
-
Refresh: Device refresh rate in milliseconds.
-
Trap Hold Time: Amount of time to hold before resetting a
trap item.
-
Scan Active: Defines whether the device will be monitored or
not.
Some device settings are critical. This means that they may be
changed only for optimization purposes. Also some devices do not
support scanning too many variables in the same SNMP call, so you
might have to change the Group OID Reads configuration to
use such devices.
For each health tag, two calculation ways are possible: by baseline
and threshold adjustment or using the sensibility adjustment.
Health calculation example
You can configure these options by two ways:
-
Condition based: Select the desired value manually. Select
Condition Based Bias Adjustment option and then manage
baseline and threshold boxes. Baseline indicates the desired
value of the tag while threshold is the desired tolerance for
it.
-
Sensibility based: The health calculation is made using the
real value of the tag and a multiplier. Select
Sensibility Based Adjustment and then, select the
desired multiplier using the multiplier bar.
These options are found in Health Calculation tab for
three different Performance Tags:
-
Utilization Adjustment: percentual interface utilization.
Default baseline value is 5, while threshold default value is
35.
-
-
Broadcast Rate Adjustment: amount of broadcast packets
through this interface in packets/second. XRatel recommends the
values 256 and 512 for baseline and threshold respectively.
-
Transmission Effectiveness Adjustment: percentual interface
transmission integrity. Baseline and threshold defaults values
are 95 and 80 percent respectively.
The Reset to Defaults button resets all values to default
XRatel values.
Health Calculation Settings
After editing or adding the device, just click on the OK
button to close the Device dialog and update the device
settings. If you want to discard all changes, just click the
Cancel button to close this dialog.
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