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Configuring the Model 1133A
7.6
Configure Ports – DNP 3.0 Protocol
DNP 3.0 (Distributed Network Protocol) is a set of communications protocols used between
components in process automation systems. It is mainly used by utilities such as electric and
water companies. When configured, the 1133A will respond to Class 0 polling commands for data
using DNP 3.0 protocol. These commands may originate from application software or devices
programmed to poll the 1133A for Class 0 data.
While DNP data can be accessed through SERIAL 1, SERIAL 2, and the Ethernet port (using
other software), DNP 3.0 is configured through the Configure Ports window shown below. This
PSCSV interface allows you to configure all of the settings necessary for using your DNP 3.0 utility.
Figure 7.6: Selecting DNP in COM Port 1 Setting
1. Make certain that there is an open connection with the 1133A and that you are logged on
with permission to configure. If you are not, see “Basic Configuration Requirements” in the
introduction of this section.
2. Select Connection
>
Configure
>
Communication Ports or click the Communication Ports
button.
In the left panel, select the port that you wish to configure.
Figure 7.6 shows
Communications Port 1 selected with the Protocol drop down list revealed.
3. Configure DNP scaling values from the same (Configure Ports) window, however move down
the list on the left panel and select DNP. This will open another panel for DNP Settings. See
Figure 7.7 for details on DNP Settings. Choose appropriate values and click OK.
Max App Frag Size refers to the size in bytes of application messages packaged into fragments,
and may be up to 2048 bytes.
7.6.1
Configuring Class 0 Data
DNP Class 0 is a predefined data set, however some older relays are only able to poll for a limited
set of Class 0 data. In a sense it is not really Class 0, once limited. However, to accommodate these
older devices, you can alter the definition of Class 0 by selecting from the lists exactly the type