Satec Expertmeter EM720 Operation Manual page 118

Chapter 5 Configuring the EM720
Configuring DNP Class 0 Response
118
Scaling 16-bit AI objects
Scaling 16-bit AI objects allows accommodating native 32-
bit analog input readings to 16-bit object format;
otherwise it may cause an over-range error if the full-
range value exceeds a 16-bit point limit.
Scaling is enabled by default. It is not applied to points
that are read using 32-bit AI objects.
Refer to the EM720 DNP3 Reference Guide for information
on the data point scales and on a reverse conversion that
should be applied to the received scaled values.
Scaling 16-bit Binary Counters
Scaling 16-bit Binary Counters allows changing a counter
unit in powers of 10 to accommodate a 32-bit counter
value to 16-bit BC object format.
If the scaling unit is greater than 1, the counter value is
reported being divided by the selected scaling unit from
10 to 1000. To get the actual value, multiply the counter
reading by the scaling unit.
The most common method of getting static object
information from the device via DNP is to issue a read
Class 0 request. The EM720 allows you to configure the
Class 0 response by assigning ranges of points to be
polled via Class 0 requests.
To view the factory-set DNP Class 0 assignments or
build your own Class 0 response message:
1. From the Meter Setup menu select Protocol Setup
and click on the DNP Class 0 Points tab
2. Select the object and variation type for a point
range.
3. Specify the start point index and the number of
points in the range. Refer to the EM720 DNP3
Reference Guide for available data points.
4. Repeat these steps for all point ranges you want to
be included into the Class 0 response.
5. Click Send to download your setup to the device.
The factory-set Class 0 point ranges are shown in the
picture below.
EM720 Power Quality and Revenue Meter
Configuring Communication Protocols