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5. DNP3 Ethernet Communication Setup Configuration Utility
PXM 4/6/8K DNP3 Ethernet Communications User Manual
MN150005EN January 2017 www.eaton.com
Figure 9. Communication Related Parameters Page.
5.3.1 DNP Application Layer
In this section, the User can set the parameters related to
DNP Application Layer that follow.
1. Application Layer Multiple Layer Confirmation
If the checkbox is selected, it means that a confirmation
message is expected from DNP master in response
to an application layer frame sent by PXM meter. For
example, assume that the application frame from the
PXM meter to DNP master consists of events data
which are stored in PXM meter buffer. If this option
is selected and if the PXM meter does not receive an
application layer confirmation from the DNP master,
then the PXM meter shall not delete currently stored
events from its buffer.
If the checkbox is not selected, then it means that a
confirmation message is not expected from the DNP
master in response of an application layer frame sent
by the PXM meter.
2. Application Layer Multiple Fragment Responses
Allowed
This parameter indicates weather the PXM meter
is allowed to send multiple application fragments in
response to the request from the DNP master. It is
possible that data which needs to be sent to the DNP
master may not fit into a single application fragment.
In such case, if this option is selected then the PXM
meter shall send multiple application frames to send
complete data. Otherwise, if this option is cleared (i.e.
unchecked) then the PXM meter shall send only single
application frame to the DNP master. In this case, it
is up to the DNP master to send multiple requests to
make sure that all expected data is fetched from the
PXM meter stopped.
3. Application Layer Multiple Fragment Length
This parameter indicates the maximum length of an
application frame which the PXM meter shall transmit.
It is possible in certain cases that the buffer reserved in
the DNP master for reception of data is less than what
the PXM meter can transmit. To match the reception
requirement of a DNP master, this parameter is con-
figurable in the PXM meter. The range provided is from
50 to 2,048 bytes.