Applied Systems Engineering BCOM-USB User Manual

ASE2000 V2 Communication Test Set User Manual 151
26.1.1. DNP3 – Fields
Name is used to identify the exchange on the Line Monitoring and Messages views. This eld is
normally not modied since default names reect exchange functionality. The name is not used
by ASE2000 internal processing.
Frequency denes how often a message is to be transmitted (in seconds). It is applicable in
Master Simulation Mode when communication is started with the Send Continuous or Start
button. In RTU Simulation Mode, it is used for unsolicited data reporting. It is not applicable in
Line Monitoring Mode.
When Send Continuous is selected, the selected exchange message is sent immediately and,
thereafter, at regular intervals specied by the Frequency.
When Start is selected in Master Simulation mode, each exchange with its Transmit ag
set is transmitted at the associated frequency. The rst transmission occurs at the frequency
interval after Start, with subsequent transmissions periodically thereafter. For example, if two
exchanges both have the Transmit ag set, one with a frequency of 2.0 seconds and another
with 3.0 seconds, the rst exchange is sent 2 seconds after Start is pressed and every 2 seconds
thereafter. The second exchange is sent 3 seconds after Start is pressed and every 3 seconds
thereafter.
A special frequency value of 0 seconds (along with setting the Transmit ag) causes the
exchange to be sent once immediately after Start is pressed.
Note that frequency settings dene the desired transmission rate. An exchange is never sent
before processing of the prior exchange has terminated, either because the entire response has
not yet been received or because no response has been received and the response timeout
period has not yet expired.
For RTU Simulation, frequency denes how often an “unsolicited data reporting” message is
transmitted. Frequency is not used if not operating in unsolicited data reporting mode.
DisplayandEventags are as dened in the main ASE200 document. There is no special
meaning for DNP protocols.
Transmitag causes a message to be transmitted according to rules discussed for the frequency
setting, above.
Data Link Layer Function is used to select the function code to transmit. Except for one case,
this eld is informational and should not be altered. The one case where it can be changed is to
switch between UserData(NoConrm) and UserData(Conrm). If the default function code
is either of these, it can be safely modied to the other. The setting (Conrm or Not) is not used
for processing incoming messages.
Data Link Layer PRM and FCV checkboxes dene whether or not the PRM and FCV bits
should be set in the function code byte. The ASE2000 always sets these elds correctly based
on the Data Link function code. If modied, an incorrectly formatted message will be sent. The
checkboxes are included in this menu only for that purpose, that is, to transmit an incorrectly
formatted message to verify error handling by another DNP3 device.
Dest and Source dene the exchange’s Destination and Source addresses. Either an ‘*’ or
specic value can be entered. An ‘*’ instructs the ASE2000 to use the system default (see

Applied Systems Engineering BCOM-USB Specifications

General

Brand	Applied Systems Engineering
Model	BCOM-USB
Category	Measuring Instruments
Language	English