Applied Systems Engineering BCOM-USB User Manual

ASE2000 V2 Communication Test Set User Manual 152
Properties Tab and Protocol). If the system default is also ‘*’, then, on reception, any address is
considered valid. On transmission, 0 is used. If the value is not ‘*’, then the entered value is used
for both transmission and reception.
Dest and Source are always processed from the point of view of the master. That is, Dest
is used as the Destination address in messages sent by the ASE2000 acting as a master, or
received from an external master. For these messages, Source is the source address.
This is reversed in messages sent by the ASE2000 acting as a RTU, or received from an external
RTU (outstation). In these cases, Source is used as the destination address and Dest is used
as the source address.
Application Layer Function is the application layer function code. In most cases, this eld is
set correctly by the ASE2000 and should not be modied. The rare case where modication is
warranted is for object groups that support both read and write functions. Available application
layer function codes values are presented in a pull-down list generated by clicking in this eld.
ApplicationLayerConrm checkbox requests messages to be sent with the application conrm
bit set. This option has no impact on the ability of the ASE2000 to correctly process incoming
messages.
26.1.2. DNP3 – Object List
The bottom portion of the DNP3 properties Menu presents a list of objects and associated qualier
codes. By default, the ASE2000 supplies one object corresponding to the Exchange type. For
example, the Analog Input exchange contains one object, Object group 30: Analog Input. The
Object List is empty in Data Link-only exchanges such as Reset Link.
The object list is used for three purposes:
1. To identify an incoming message
2. To allow the user to dene variation and qualier codes for RTU Simulation
3. To allow the user to dene point values and modeling parameters for RTU Simulation
Each purpose is discussed in following sections.
26.1.3. DNP3 – Multiple Object Exchanges
►
This subsection provides instructions to congure messages that explicitly address
multiple object groups, such as a single read for both analog and binary input data. It
does not contain conguration information for Class Data scans or for read requests
that address a single object group.
The ASE2000 identies incoming messages by “best match” against the list of dened exchanges.
The highest priority in the matching algorithm is the Data Link and Application layer function
codes. The third level is the object list. Since most DNP3 messages are requests for data,
which all use the same Data Link and Application layer function codes, the object list becomes
signicant in most matches.
All requests for data use a User Data (conrm or no conrm) data link layer function code and a
Read application layer function code. These messages are distinguished by the object or list of
objects they read. The ASE2000 default exchange list includes entries for all single object reads.
For example, the default list includes a read of static analog data, a read of static binary data,
and so on. The user may build new exchanges for multiple object reads, for example, a single
request to read both analog and digital data.

Applied Systems Engineering BCOM-USB Specifications

General

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