L-Proxy User Manual
61
LOYTEC
Version 3.1
LOYTEC electronics GmbH
6.4 Connections
With the use of connections data points can interact with each other. Connections specify
which data points exchange values with each other. Both types of connections - “1:
n
” and
“
m
:1” connections – are supported. The single data point is referred to as the
hub
data
point, whereas the other data points are the
target
data points.
This means, the following connections are possible:
•
1 input data point is connected to
n
output data points,
•
m
inputs data points are connected to 1 output data point.
The most common connection will be the 1:1 connection. This is the type of connection
that is auto-generated by the Configurator software. Other types must be created manually
in the Configurator.
In the 1:
n
connection the input value is distributed to all n output data points. In the m:1
connection, the most current input value is written to the output data point. When polling
the output data point in poll-through mode (maximum cache age is set on the output), the
value from the first input data point is polled.
Connections can connect data points of different technologies with each other (also mixed
among the target data points) but are restricted to the same class of data points. This means
only data points of class
analog
can exchange values within a connection.
For certain classes of data points, additional restrictions exist:
•
Analog
: The value range is capped on the output data points. This means, if the input
value in the hub does not fit into the range of an output data point, the value is capped
to the biggest or smallest allowed value.
•
Binary
: No special restrictions exist.
•
Multi-state
: Only multi-state data points of an equal number of states can be placed
into a connection. The actual state Ids need not be equal. They are ordered and the n-th
state is propagated over a connection. For example, the 2nd state on the hub has the
state ID ‘2’, while on the target the 2nd state has the state ID ‘0’.
•
String
: No special restrictions exist.
•
User
: Only user data points of the same length can be placed in a connection.
6.5 CEA-709 Technology
6.5.1 CEA-709 Data Points
Data points in the CEA-709 network are known as network variables (NVs). They have a
direction, a name, and a type, known as the standard network variable type (SNVT) or
user-defined network variable type (UNVT). In addition to NVs, also configuration
properties (CPs) in the CEA-709 network can be accessed as data points. Both standard CP
types (SCPTs) and user-defined CP types (UCPTs) are supported.
The typical procedure in configuring the L-Proxy consists of the following steps:
1.
Select the data points of the network to be used on the L-Proxy (e.g., select the NVs in
the CEA-709 network nodes)
2.
Create necessary data points on other ports
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