LOYTEC L-DALI - User Registers; Structures

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L-DALI User Manual 115 LOYTEC

Version 5.2 LOYTEC electronics GmbH

o ICMP: Allows incoming ICMP packets (recommended).

6.1.10 User Registers

The device can be configured to contain user registers. In contrast to system registers, these

are only available as a part of the data point configuration. User registers are data points on

the device that do not have a specific technological representation on the control network.

Thus, they are not accessible over a specific control network technology.

A register merely serves as a container for intermediate data (e.g., results of math objects,

calculation parameters). The register can have the following, basic data types:

 Double: A register of base type double is represented by an analog data point. It can

hold any scalar value. No specific scaling factors apply.

 Signed Integer: A register of base type signed integer is represented by a multi-state

data point. This register can hold a set of discrete states, each identified by a signed

stats ID.

 Boolean: A register of base type Boolean is represented by a binary data point. This

 String: A register of base type string is represented by a string data point. This register

can hold a variable-length character string in UTF-8 format.

 Variant: A register of base type variant is represented by a user data point. This

is defined when creating the register and cannot be changed at run time.

Since a register has no network direction, it can be written and read. Therefore, it is created

as a value data point by default. It is also possible to create two data points for each register,

one for writing the register (output) and one for reading the register (input). In this case a

suffix is added to the register name to identify the respective data point. For example, the

MyValue_Write.

6.1.11 Structures

Complex data belonging semantically together may be structured. The data point model

allows mapping structure types onto user-defined data points of variant type. This can be

necessary, if a network technology carries such structured data or if a user-defined register

shall provide structured data for access through a single data point. In any case, the structure

is modeled as a top-level data point and a hierarchy of sub-data points representing the

structure members.

The top-level data point is a user data point of variant data type. It contains the image of the

entire structure as a Byte array. Each structure field is then modeled as a sub-data point of

the appropriate class (e.g. analog, binary, or multi-state). A structure field may itself be a

structure going down one level in the hierarchy of sub-data points.

An example is shown in Figure 113. In this case a user register of two Bytes is bound to a

structure type mapping the two bytes on analog data points. The two sub-data points byte_0

and byte_1.

Figure 113: Example of a structured data point.