LonTalk Input Operator

Operator Menu Location: Generic Hardware Operators Networking Lontalk

Operator Bitmap:
 

Functional Description:
The LonTalk Input Operator generic hardware operator provides access to a networking channel resource in the physical hardware. When the generic operator is linked to a specific networking hardware resource, it will receive data from the Application running on the Neuron.

This data is application dependent and can include network variable values, configuration property values, or program variables. A Library and demo programs are provided for use with NodeBuilder.

The LonTalk Input Operator has three fixed pins:
•Disable Input . A HIGH input will stop updates from propagating from the application through the operator to the Schema
•Output indicates if the operator is linked with the application running on the Neuron. It is LOW if the "Link Key" was matched with a corresponding link key on the Neuron application. The output is HIGH if the operator key could not be matched with one on the Neuron.
•Output indicates if the value has changed from the last value received from the neuron. The output is HIGH during the single schema compute cycle in which the signal value change was detected; otherwise it is LOW.
•Value Outputs . Depending on the type selected for the Input Operator, there can be 1 or more input digital or analog signals.

In Addition to the fixed pins, there can be multiple output pins based on the "Type" selection in the properties dialog. Numerous SNVTs are supported, as well as basic Neuron C types [boolean, char, int, long, s32, float, uchar, uint, ulong]

When configured for a type of SNVT, values received from the application will be scaled based on the standard Echelon scaling for that SNVT. {Note the inverse is true for the LonTalk Output Operator}

Refer to the Echelon document "LONMARK® SNVT Master List" for information on scaling factors and structures of SNVTs.

User-Defined Properties:
Signal Name. Name of the operator.

Type. This property lets you select a SNVT, or a basic Neuron C type which determines the size and scaling (if any) to be applied to this operator data.

Neuron Link Key. This property sets the key used by the Neuron application and the Schema to dynamically link operators with the Neuron application.

Display Disable Input. This property determines if the disable input pin is visible in the schema diagram. Design Pad issues a warning upon processing the schema when the pin is visible but not connected. The warning message is not issued when the pin is not visible (when this property is not checked).

Display Error Output. This property determines if the error output pin is visible in the schema diagram. Design Pad issues a warning upon processing the schema when the pin is visible but not connected. The warning message is not issued when the pin is not visible (when this property is not checked).
Display Value Change of Value Output. This property determines if the error output pin is visible in the schema diagram. Design Pad issues a warning upon processing the schema when the pin is visible but not connected. The warning message is not issued when the pin is not visible (when this property is not checked).


Comments: None.

See Also:
LonTalk Output Operator