Echelon LonBridg Server Manual de usuario descargar pdf (Pagina 34)

28 LonBridge API

can act on the change (for example, update a GUI window) without waiting

for the response from the remote L

ONWORKS device.

The <is_pending> message is usually followed by the <is> message.

The attributes for the <is_pending> message vary depending on the device

and the original output message for which this message is the response. The

reported attributes include a fixed set of attributes that identify the device,

followed by the attributes defined within the <device> element in the

devices.xml file. The fixed and variable attributes are defined in

Instances

Directory

on page 16.

<lon>

The <lon> element defines the LonBridge XML message, and is the top-most

element for the message.

The <lon> element is required, and only one <lon> element is allowed per

message.

LonBridge Commands for Output Messages

A LonBridge application sends LonBridge output messages to the LonBridge

Server to manage and communicate with devices within the L

ONWORKS network.

The LonBridge XML for output messages includes the following XML elements:

The <discover> message instructs the LonBridge Server to perform device

discovery.

<get>

The <get> message retrieves an object and its attributes with optional

matching criteria. If no object or criteria is specified, the LonBridge Server

returns all objects and their attributes. If an object or criteria is specified

but, no objects match the criteria, the LonBridge Server returns an empty

message (that is, <lon></lon>).

Table 5 lists the attributes for the <get> message.

Table 5. Attributes for the <get> Message

Attribute Description Required?

select Specifies a comma-separated list of

returnable attribute names. If omitted, all

attributes are returned.

Optional

where Specifies an expression that must evaluate

to TRUE for the attribute to be returned.

Required if

select is

specified

<lon>

The <lon> element defines the LonBridge XML message, and is the top-most

element for the message.

1 2 ... 29 30 31 32 33 34 35 36 37 38 39 ... 66 67

Comentarios a estos manuales

Sin comentarios

Echelon LonBridg Server Manual de usuario Pagina 34

Comentarios a estos manuales

Relacionado con productos y manuales para Software Echelon LonBridg Server