Echelon LonBridg Server Manual de usuario descargar pdf (Pagina 53)

LonBridge Server User’s Guide 47

...

</attribute>

</byte>

</nv>

...

</attribute>

</byte>

</nv>

</byte>

</nv>

</nvs>

At this point, the <nvs> element is missing important information, such as the

network variable indexes, their lengths, and the byte indexes for fields within the

network variable (if any). However, it does show the three network variables

that the device class file requires for the simplified Lamp Module. In addition,

because the state of the device can be “on” or “off”, the <nv> elements for the

state

attribute includes enum=”true” so that we can define an enumeration of the

states.

See

Browse the XIF File to Determine Indices

on page 56 to determine the

network variable indexes.

The next step is to determine network variable lengths and byte indexes.

Use the Resource Editor to Determine Attributes

Because the three network variables for the simplified Lamp Module are

standard network variable (SNVT) types, you can use the Echelon NodeBuilder

Resource Editor (or the LONMARK Resource Files Web page,

types.lonmark.org)

to determine the attributes of each network variable and network variable field.

You can obtain the most current version of the LonMark Resource Files from

www.lonmark.org/technical_resources/resource_files/.

For the simplified Lamp Module, the three network variables are declared as:

• SNVT_switch_2 nviValue

• SNVT_switch_2 nvoValueFb

• SNVT_power nvoPower

You can use the Resource Editor to determine the following information about

each of the SNVT types:

• The overall size of the network variable, in bytes

• The byte index value for each field within the network variable

• The length of each field within the network variable, in bytes

• Enumeration values (if any) for network variable fields

• Scaling factors (if any) for network variable fields

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