Network variables – Echelon NodeBuilder FX User Manual
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14
Introduction
Field Description
format 8 or 9.
Manufacturer ID (M) A 5 hex-digit ID that is unique to each L
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device manufacturer.
The upper bit identifies the manufacturer ID as a standard manufacturer
ID (upper bit clear) or a temporary manufacturer ID (upper bit set).
• Standard manufacturer IDs are assigned to manufacturers when they
join L
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M
ARK
International, and are also published by L
ON
M
ARK
International so that the device manufacturer of a L
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M
ARK
certified
device is easily identified. Standard manufacturer IDs are never
reused or reassigned. If your company is a L
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M
ARK
member, but
you do not know your manufacturer ID, you can find your ID in the
list of manufacturer IDs at
he most current
list at the time of release of the NodeBuilder tool is also included with
the NodeBuilder software.
• Temporary manufacturer IDs are available at no charge to anyone on
request by filling out a simple form
Device Class (C)
A 4 hex-digit value identifying the primary function of the device. This
value is drawn from a registry of pre-defined device class definitions. If
an appropriate device class designation is not available, L
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M
ARK
International Secretary will assign one, upon request.
Usage (U)
A 2 hex-digit value identifying the intended usage of the device. The
upper bit specifies whether the device has a changeable interface. The
next bit specifies whether the remainder of the usage field specifies a
standard usage or a functional-profile specific usage. The standard usage
values are drawn from a registry of pre-defined usage definitions. If an
appropriate usage designation is not available one will be assigned upon
request. If the second bit is set, a custom set of usage values is specified
by the primary functional profile for the device.
Channel Type (T)
A 2 hex-digit value identifying the channel type supported by the device’s
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transceiver. The standard channel-type values are drawn
from a registry of pre-defined channel-type definitions. A custom
channel-type is available for channel types not listed in the standard
registry.
Model Number (N)
A 2 hex-digit value identifying the specific product model. Model
numbers are assigned by the product manufacturer and must be unique
within the device class, usage, and channel type for the manufacturer. The
same hardware may be used for multiple model numbers depending on the
program that is loaded into the hardware. The model number within the
program ID does not have to conform to your published model number.
See the for more
information about program IDs.
Network Variables
Applications exchange information with other L
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devices using network variables. Every
network variable has a direction, type, and length. The network variable direction can be either input
or output, depending on whether the network variable is used to receive or send data. The network
variable type determines the format of the data.