Echelon i.LON SmartServer 2.0 User Manual
Page 244
i.LON SmartServer 2.0 Programmer’s Reference
14-44
Property Description
This property is a string up to 227 characters long that describes
the units the value in which a network variable is measured. It
is based on the data type assigned to the network variable. A
default value will be assigned to this property if a unit for the
network variable type chosen for the data point exists in the
resource files on the SmartServer.
For scalar and enumerated data points, this property specifies
the units of measures used by the data point. For example, the
unit string of a SNVT_temp_f data point is °F. The unit string
is defined by resource files.
For structured data points, the fields within the data point are
specified in a series of
can be edited. Using a SNVT_switch data point for example,
value and state fields will be specified in a series of
(“% of full level” and “state code”). You can use the Set
function to edit the unit strings of data point fields.
The index number of the network variable within its device.
You cannot use the Set function on this property.
Displays the value that uniquely associates the network variable
with its connections. If the network variable is not a member of
a connection, the selector is set to a value representing an
unbound network variable.
For L
ON
W
ORKS
connections, a selector is a 14-bit number used
to identify connected network variable. When placing the
network variable in a L
ON
W
ORKS
connection, the SmartServer
assigns the network variable a value representing that
connection. All network variables in a given connection use the
same selector. The LNS Server shares a network variable
selector among connections if the connections share one or more
data points.
You cannot use the Set function on this property.
Indicates whether the network variable is static
(DDT_STATIC), dynamic (DDT_DYNAMIC), or is changeable
(DDT_CHANGEABLE). You cannot use the Set function to
modify this property.