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Communication Interfaces
90
Value Parameter
Item settings, depending on what they are, use various value types.Table 14 provides a list of the
possible value types and their description.
Table 14 Value types
Type Definition
Numeric
An integer numeric value in the units indicated by the item name. For example, a System Voltage
Rating of 480 would indicate 480 volts.
Scaled
Similar to the Numeric, this value type is an integer that has been scaled, usually to remove decimal
points that would normally appear within the value. In this case, a value of 2.5 may actually be input
as simply 25. For all Scaled types, the scaling appears in Table 15.
String
Certain settings are represented by alphanumeric character strings, such as setting the System
Model Number to ProductName.
Enumeratio
n
This type uses an indexed list to represent possible choices. One example is the Modem Baud Rate
which uses a value of 0 to select 2400 bps, 1 for 9600 bps and 2 for 19200 bps.
Bit-packed
This type of value uses a hexadecimal binary word, where each of the sixteen bits in the word has
the value of 1 (True) or 0 (False). Although somewhat difficult to use, it packs a large amount of data
within a single entry. A detailed description of this type appears in section 12.1.3 - Setting
Bitpacked Options With the Terminal.
Event
Masks
This type is a specially formatted and is used to customize the behavior of each fault and alarm in
the system. See 12.1.4 - Setting Event Masks with the Terminal for instructions on configuring
Event Mask parameters.