Language Elements
42
NetLinx Programming Language Reference Guide
 Device:Port:System (D:P:S): This notation is used to explicitly represent a device number,
port, and system. For example, 128:1:0 represents the first port of the device number 128 on
this system. The syntax:
NUMBER:PORT:SYSTEM
Parameters:
Device arrays
In order to specify a group of devices for a command or event handler, NetLinx provides the capability to
define an array of
DEVs and treat it as a device array. A device array may be used anywhere a device
specification is required. The result provides a range of targets for the command or instruction where it is
used.
Device arrays are declared in the
DEFINE_VARIABLE section of the program in one of two ways:
DEV DSName[ ] = {Dev1, Dev2, ..., Devn}
DEV DSName[MaxLen] = {Dev1, Dev2, ..., Devn}
Each device name appearing on the right-hand side of the declaration should be defined as a device in the
DEFINE_DEVICE section; however, it can also be defined in the DEFINE_VARIABLE or
DEFINE_CONSTANT section.
The first statement above declares a device array whose maximum length is determined by the number of
elements in the initialization array on the right-hand side.
The second form uses
MaxLen to specify the maximum length of the device array. In either case, the
number of elements in the initialization array determines the effective length of the device array. That
value can be determined at run-time by calling
LENGTH_ARRAY. The maximum length available for a
device array can be determined by calling
MAX_LENGTH_ARRAY.
The following program fragment illustrates device array initialization:
DEFINE_DEVICE
panel3 = 130
DEFINE_CONSTANT
DEV panel1 = 128:1:0
integer panel2 = 129
DEFINE_VARIABLE
// dvs is an array of three devices:
// 128:1:0
// 129:1:0
// 130:1:0
DEV dvs[ ] = {panel1, panel2, panel3}
The individual elements of a device array can be referenced by their defined names (Dev1, Dev2, etc.)
or by using array notation with the device array name. For example, the 3rd device in the device array,
MyDeviceSet, would be referenced by MyDeviceSet[3].
Number 16-bit integer representing the Device number
Port 16-bit integer representing the Port number (in the range 1 through
the number of ports on the device)
System 16-bit integer representing the System number (0 = this system).
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