Skip to content

Devices

A device is any hardware component that can be connected to the NetLinx bus. Each device must be assigned a unique number to locate that device on the bus.

A device specification in NetLinx can be expressed in one of two ways:

  • Device Number - The compiler replaces the device number with an internally generated DEV structure. This DEV structure contains the specified device Number, a value of one (1) for Port indicating the first port, and a value of zero (0) for System indicating this system (the system that is executing the code).

  • Device:Port:System - This notation is used to explicitly represent a device number, port and system. For example, 128:1:0 represents the first port on the device TP on this system. If the system and port specifications are omitted, (e.g. 128), system 0 (zero, indicating this system) and port 1 (the first port) is assumed.

    Syntax:

    1
    NUMBER:PORT:SYSTEM

    where:

    Number: 16-bit integer representing the Device number. Physical devices range from 1 to 32,000. Virtual devices range from 32,768 to 36,863.

    Note

    These numbers do not seem so random when represented in hexadecimal. Physical devices range from $0001 to $7FFF. Virtual devices range from $8000 to $8FFF.

    Port: 16-bit integer representing the Port number (in the range 1 through the number of ports on the device; 1 = this port).

    System: 16-bit integer representing the System number (0 = the system running this code).

See Also