Echelon IzoT BACnet Developes - Manual (Page 30)

Service Button
A push button or other actuator on a L ON W ORKS device that is used during installation to acquire the
device’s Neuron ID. For a Neuron hosted device, the button is connected to the service pin of the
Neuron Chip or Smart Transceiver. When this pin is activated, the Neuron core sends a broadcast
message containing its Neuron ID and program ID, which is called service pin message or packet. The
method used to implement the Service button varies from device to device. Examples of mechanical
methods include grounding via a push button or using a magnetic reed switch. By attaching one of the
device’s I/O pins to the service pin, the service pin can also be put under software control as long as
the application code is being executed. For example, the device can ground the pin when the device is
moved or when a predefined series of I/O occurs. The service pin can also be used to drive an LED
that indicates the device’s state. The service LED is solid on when the device is applicationless, blinks
slowly when the device has an application and is unconfigured, is off when the device has an
application and is configured. Some applications also implement additional service pin blink patterns.
Standard Configuration Property Type (SCPT)
A standard configuration property type defined by L ON M ARK International to facilitate
interoperability. SCPTs are defined for a wide range of configuration properties used in many kinds of
functional profiles, such as hysteresis bands, default values, minimum and maximum limits, gain
settings, and delay times. SCPTs should be used in a L
ON W ORKS network wherever applicable. In
situations where there is not an appropriate SCPT available, manufacturers may define UCPTs for
configuring their devices.
In addition to standard or user-defined network variable types, which define the data type, formatting
rules, limits and units, SCPT also define semantics. For example, the SNVT_time_sec standard
network variable type defines a data type for exchanging durations of time, in seconds. The
SCPTmaxSentTime standard configuration property type references SNVT_time_sec, but adds
semantics by clarifying that this configuration property defines the maximum period of time between
consecutive transmissions of the current value. See types.lonmark.org for a current list and
documentation.
Standard Functional Profile
A standard set of functional profiles defined by L ON M ARK International. See types.lonmark.org for a
current list and documentation. See Functional Profile for more information about functional profiles.
Standard Network Variable Type (SNVT)
A standard set of network variable types defined by L ON M ARK International to facilitate
interoperability by providing a well-defined interface for communication between devices made by
different manufacturers. See types.lonmark.org for a current list and documentation.
Stencil
A collection of master shapes that can be reused in Visio.
TP/FT-10
The free topology twisted pair L ON W ORKS channel type, 78Kbps bit rate.
User-defined Configuration Property Type (UCPT)
A non-standard data structure used for configuration of the application program in a L ON M ARK device.
UCPTs should be used only when there is no appropriate standard configuration property type (SCPT)
defined. L
ON M ARK -certified devices must have UCPTs documented in resource files according to a
standard format, in order to allow the devices to be configured without the need for proprietary
configuration tools. See Standard Configuration Property Type (SCPT) for more information on
configuration property types.
30 Appendix A – Glossary