WDS 2710 Series, Техническое руководство, Страница: 54 / 62

46 05-3305A01, Rev. E
Network-Wide Diagnostics
—
An advanced method of controlling and
interrogating our radios in a radio network.
Non-intrusive diagnostics
—
See Passive messaging .
Passive messaging
—
This is a mode of diagnostic gathering that does
not interrupt SCADA system polling communications. Diagnostic data
is collected non-intrusively over a period of time; polling messages are
carried with SCADA system data (contrast with
active messaging ).
Payload data
—
This is the application
’
s user communication data
which is sent over the radio network. It is the transfer of payload data
that is the primary purpose of the radio communications network.
Point-Multipoint System
—
A radio communications network or
system designed with a central control station that exchanges data with
a number of remote locations equipped with terminal equipment.
Poll
—
A request for data issued from the host computer (or master PLC)
to a remote radio.
PLC
—
Programmable Logic Controller. A dedicated microprocessor
configured for a specific application with discrete inputs and outputs. It
can serve as a host or as an RTU.
Programmable Logic Controller
—
See PLC .
Remote (Station)
—
A radio in a network that communicates with an
associated master station.
Remote Terminal Unit
—
See RTU .
Redundant Operation
—
A station arrangement where two transceivers
and two power supplies are available for operation, with automatic swi-
tchover in case of a failure.
RTU
—
Remote Terminal Unit. A data collection device installed at a
remote radio site. An internal RTU simulator is provided with
4710/9710 radios to isolate faults to either the external RTU or the radio.
SCADA
—
Supervisory Control And Data Acquisition. An overall term
for the functions commonly provided through an MAS radio system.
Standing Wave Ratio
—
See SWR .
Supervisory Control And Data Acquisition
—
See SCADA .
SWR
—
Standing Wave Ratio. A parameter related to the ratio between
forward transmitter power and the reflected power from the antenna
system. As a general guideline, reflected power should not exceed 10%
of the forward power ( 2:1 SWR).