MDS 05-7280A01, Rev. A
MDS TransNEXT Technical Manual
57
Hardware Flow Control:
A feature used to prevent data buffer overruns when the unit is handling high-
speed data from an RTU or PLC. When the buffer approaches overflow, the unit drops the clear-to-send
(CTS) line, which instructs the RTU or PLC to delay further transmission until CTS again returns to the
high state.
Host Computer:
The computer installed at the master unit, which controls the collection of data from
one or more remote sites.
IP:
Internet Protocol
ISM
: Abbreviation for “Industrial, Scientific, Medical” band. The 900MHz ISM band is where
TransNEXT operates.
LAN:
Local Area Network
LED:
Light Emitting Diode
mA:
Milliamperes
Poll:
A request for data issued from the host computer (or master PLC) to a Remote unit.
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.
PPM:
Parts per Million
Programmable Logic Controller
: See
PLC
.
Remote Terminal Unit
: See
RTU
.
RTS:
Request-to-send
RTU:
Remote Terminal Unit. A data collection device installed at a Remote unit site.
RX:
Abbreviation for “Receive.”
SAF (Store and Forward):
An available feature of the unit whereby data is stored by a designated
Remote, and then retransmitted to a station beyond the communication range of the Master.
SCADA (Supervisory Control And Data Acquisition):
An overall term for the functions commonly
provided through a multiple address radio system.
Signal-to-Noise Ratio
:
See SNR.
SNR (Signal-to-Noise ratio):
A measure of how well the signal is being received at a radio relative to
noise on the channel.
SSH:
Secure Shell protocol for a network that allows users to open a window on a local PC and connect
to a remote PC as if they were present at the remote.
Supervisory Control And Data Acquisition
: See
SCADA
.
TX:
Abbreviation for “Transmit.”
Unlicensed: Typically referring to unlicensed operation, whereby end users do not need to apply for
license prior to installing or using certain classes of radios. TransNEXT is a FHSS radio designed for
use in the unlicensed 900MHz ISM band.
YMODEM
: This is a simple file transfer protocol originally introduced in 1985. TransNEXT uses
YMODEM to support uploads of MPK firmware.
Summary of Contents for MDS TransNEXT NET9L
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