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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.
MDS 05-7280A01, Rev. A
MDS TransNEXT Technical Manual
57
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