RF Innovations RFI-9256, Руководство по эксплуатации

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G L O S S A R Y
©
© ©
© RF Innovations Pty Ltd, 1998 Page: 101
223889, Revision 2.2
Redundancy Check
Technique of error detection involving the transmission of additional data related to the message so that the receiving device
can determine if the data transmitted is valid (error-free).
% Registers
Registers inside the modem that usually contain string values. Can be read and altered on a remote modem using a
Communications Link. Examples include Unit Name, Security Code and Local Address.
Remote Configuration
The accessing of information from a remote radio and the ability to change the remote radio’s attributes via a
Communications Link.
Remote System
Another PC or network that can be communicated with via modem.
Repeater
Radio that receives and repeats the signal in a communications path, to extend the range between the End Point Radios. They
do not act on the information, only pass it on.
Request to Send (RTS)
Control signal by the DTE to inform the DCE that it is ready to transmit data. When used for flow control between the DTE
and the modem, this signal indicates to the modem that the DTE is ready to accept data. Used mainly in half-duplex
communications.
Response Codes
Also called Result Codes. Screen messages that indicate what the modem is doing. For example, OK will appear when a
command has been executed successfully.
RF Channels
Steps or intervals of frequency divisions in the 915-928MHz spectrum. 51 channels available.
Routing Table
A table that is used by the radios to convert packet addresses into radio addresses.
Router
Guides data through a network by the address of the data.
RS-232C
Frequently shortened to RS-232. A standard, which defines the physical and electrical interface between Data
Communications Equipment and Data Terminal Equipment. The most commonly used interface between modems and
computers. Also known as ITU-T V24.
RSSI Trigger Level
Signal threshold/trigger level in dBm. This is the level at which the radio decides what it is hearing is no longer noise.
RTS/CTS
Control characters for hardware handshaking.
RTU
Acronym for Remote Terminal Unit. Device attached to remote radio.
Rx
Abbreviation for Receive.
S
Security Code
4 digits, same as a PIN number. The code is known only to the user and protects the user from interference from other
networks using RFI-9256 modems.
Serial Data
Data transmission in which each bit of information is sent sequentially through a single data path.
Serial Logging
Shows information regarding the performance of both serial ports.