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Remote System
Usually a bulletin board or videotex system that registered users or the public can dial up and
communicate with via modem.
Request to Send
RS-232 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.
Ring Indicator
RS-232 control signal used by the DCE to inform the DTE that it is receiving a ringing signal.
ROM
Read Only Memory.
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 CCITT V24.
RTS
An acronym for Request To Send. This signal is generated by the terminal or computer
indicating that it requires to send data to the modem. Used mainly in half-duplex
communications.
S
SDLC
The standard Synchronous Data Link Control protocol used by IBM for products which
conform to its System Network Architecture.
Serial Data
Data transmission in which each bit of information is sent sequentially through a single data
path.
Shareware
An extension of public domain software. Individuals can obtain copies of software for free from
bulletin boards or other computer users. If the software is useful to them, they are encouraged to
send a small fee to the program’s author, usually for a printed manual, registration and any
software updates that are available. See also Public Domain Software.
SIG
An acronym for Special Interest Group. Groups of user’s who share an interest in a particular