topic. Often SIGs set up bulletin boards, available only to SIG members.

Simplex

Data communications in one direction only.

Single-Digit Keying

Refers to videotex systems where you only need to press one numeric key from an index. See also Double-Digit Keying.

Software

Computer program or set of computer programs held in storage, and loaded into RAM for execution.

Software Downloading

Known as software downloading or teleloading on videotex systems and downloading on some bulletin boards. Refers to the transferring of software from a remote system to your computer.

Software Handshaking

A method of controlling the flow of data between two computers or terminals. Special control characters are sent from one terminal to the other in order to halt or re-commence the flow of data. See also Hardware Handshaking.

SOH

Start Of Header used in synchronous transmissions indicating the start of a header block.

Space

One of the two possible states of a binary data element. The open circuit condition in a teleprinter circuit. Also see Mark.

Special Interest Group

See SIG.

Start Bit

When a character is transmitted asynchronously to another computer, a start bit always precedes the actual data. Seven or eight data bits, an optional parity bit and a stop bit will follow.

Stop Bit

The last bit or element transmitted in asynchronous transmission of a character to return the circuit to an idle state. One or two stop bits are sent at the end of each character of data.

STX

Start Of Text control character used in synchronous transmission which precedes the text

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Telenetics 56 manual Soh, Stx