GL-9
Issue 3 April 1994
RTS
Request-to-Send. A signal from the computer to the modem,
sent via Pin 4 of an EIA RS-232 interface, that states the
computer has data to send.
RXD
Receive Data. Pin 3 of an EIA RS-232 interface that is used by
the computer to receive data from the modem. Conversely, the
modem uses Pin 3 to transmit data to the computer.
S
S-Registers
Registers that contain information affecting the modem
parameters. All S-Registers must be preceded by the AT prefix.
signal ground
Pin 7 of an EIA RS-232 interface.
synchronous transmission
Data transmission that is synchronized by timing signals.
Characters are sent at a fixed rate. This type of transmission is
more efficient than asynchronous transmission.
T
tone dialing
One of two dialing methods, in which telephone numbers are
sent as tones across the telephone lines.
training
A process where two modems try to establish a connection over
the telephone line.
