User manual

Publication AG-UM008C-EN-P - February 2005
Glossary 5
RXD Received Data. A serialized data input to a receiving device.
Remote Station A device (programmable controller with I/O modules) that is
located in a remote site away from the master station and that
controls I/O points at the remote site. A remote station accepts
commands from and can send data (if capable) to a master station
via a telemetry network.
SCADA Supervisory Control and Data Acquisition
Slave See remote station.
Slave Protocol See Half-Duplex Protocol.
Serial Port An electrical connection on a computer that handles data bits one
after another; the communications port (COM1 or COM2) to
which devices such as a modem, a mouse, or a serial printer can
be attached.
Spurious Character A false or unexpected character received when none is expected.
Standard Radio Modem A standard radio modem is an assembly that contains both a radio
and a modem, which transmits data without any special handling.
Data error checking is the responsibility of the receiving station
(DTE).
Station Any programmable controller, computer, or data terminal
connected to, and communicating by means of, a data channel; a
device on a network.
Station Addressing The syntax allowing packets to be routed correctly between
master and remote stations.
Synchronous Transmission A type of serial transmission that maintains a constant time
interval between successive events.
Telemetry Transmission and collection of data obtained by sensing real-time
conditions.
Topology The way a network is physically structured. Example: a ring, bus,
or star configuration.
Transceiver An electronic device that operates as both a radio transmitter
and receiver.
TXD Transmitted Data. An output from the module that carries
serialized data.