B&R Industries Power Panel 300 User Manual page 557

Appendix A • Glossary
TFT display
LCD (Liquid Crystal Display) technology where the display consists of a large grid of LCD cells.
Each pixel is represented by a cell, whereby electrical fields produced in the cells are supported
by thin film transistors (TFT) that result in an active matrix. In its simplest form, there is exactly
one thin film transistor per cell. Displays with an active matrix are generally used in laptops and
notebooks because they are thin, offer high-quality color displays and can be viewed from all
angles.
Touch screen
Screen with touch sensors for activating an item with the finger.
TXD
An abbreviation for "Transmit (TX) Data". A line for the transfer of serial data sent from one
device to another, e.g. from a computer to a modem. For connections complying with the RS-
232-C standard, the TXD is connected to pin 2 of the plug.
U
UART
An abbreviation for "Universal Asynchronous Receiver-Transmitter". A module generally
consisting of a single integrated circuit that combines the circuits required for asynchronous
serial communication for both sending and receiving. UART represents the most common type
of circuit in modems for connecting to a personal computer.
UDMA
An abbreviation for "Ultra Direct Memory Access". A special IDE data transfer mode that allows
high data transfer rates for drives. There have been many variations in recent times.
UDMA33 mode transfers 33 megabytes per second.
UDMA66 mode transfers 66 megabytes per second.
UDMA100 mode transfers 100 megabytes per second.
Both the mainboard and the hard drive must support the specification to implement
modifications.
USB
An abbreviation for »Universal Serial Bus« A serial bus with a bandwidth of up to 12 megabits
per second (Mbit/s) for connecting a peripheral device to a microcomputer. Up to 127 devices
can be connected to the system using a single multipurpose connection, the USB bus (e.g.
external CD drives, printers, modems as well as the mouse and keyboard). This is done by
connecting the devices in a row. USB allows devices to be changed when the power supply is
switched on (hot plugging) and multi-layered data flow.
Power Panel 300/400 User's Manual V 2.10 557