Specifications

Glossary 77

Networking Alpha Signs (9700-0112C) October 8, 2003

Open Database Connectivity. A Microsoft standard that allows databases created by various relational and

non-relational database programs (such as dBase, Access, FoxPro, and Oracle) to be accessed by a common

interface.

oil-resistant gaskets

Gaskets made of material that is resistant to oil or oil fumes.

OLE

Object Linking and Embedding. The interface that embeds an object created by one application into a

document created by another, performs drag-and-drop transfers within or between applications, and so on. Any

changes to the original object are automatically reflected in the document where it is embedded.

outdoor locations

Areas exposed to the elements. Viewing distances are generally longer.

PCB

Printed Circuit Board. The card type material of which micro boards and driver boards are made.

PING

Packet Internet Grouper. A program used to test the reachability of destinations by sending an Internet

Control Message Protocol (ICMP) echo request and waiting for a reply.

pitch

The distance from the center of one pixel to the center of the next adjacent pixel. Also known as center-to-

center spacing.

pixel

Picture element. The smallest element or spot that a screen or sign can display.

pixel diameter

Determines the size of a pixel. A pixel can be as small as a single .1" diameter LED.

PLC

Programmable Logic Controller. Used in industrial environments to continually turn off various devices

without fail using programmed logic (for example, traffic lights).

Part Number. A unique number assigned to each product, document, brochure, and so on, and to many

components.

polling

Any procedure that sequentially and periodically contacts terminals in a network.

port

a) The hardware that allows a component to communicate with a peripheral, such as a parallel port. b) The

logical point of contact between a LAN driver and a protocol that is bound to it. c) A unique server input/output

address assigned to a local area network driver in NetWare software.

programming

The process of composing messages and graphics, and specifying the display modes, fonts, colors, and

location of text and graphics on the display screen.