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Glossary of Terms

The Intermec glossary provides definitions of technical terms used to describe systems, devices, solutions and applications within the Automated Data Capture Industry.

data bits
The number of bits used for data. Generally set at seven or eight. Used in communication protocol. Set according to the host configuration.
data block
A sequence of continuous data character or bytes transmitted as a unit.
data collection device
A device in the data collection system that collects data from bar codes and sends it to the host.
Data Entry mode
The default operating mode for a bar code reader. The reader waits to receive data or commands from a label, keypad, or host.
data file
The collection of data and printer commands that, when sent to the printer, is merged with a format file to print a label.
data line print
A mode of operation in which the printer prints each command (accompanied by its ASCII code) that it receives from the host.
data transmission
An event in which a block of data is transmitted from one device to another.
data transmission event
A communications event where data is transmitted from one device to another.
DCE
Data communication equipment that provides the communication connection function in a computer environment (such as a modem).
DCM
Data Collection Manager. An Intermec connectivity product that lets you set up communications between runtime applications and the data input stations. A variety of communication protocols are supported, including TCP/IP, APPC, and screen mapping.
decoder
Part of a bar code reading system, it is the electronic package that receives the signal from the scanner, performs the algorithm to translate the signal into meaningful data, and provides the interface to other devices.
default configuration
The values set for each configuration parameter when the device is shipped.
default parameters
A set of configuration parameters that are active when the device is shipped.
default router
The IP address of a router that is used when a device sends a packet to another subnet or when a device sends a packet to an unknown destination.
density
The amount of information encoded in a given area. See also bar code density.
depth of field
The distance between a minimum and maximum plane in which a reader can read symbols of a specific dimension.
destination
Either the logical name of a device or the name of an application program's channel. Anyplace where a transaction can be sent.
DevComm
Device communication process. Provides communications between a host and a particular device (readers, printers, controllers, concentrators). There is a DevComm for each attached device per port. In a given installation, there will be one port for each device required, each running a copy of a device DevComm. One module is created (spawned) for each communications port when DCM is initialized.
device
Generic term for any piece of equipment, such as a terminal, a reader, a printer, or a controller.
device address
A type of address that is used by the host to identify a particular data collection device. This address can also refer to the device's physical address.
device driver
A software component that controls an external device. For example, a PC card device driver controls how the reader accesses the PC card.
DFM
Data Flow Manager. The Intermec software product that routes the information from source to destination.
diffuse reflection
The component of light that reflects in all directions from the reflecting surface.
digital
Pertaining to data in the form of digits. In signals, digital refers to a signal that assumes one of a predetermined set of values, such as 0 to 1, as opposed to a signal that may assume any value over a continuing range of values, such as an analog signal.
direct sequencing
A spread spectrum technique by which the transmitted signal is spread over a particular frequency range.
direct thermal
A method of thermal printing in which images are printed when heat from the thermal printhead produces a black mark on the media.
direct-connect
A device that is hard-wired to a port of the host.
dirt
The presence of relatively nonreflective foreign particles embedded in a sheet of paper. The size and lack of reflectance of the particles may be such that they will be mistaken for inked areas by an optical scanner.
discrete code
A bar code symbol in which the intercharacter gap is not part of the code, and is allowed to vary dimensionally within wide tolerance limits. It is the opposite of continuous code.
display
Two-line screen on the control panel that displays messages such as printer status, menus, commands, and errors.
DLE
ASCII Data Link Exception character. It causes the character that follows it to be received as data, even if it is a protocol character. It allows for the use of control characters in preambles, data strings, and configuration command strings.
DLL
Dynamic link library. A subroutine package that is bound to an application at load time or during execution, rather than at link time when the program is created.
domain
The area within a LAN that defines a region administered by a controller or server. The domain is also called a subnetwork.
DOS code pages
A code page is a table that relates binary character codes used by a program to keys on the keypad or to characters on the display. All international keypads are translated using an installed DOS code page that contains the standard ASCII character set and a set of national language characters specific to the language the code page supports.
downline
1. A device that is at the terminal end of a connection to the computer is referred to as being downline. When devices are connected to a computer, they are connected in a line. Downline is a direction relative to the computer. See also upline. 2. If more than one computer is connected in a line, the upline computers usually handle data processing and the downline computers usually handle data collection and sometimes some data preprocessing.
DRAM
Abbreviation for dynamic random access memory. A type of RAM that stores information in integrated circuits containing capacitors. Since capacitors lose their charge over time, DRAM boards include logic to recharge, or "refresh," the RAM chips continuously. Since their internal circuitry is simple, DRAMs are more commonly used than static RAMs, even though they are slower. DRAM can hold approximately four times as much data as a static RAM chip of the same complexity. The reader has 1MB of battery-backed DRAM.
drive
An electromechanical device that reads from and writes to disks. The three types of common disk drives are floppy disk drives, hard disk drives, and PC card drives.
driver
1. A software module that controls an input/output port or external device. 2. Software or firmware that translates operating system requests (such as input/output requests) into a format that is recognizable by specific hardware, such as adapters.
DTE
Data transmission equipment. A computer or terminal that provides data in the form of digital signals at its output.
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