From C to D

cabled scanner
A wand, laser scanner, or other device that scans bar code information. A cabled scanner is connected to a bar code reader or terminal with a cable rather than being built into (integrated in) the reader or terminal.

camera window
A window located at the front end of the 7350 optical head, through which the camera views objects on the conveyor.

CCD scanner
Charge-coupled device scanner. A CCD scanner contains no moving parts and uses a light source to illuminate the entire symbol. A symbol is scanned electronically using the digitized image of a line through the symbol provided by the linear photodiode array.

1. A place in RAM to deposit transactions when sending from one process to another process in a multitasking environment. A waiting place for data (mailbox). 2. The path for transmitting data from a device to the host. In RF networks, it is the frequency hopping sequence the card follows. The 2.4 GHz bandwidth can be divided into 15 different channels.

channel search
A method by which a device maintains its ability to transmit data by searching for an open RF frequency when its current frequency is unavailable.

1. A single group of bars and spaces that represent an individual number, letter, punctuation mark, or other symbol. 2. A graphic shape representing a letter, numeral, or symbol. 3. A letter, digit, or other symbol that is used as part of the organization, control, or representation of data.

character alignment
The vertical or horizontal position of characters with respect to a given set of reference lines.

character density
In a linear bar code symbol, the number of data characters per unit length (typically, per inch). For a discrete symbology, the character width must include the intercharacter gap.

character set
The characters that are available to be encoded in a particular automatic identification technology.

check character
A character included in a message for the purpose of performing a mathematical check to ensure the accuracy of the message.

check digit
A character included in a bar code for the purpose of performing a mathematical check on the value of the decoded bar code to ensure its accuracy.

A calculated value that is used to test data integrity. Errors can occur when data is transmitted or when it is written to disk. One means of detecting such errors is the use of a checksum. A value is calculated for a given chunk of data by sequentially combining all the bytes of data with a series of arithmetic or logical operations. After the data is transmitted or stored, a new checksum is calculated and compared with the original one. If the checksums match, the transmission or storage was probably error free. If they do not match, an error occurred.

Console Interface Program. The software interface that lets the user interact with the DCM kernel to view performance statistics or alter the configuration or operation of the DCM system.

clear area
See quiet zone.

The computer from which you will access drives, directories, files, and programs that are stored on the server. See also server.

client host
If DCM and the application program software are installed on physically different computers, the application programs computer is called the client host. See also server.

A procedure that copies the RAM contents (configuration, formats, fonts, pages, and graphics) from the memory of one printer to the memory of another.

Complementary metal-oxide semiconductor. A type of integrated circuit noted for its extremely low power consumption.

A type of cable used to connect the controller directly to an IBM host. Coaxial cable consists of an outer layer of insulation, an outer conductor, another insulating layer, and a central conductor. See also twinaxial.

A self-checking, discrete bar code symbology that has these 16 characters in its set: 0 to 9, dollar sign ($), colon (:), slash (/), period (.), plus (+), and minus (-). Codabar is commonly used in libraries, blood banks, and air-parcel express applications. The American Blood Commission (ABC) Codabar requires that you retain the start/stop code digits when processing a Codabar symbol. The maximum density for a Codabar symbol is 12.8 characters per inch.

See bar code.

Code 11
A high density, discrete, numeric bar code developed by Intermec. The character set includes the numbers 0 through 9 and the dash character (-). Each character is represented by a standalone group of three bars with two included spaces. This code is not self-checking. One or two check digits provide data security. Code 11 is widely used in labeling telecommunications equipment. Its maximum density is 15 characters per inch.

Code 128
A variable length, continuous, and weakly self-checking bar code developed by Computer Identics. It requires loose printing tolerances. It supports the extended ASCII character set. Its high density makes it useful when printing data in a limited space. The character set includes all 128 ASCII characters. Each character is represented by 11 modules and four bar widths. Its maximum density is 12.1 alphanumeric characters per inch or 24.2 numeric characters per inch.

Code 16K
A two-dimensional (stacked rows) ultra-high density bar code that has loose printing tolerances. Code 16K is based on Code 128 (128 squared is 16,384 or 16K). It requires a check digit. Code 16K is widely used in labeling unit-dose packaging for the health care industry; it is suitable for labeling small objects because it can encode more data in less area than many other codes. The character set includes all 128 ASCII characters.

Code 2 of 5 (2 of 5)
A discrete, self-checking code for encoding numeric data only. The bars encode information and the spaces separate individual bars. It can achieve densities of 15 characters per inch.

Code 39
An alphanumeric bar code symbology that is discrete, variable length, and self-checking. It requires loose printing tolerances. It is used in manufacturing, government agencies, and health care. The character set is A - Z uppercase, 0 - 9, dollar sign ($), period (.), slash (/), percent (%), space ( ), plus, (+), and minus (-). It can be extended to full 128 character ASCII by use of a two-character encoding scheme (see full ASCII). Its maximum density is 9.8 characters per inch.

Code 49
A bar code symbology that is multirow, fixed length, and continuous. It requires loose printing tolerances. It is suitable for labeling small objects because it can encode more data in less area than other codes. The character set is all 128 ASCII characters. Its maximum density is 93.3 alphanumeric characters per inch or 154.3 numeric characters per inch.

Code 93
A bar code symbology that is discrete, variable length, and self-checking. It requires loose printing tolerances. It can be used interchangeably with Code 39 when higher density printing is required. The character set is the same as Code 39: A - Z uppercase, 0 - 9, dollar sign ($), period (.), slash (/), percent (%), space ( ), plus, (+), and minus (-). It can be extended to full 128 character ASCII by use of a four-character encoding scheme (see full ASCII). Its maximum density is 14.8 characters per inch.

Code One
A 2D matrix symbology that is especially useful for applications such as small parts labels that do not provide sufficient space for linear bar codes. In addition to data storage and error correction symbols, each Code One symbol contains a set of horizontal lines in the center, called a finder pattern, that helps readers quickly locate and identify each symbol. Code One symbols also contain vertical reference bars to help readers locate the relative positions of each data bit.

cold boot
One of two ways to boot the reader; compare to warm boot. A cold boot invokes the BIOS boot sequence, which verifies that the 256K flash system image is not corrupt, clears all memory, and performs a complete power-on self test (POST) to ensure that the hardware and peripherals are operational. The cold boot initializes the system hardware for use by system software, loads the default configuration, runs AUTOEXEC.BAT and CONFIG.SYS, and loads DOS. Because the physical RAM drive is initialized, all files on drive E are lost. You may cold boot the reader to clear the reader's conventional memory, break out of an application that is locked in an infinite loop, or recover from an error condition.

COM port
Commonly used short form of communications port. COM ports offer serial communications, which means that data is transmitted one bit at a time over a single line from one computer to another.

Communications Manager
An application on the reader that lets you transmit and receive files, and see the status of the reader's COM port. This application is available on the Application companion disk 3.

communications protocol
A set of rules or standards designed to enable computers to connect with each other and exchange data. An example of a communications protocol is Point-to-Point protocol.

Communications Utilities
Transmit and receive functions that you can call with PSK functions or software interrupts. Included in the Reader Services programs.

Compound Function key
The Compound Function key is a special key on the JANUS keypad. You use the f key to access characters or perform functions that do not have an actual key on the keypad. When you press fw, the key is held in a buffer and the Compound Function key icon appears on the reader's display. Once you press a key other than fw, the key combination is entered into the reader and the icon disappears from the display.

concatenated code
A subset of Codabar symbology. Two bar code labels are read as one where the stop code of the first label matches the start code of the second label.

The operation of joining two or more character strings together, end to end.

The selected parameters that determine the operating characteristics of an electronic device.

configuration command
A configuration command changes the way the terminal or reader operates. You can enter a configuration command by typing on the keypad, by scanning a bar code label, or by sending a command from a device on the network.

configuration file
A configuration file is an ASCII text file that contains settings for some or all of the reader's configuration parameters.

Configuration Manager
A Reader Services program on the reader that maintains the reader's current configuration file, ensures that the reader operates according to that configuration, and lets you change the configuration file.

Configuration mode
Mode used to select the parameters of the reader. One of two modes available in the reader.

Configuration and control manager. The software interface that enables the user to interact with the DCM message handler to view performance statistics or alter the configuration or operation of the DCM system.

A terminal or monitor used to configure the 9180 controller and to supervise the RF data collection system.

contact scanner
A scanner that requires physical contact between the code medium and the scanner.

continuous code
A bar code or symbol in which the space between two characters (intercharacter gap) is part of the code, such as USD-1 (Interleaved 2 of 5 Code). A continuous code is the opposite of a discrete code.

Amount of difference in reflectance between the dark bars and the light spaces of a bar code; measured by print contrast signal (PCS).

Control mode
A reader mode you use to temporarily change some of the display parameters at the DOS prompt or when running an application. The parameters are reset when you boot the reader.

control panel
A panel on the printer containing the operating and menu keys, liquid crystal display, and indicator lights.

An electronic device that interfaces between the data collection devices and the host.

conventional memory
The reader has 1MB of battery-backed dynamic RAM. The first 640K is conventional memory and is virtually the same as that of a PC. You can use this memory to run applications.

Cyclic redundancy check. The CRC is a data block check used to enhance data integrity. A CRC calculation is performed on the contents of each received RF message. If the result of this calculation compares with the received CRC, then the message was received without error.

Intermec proprietary data collection network consisting of a 9161 port concentrator or a 9154 controller, data collection devices, printers, and input devices.

Computer response required mode. An operating parameter that, when enabled, requires the reader to await a response from the host before sending more data. The response from the host is transmitted using the selected protocol.

Carrier sense multiple access/collision avoidance. CSMA/CA is a protocol that allows each node to sense whether or not a channel is in use before attempting to transmit information. CA is an algorithm by which channel time is reserved to avoid collisions.

Carrier sense multiple access/collision detection. CSMA/CD is a protocol that allows each node to sense whether or not a channel is in use before attempting to transmit information. If it detects no other carrier, it transmits. If a collision is detected, the device stops transmitting, waits a random length of time, and begins transmitting again.

Clear to send. Used in communications protocol to verify a ready state.

Clear to send/ready to send. A type of hardware flow control. The reader or terminal signals the serial port device when ready to receive data (CTS). The reader or device checks with the serial port device when ready to send data (RTS).

current screen
The current screen in screen mapping refers to the host screen you are currently defining. You must select a current screen before you can define host screen fields, regions, and messages.

current transaction
The current transaction in screen mapping refers to the transaction for which you are currently defining script. The current transaction may send data to different host screens. You must select a current transaction before you can define host screens, host screen fields, regions, and messages.

cursor keypad
A set of keys on the reader that allows you to move the cursor around the screen.

An optional device for the printer that cuts individual labels and drops them into a tray.

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.

Data communication equipment that provides the communication connection function in a computer environment (such as a modem).

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.

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.

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.

Either the logical name of a device or the name of an application program's channel. Anyplace where a transaction can be sent.

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.

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.

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.

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.

A device that is hard-wired to a port of the host.

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.

Two-line screen on the control panel that displays messages such as printer status, menus, commands, and errors.

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.

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.

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.

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.

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.

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.

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.

Data transmission equipment. A computer or terminal that provides data in the form of digital signals at its output.