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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.

RL : RD x 100 percent
where RL = reflectivity of the light elements and RD = reflectivity of the dark elements
Radio Independent
A design that supports systems based on 400 MHz UHF< 900 MHz spread spectrum, 2.4 GHz OpenAir, IEEE 802.11 Frequency Hopping, IEEE 802.11 Direct Sequence, and future wireless radio technologies.
RAM
Random access memory. Memory that can be written into, or read, by locating any data address.
RAM drive
A disk drive that exists only in extended memory in your terminal or reader. You create, read, write, and delete files on a RAM drive the same way you can on a hard disk drive. RAM drives are faster than hard disk drives because the contents of a RAM drive are, by definition, always resident in RAM. The contents are destroyed when you cold boot the device.
RARP server
Reverse address resolution protocol server. A device that assigns a physical address in response to a query from an IP node. In this query, the IP node supplies its IP address. The RARP server then checks its tables to determine the corresponding physical address.
raw
An output mode that is selected for RS-232 and RS-422 interfaces. This mode does not use any flow control during communication.
read rate
Ratio of the number of successful reads on the first attempt to the number of attempts.
reader
An input device that reads bar codes, converting the input data to electronic data. Typically consists of a scanner, a decoder, and a data communications interface.
reader command
A reader command causes the terminal or reader to perform a task. You can enter a reader command by typing on the keypad, by scanning a bar code label, by sending a command from another device on the network, or by sending a command from the host.
Reader Services
A collection of programs on the reader that decode bar codes, process data input and output, configure the reader, and handle power management.
reader-to-reader
A method of communicating between two JANUS readers. By placing two readers so the receive signal on one reader aligns with the transmit signal on the other reader, and the transmit signal on the first reader aligns with the receive signal on the other reader, you can achieve direct communications between the two readers. For this type of communications, the readers should be no more than 1 inch apart.
ready
The state in which the printer is able to print; the normal operating state of the printer.
Ready/Busy Line
Pin 11 of the rear panel connector. Indicates the printer is ready or not ready.
real-time
The immediate availability of data to an information system as a transaction or event occurs.
records per block
The maximum number of data records transmitted per block of data. A block of data is transmitted during a single transmission event.
recovery
When you access the audit file (DCMAUD.DAT,) the data are time-stamped and processed just as if they were being currently collected.
reflectance
The ratio of the amount of light of a specified wavelength or series of wavelengths reflected from a test surface to the amount of light reflected from a barium oxide or magnesium oxide standard under similar illumination conditions.
region
In screen mapping, a particular area on a screen that can be used to display messages and error conditions. Also referred to as the significant region.
region message
In screen mapping, a user-defined string that is sent to the source of the transaction when the region is not detected.
regular symbol
Refers to a bar code label that takes the form . Regular symbols are transmitted as soon as scanned. See also multiple-read symbol.
remark out
When you add a REM statement (short for REMark) at the beginning of a command line in a batch file, DOS treats the line as a remark instead of as a command. Any statement beginning with the characters REM will be ignored by the command processor. Typically, users will remark out device drivers in AUTOEXEC.BAT and CONFIG.SYS startup files.
remote
When DCM and application programs are installed on physically different computers, one is remote to the other. It is usually the application program that is referred to as remote.
repeat hop
Also called repeat count. An action whereby a message is received and then transmitted by a repeater. It is recommended that no more than two repeat hops are used per message.
repeater
The repeater extends coverage of the RFDC system by functioning as a message store and forward device.
REQ
Request for acknowledgment character. Sent by the reader to the host to request a retransmission of an acknowledgment to a reader message.
requester
A program that starts up a conversation with a remote partner program. A send requester then sends data to that partner program. A receive requester then receives data from that partner program.
RES
Reset character. Sent by the reader to end communication with the host. The RES character enables or disables the reset event, or resets the data transmission event to the solicitation event.
reset event
Terminates the current data transmission event and resets the communication event to the solicitation event. To enable the reset event, define RES to be other than NULL.
resolution
In a bar code system, the narrowest element dimension that can be distinguished or printed by a particular device.
resume
When you turn the terminal or reader on, the terminal or reader either resumes exactly where it was when you turned it off, or it boots and restarts your application.
retry count
When handshake event is enabled, the retry count is set to three. The polled device decrements the retry count every time the NEG is transmitted. The controller decrements its retry count every time the REQ is transmitted. The reset event occurs when the retry count equals zero.
retry limit
The maximum number of times the controller will try to transmit to a particular device before it changes the device's status to unreachable. After the retry limit is reached, the controller continue to transmit to the device, but at a slower rate.
RF
Radio frequency. A frequency at which coherent electromagnetic radiation of energy is useful for communications purposes.
RF data collection system
Radio frequency data collection system in which the individual components communicate with each other by radio signals. Abbreviated as RFDC system.
RFNC address
Radio frequency network controller's address. This address is used by the devices to communicate with the BRUs attached to the controller.
RFPH
The RF protocol handler, which enables a JANUS 2010 reader with an RF Back to communicate as an end device in an RF network. RFPH lets the reader transmit and receive data as specified by the RF communications protocol.
ribbon cable
A cable made of normal, round insulated wires arranged side by side and fastened together by a cohesion process to form a flexible ribbon.
ribbon save
An optional device for the printer that disengages the thermal transfer ribbon while labels are being fed forward, or any other time printing does not take place.
riser
A board with expansion slots that is designed to connect to the main PCB and holds additional PCBs or ISA cards.
roaming
Movement of a wireless node between two microcells. Roaming usually occurs in infrastructure networks built around multiple access points.
rolled-over memory
A type of dynamic random access memory (DRAM). The JANUS 1MB reader has 1MB of battery-backed DRAM. From the memory existing between the 640K and 1MB boundaries, 384K is remapped or "rolled-over" above 1MB to create the RAM drive. If you do not need the RAM drive, you can access rolled-over memory as extended memory through a device driver or an application that uses HIMEM.SYS.
ROM
Read only memory. Usually a small memory that contains often-used instructions, such as microprograms or system software. ROM is programmed during memory fabrication and cannot be reprogrammed.
ROM drive
A read-only memory drive. Drives C and D are ROM drives implemented in flash memory on the reader.
router
A software and hardware connection between two or more networks that permits traffic to be routed from one network to another on the basis of the intended destinations of that traffic.
routing
Assigning a path for message or file delivery. DCM routes messages and files.
RS-232
Widely recognized protocol standard for serial binary data interchange. The standard covers the physical, electrical, and functional characteristics of the interface. RS-232 is the standard American format for serial data transmission by cable (that is, from a computer terminal to a modem). RS-232 transmission uses a distinctive 25-pin connector, although in most cases not all of the conductors are used. See serial.
RS-422
Standard for the voltage and impedance levels for serial data transmission on balanced lines. Similar to RS-232, but handles larger distances and faster communication.
RS-485
Standard for allowing multiple devices to share a common set of serial data communication lines. The signaling is very similar to RS-422. The maximum number of devices allowed is 32.
RTV
Room temperature vulcanizer. RTV is a silicone glue used to secure connections.
RUN
Compile and run IRL program character. Sent by the host to indicate the end of a downloaded program. Causes the reader to compile the program. If the program compiles correctly, the reader runs the program.
RX EOM1
Receive end of message first character. Enables or disables receiving data and/or indicates the end of a data block in the receive data event. Older Intermec products may not include these protocol characters. Newer generation online reader products implement these protocol acronyms.
RX EOM2
Receive end of message second character. Enables or disables the second character of the RX EOM and indicates the end of a data block in the receive data event. Older Intermec products may not include these protocol characters. Newer generation online reader products implement these protocol acronyms.
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