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G
LOSSARY
13
Solutions with Vision
Scan
A single pass of the laser beam over the code or a portion of the code. The search for a bar code symbol that is to be optically
recognized.
Scan Area
The area intended to contain a symbol.
Scan Window
The usable length of the scanning beam that may detect the bar codes. The scan window is perpendicular to the depth of field.
Scanner
An electronic device that optically converts printed information into electrical signals. These signals are sent to the decoder logic.
Scanner Orientation
Relationship of the scan head with reference to the bar code’s location on products. The scan head must be set up to insure that
all code bars and spaces are bisected at the same time. Typically, either side read or top read is used for picket fence or ladder
code orientations.
SCSI
The acronym for small computer system interface. An I/O but interface with faster data transmission rates than standard ports.
The user can connect up to seven devices to one SCSI interface.
Self-checking
A bar code or symbol using a checking algorithm which can be independently applied to each character to guard against
undetected errors.
Sensor
A device that detects or measures something and generates a corresponding electrical signal to an input circuit of a
controller.
Serial Port
An I/O port used most often to connect a modem or a mouse to your computer, identifiable by its 9-pin connector.
Serial Transmission
The most common transmission mode; serial, information bits are sent sequentially on a single data channel.
Serial Asynchronous Transmission Of Data
The following are common communications interfaces: RS232, RS422, RS485, 20mA current loop and RS423.
When data is transmitted serially from a communications port, the information is transferred between the two devices one data bit
at a time. The data flow can follow one of three different communications modes: simplex, half duplex, or full duplex. Each
character of data within the data flow is transported in a binary bit frame called the asynchronous data frame.
The start bit begins each frame. A low voltage signal on the data communications line marks the beginning of the start bit, at
which point the receiving device begins looking for binary zeros and ones (0’s and 1’s).The following five to eight data bits (the
number depends on the format used) comprise the binary character. For error detection, an optional parity bit can define whether
the total number of zeros or ones was even or odd. There are five different parity selections as shown below:
ODD
last data bit is a logical 0 if the total number of logical 1’s in the first seven data bits is odd.
EVEN
last data bit is a logical 0 if the total number of logical 1’s in the first seven data bits is even.
MARK
last data bit is always a logical 1 (i.e.: high/mark).
SPACE
last data bit is always a logical 0 (i.e.: low/space).
OFF (NONE)
last data bit is not present.
The method used to catch errors by using parity bits is as follows: When the transmitter frames a character, it tallies the number
of 0’s and 1’s within the frame and attaches a parity bit. (The parity bit varies according to whether the total is even or odd.) The
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