Intermec Trakker Antares 2420, User Manual

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Glossary
G-17
G
PDF 417
A two-dimensional stacked symbology. Each row in the symbol includes start/stop
characters, row identifiers, and symbol characters, which consist of four bars and four
spaces each and contain the actual data. PDF 417 provides an extensive error detection
and correction option that can recover up to 510 characters lost due to a damaged label
or to an error in scanning.
peer-to-peer network
A type of LAN whose workstations are capable of being both clients and servers.
PIC
Peripheral interface controller. The PIC processor is an internal processor that manages
the terminal’s batteries.
pixel
Pixel element. One spot in a rectilinear grid of thousands of such spots that are
individually “painted” to form an image produced on the screen by a computer or on
paper by a printer. A pixel is the smallest element that display software can manipulate in
creating letters, numbers, or graphics.
Plessey code
A fixed length, continuous, and non self-checking bar code symbology. Plessey code is
pulse-width modulated. It includes a start character, data characters, an eight-bit cyclic
check digit, a termination bar, and usually a reverse start character. Similar to “MSI
code.”
Poll
Poll character. Sent by the host to request terminal data.
port
For hardware, a connecting component that allows a microprocessor to communicate
with a peripheral device. For software, a memory address that identifies the physical
circuit used to transfer information between a microprocessor and a peripheral device.
POST
Power-on self test. This test runs when you boot the terminal. The test ensures that the
terminal’s hardware and peripherals are operational.
postamble
A field of data that is sent after the data in a message. It is typically used to tag
transactions from the bar code reader or terminal for rapid processing by the host, and it
expands the data field (record) length. Similar to the “preamble.”