Intermec Transaction Manager 9560, Руководство пользователя

Страница: 291 / 309

Glossary
G-13
G
parity
A system for encoding characters with odd or even bar code patterns. Parity
provides a self-checking feature in bar codes and other data transmission
techniques. Even parity characters have an odd number of binary ones in their
structure. Parity, for the purposes of data processing and data
communications, does not relate to whether the original character is odd or
even, but how an individual character is made odd or even with the addition of
one more bit (1 or 0).
parity bit/bar/module
A parity bit is added to a binary array to make the sum of all of the bits always
odd or always even for a fundamental check.
Point-to-Point protocol
Communications protocol typically used to connect the reader directly to a
computer or terminal. Data sent by the reader is followed by a carriage return
and line feed (CR LF). XON/XOFF is supported. Point-to-Point protocol
characters cannot be modified; however, the transmission parameters, such as
parity and data bits, can be modified.
POL
Poll character
Enables or disables the solicitation event and/or requests data from a polled
device.
Sent by the host to request reader data. For User Defined Multi-Drop protocol,
you must define a unique character for each reader on a data line.
Poll sequence
A controller command to a polled device that tells the device to send data.
polled device
Device in a network that transmits data in response to an initialization from the
controller. If the POL character is not enabled, all Intermec readers and printers
will transmit data when the operating system of the device requires data to be
transmitted.
postamble
Predefined data that is automatically appended to the end of transmitted data.
When a postamble is enabled, you must enter a valid Postamble C before the
reader will send data to the computer. After exiting Prompting Configuration,
the reader will not accept data until a you enter a valid Postamble C.