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JANUS? 2020 Hand-Held Computer (4MB) - Intermec

JANUS? 2020 Hand-Held Computer (4MB) - Intermec

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Glossary<br />

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UPC/EAN Code<br />

A fixed length, numeric, continuous bar code symbology that uses four<br />

element widths. A reader that is configured to decode EAN bar codes can<br />

decode UPC, but the reverse is not true. UPC code is a subset of EAN code. It is<br />

a numeric, 12-digit bar code symbology used extensively in retail, particularly<br />

the grocery industry. The character set is 0 to 9. Its maximum character density<br />

is 13.8 numeric characters per inch.<br />

upline<br />

A device that is at the computer end of a connection between a computer and a<br />

device is referred to as being upline. When devices are connected to a<br />

computer, they are connected in a “line.” Upline is a direction relative to the<br />

device, in contrast to downline.<br />

upper memory area<br />

The area between the 640K and 1024K. The upper memory area is physically<br />

composed of a 256K flash ROM chip (system flash) and the video memory<br />

chip. Like a PC, this area contains the BIOS and video buffers. On the reader,<br />

the upper memory area also contains PC card memory and ROM DOS.<br />

User-Defined protocol<br />

A custom communications protocol that can be modified to meet specific host<br />

requirements. For example, you can configure User-Defined to act like a<br />

Point-to-Point protocol, except that it requires an LRC and an acknowledgment<br />

from the receiver. You can also define the communications characters such as<br />

SOM, POL, or SEL, or disable these characters by setting them to null.<br />

vertical reading angle<br />

The vertical angle of a reader’s laser scanner to a bar code label. The optimum<br />

vertical reading angle is near 20 degrees.<br />

viewport<br />

A method for viewing a full PC-size screen (25 x 80) with the reader’s 16 x 20<br />

display. You will only see 16 lines and 20 characters of data at one time. Use<br />

the reader’s display as a viewport to move around and see the entire screen.<br />

virtual display<br />

A PC-size screen (25 x 80) accessible through the reader’s smaller display for<br />

applications that need to be PC compatible. You can see 16 rows and 20<br />

characters of the virtual display at one time. By moving the viewport, you use<br />

the reader’s virtual display of 25 lines by 80 characters—the same size as a PC<br />

screen.<br />

G-25

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