From G to H
A LAN product that allows devices on two different subnets to communicate
with each other.
A bitmap picture downloaded to the printer by the host before printing.
One of two display modes on the reader. When the reader is set to
use Graphics mode, you see a 128 x 160 pixel display size. You can
use the reader's CGA display as a viewport to move around and see
a 200 x 640 pixel virtual display. Contrast with Text mode.
A type of address that is used by the host to locate two or more
The bars that are at both ends and at the center of a UPC and EAN
symbol. They provide reference points for scanning, similar to start/stop
Graphical user interface.
A data communication term pertaining to an alternate, one direction
at a time, transmission. See also full duplex.
A scanner held and operated by a human. The scanner is moved to
the object to be scanned, instead of moving the object close to
A communication event that signifies the completion of a data block
transmission. The exchange signifies either an affirmative acknowledge
(AFF) or a negative acknowledge (NEG). The handshake event is enabled
by defining the AFF character to be other than NULL. Some computers
use the characters XON and XOFF as handshaking characters.
Physical equipment, such as mechanical, magnetic, electrical, or
electronic devices. Contrast with software or method of use.
Part of the 7350 Wide Area Bar Code Scanner. Two height sensors,
a transmitter, and a receiver send signals across the conveyor belt.
When these signals are broken by a package, the package's height
can be determined.
A type of laser commonly used in bar code scanners. It emits coherent
red light at a wavelength of 633 nanometers.
Health industry bar code standard. A modified version of Code 39
that has 43 characters, utilizes the Modulus 43 check character,
and reserves some character combinations for special usage.
high memory area
HMA is a 64K block of memory, starting 16 bytes below the 1024K
mark, and is the first 64K of extended memory. Since HMA can only
hold one item, the first program that requests HMA uses it, regardless
of the size of the program.
The viewport's home position is the upper left corner of the TE
or application screen.
See repeat hop.
A bar code or symbol displayed so that its length is parallel to
the horizon. The bars are perpendicular to the horizon.
An application running remotely on a host.
The condition in which the host is processing a request and has
not responded, or has not updated the screen. On a 3270 terminal,
the OIA shows X-SYSTEM, X-CLOCK, or X-. On a 5250 terminal, the
OIA shows II (Input Inhibited).
1. A PC or other computer connected to device. 2. If several computers
are connected together on a network, the controlling computer is
the host. A host can be a desktop, laptop, or notebook PC.
A database that contains a list of remote hosts' IP addresses and
their logical names (aliases) that any device on the network can
hot standby file
If DCM sends a transaction to an application and it does not respond
to DCM within a specified period, the application is consider inactive
by DCM and any transactions for that application are sent to a temporary
file called a hot standby file.
Hot Standby mode
The mode an application is considered to be in by the Model 200
Controller when the controller sends a transaction to an application,
and it does not respond within the time set in the Hot Standby timeout.
Whenever a device tries to send this application a transaction,
the controller can send the device a Hot Standby message. Until
the application becomes active again, any transactions destined
for that application are written to a Hot Standby file. When the
application becomes active, the controller sends it all the transactions
in its Hot Standby file.
A character, number, or symbol printed in a font that can be read
by a human; as opposed to bar code symbology that can only be read
by a machine. See text.