Glossary - 4 MC55 Integrator Guide
H
Hard Reset. See Cold Boot.
Hz. Hertz; A unit of frequency equal to one cycle per second.
Host Computer. A computer that serves other terminals in a network, providing such services as computation, database
access, supervisory programs and network control.
I
IEC. International Electrotechnical Commission. This international agency regulates laser safety by specifying various laser
operation classes based on power output during operation.
IEC (825) Class 1. This is the lowest power IEC laser classification. Conformity is ensured through a software restriction of
120 seconds of laser operation within any 1000 second window and an automatic laser shutdown if the scanner's
oscillating mirror fails.
IEEE Address. See MAC Address.
Input/Output Ports. I/O ports are primarily dedicated to passing information into or out of the terminal’s memory. MC55
mobile computers include USB ports.
Interleaved 2 of 5. A binary bar code symbology representing character pairs in groups of five bars and five interleaved
spaces. Interleaving provides for greater information density. The location of wide elements (bar/spaces) within each
group determines which characters are encoded. This continuous code type uses no intercharacter spaces. Only
numeric (0 to 9) and START/STOP characters may be encoded.
Internet Protocol Address. See IP.
I/O Ports. The connection between two devices, defined by common physical characteristics, signal characteristics, and
signal meanings. Types of interfaces include RS-232 and USB.
IP. Internet Protocol. The IP part of the TCP/IP communications protocol. IP implements the network layer (layer 3) of the
protocol, which contains a network address and is used to route a message to a different network or subnetwork. IP
accepts “packets” from the layer 4 transport protocol (TCP or UDP), adds its own header to it and delivers a “datagram”
to the layer 2 data link protocol. It may also break the packet into fragments to support the maximum transmission unit
(MTU) of the network.
IP Address. (Internet Protocol address) The address of a computer attached to an IP network. Every client and server
station must have a unique IP address. A 32-bit address used by a computer on a IP network. Client workstations have
either a permanent address or one that is dynamically assigned to them each session. IP addresses are written as four
sets of numbers separated by periods; for example, 204.171.64.2.
IPX/SPX. Internet Package Exchange/Sequential Packet Exchange. A communications protocol for Novell. IPX is Novell’s
Layer 3 protocol, similar to XNS and IP, and used in NetWare networks. SPX is Novell's version of the Xerox SPP
protocol.
ISM. Industry Scientific and Medical
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