Extron Electronics IPL T SFI244 - Manual (Page 66)

GlobalViewer (GV) — A set of Web pages (HTML, XML, JS) and graphics that are loaded
into the memory of an IPL T SFI244 unit. These pages provide an interface for control of
devices attached to the IPL T SF unit. They communicate with the event scripts running
on the box, and the event scripts issue the commands and queries. This communication
between the Web pages and the event scripts occurs through predetermined memory
locations in the IPL T SFI244. GV is initially created by GC; however, it is possible to edit
the GV HTML, XML, and JavaScript files outside of Global Configurator. This edited GV is
called “hard-coded” or manually generated GV.
HTTP — An acronym for the HyperText Transfer Protocol (HTTP), a Web protocol based on
TCP/IP, that is used to fetch HyperText objects from remote Web pages.
Hysteresis (deadband) — The lag that exists between the responding parameter and the
changing parameter.
Internet Protocol (IP) — The protocol or standard used to send information from one
computer to another on the Internet.
IP address — A unique, 32-bit binary number (12-digit decimal number, xxx.xxx.xxx.xxx)
that identifies each sender and each receiver of information connected to a LAN, WAN, or
the Internet. IP addresses can be static (see Static IP) or dynamic (see DHCP).
IP Netmask — A 32-bit binary number (12-digit decimal number, xxx.xxx.xxx.xxx) used on
subnets (smaller, local networks) to help the router determine which network traffic gets
routed internally to local computers and which network traffic goes out on the Internet.
Media Access Control (MAC) Address — A unique hardware number given to devices
that connect to the Internet. When your computer or networking device (router, hub,
interface, and so on) is connected to the Internet, a table (see ARP) relates the device’s IP
address to its corresponding physical (MAC) address on the LAN.
Pass-through — Allows control systems to work with the IPL T SFI244 unit and provides a
link between two ports.
Ping — A utility that tests network connections. It is used to determine if the host has an
operating connection and is able to exchange information with another host.
Port number — A preassigned address within a server that provides a direct route from
the application to the Transport layer or from the Transport layer to the application of a
TCP/IP system.
Static IP — Refers to an IP address that has been specifically (instead of dynamically — see
DHCP) assigned to a device or system in a network configuration. This type of address
requires manual configuration of the actual network device or system and can only be
changed manually or by enabling DHCP.
Transmission Control Protocol/Internet Protocol (TCP/IP) — The communication
protocol (language) of the Internet. Computers and devices with direct access to the
Internet are provided with a copy of the TCP/IP program to allow them to send and receive
information in an understandable form.
Telnet — A utility available on most PCs that allows the computer system to communicate
with one of its remote users/clients. A user who wishes to access a remote system initiates
a Telnet session, using the address of the remote client. The user may be prompted to
provide a user name and password if the client is set up to require them.
IPL T SFI244 • Glossary 60