User`s guide

Glossary
136  Digi Connect Family User’s Guide
File Transfer Protocol (FTP)
A standard Internet protocol that specifies the simplest way to exchange files between
computers on the Internet.
FTP
See File Transfer Protocol.
General Purpose I/O (GPIO)
On Digi Connect devices, pins that are used for serial communications. In normal
operation, the GPIO pins are used for the serial CTS, DCD, DSR, DTR, and RTS. For
Digi Connect EM and Wi-EM devices, there are GPIO pins for the TXD and RXD
signals. GPIO pins can be configured for different purposes, and alarms can be
configured to alert users of a change in GPIO pin state.
GPIO
See General Purpose I/O.
GSM
GSM (Global System for Mobile communication) is a digital mobile telephone system
that digitizes and compresses data, then sends it down a channel with two other streams
of user data, each in its own time slot. It operates at either the 900 MHz or 1800 MHz
frequency band.
GSM together with other technologies is part of an evolution of wireless mobile
telemmunication that includes High-Speed Circuit-Switched Data (HCSD), General
Packet Radio System (GPRS), Enhanced Data GSM Environment (EDGE), and
Universal Mobile Telecommunications Service (UMTS).
HTTP
See HyperText Transfer Protocol.
HTTPS
See HyperText Transfer Protocol over Secure Socket Layer.
HyperText Transfer Protocol (HTTP)
An application protocol in the TCP/IP suite that defines the rules for transferring files
(text, graphic images, sound, video, and other multimedia files) on the World Wide
Web (WWW).
Hypertext Transfer Protocol over Secure Socket Layer (HTTPS)
A secure message-oriented communications protocol designed for use in conjunction