Glossary - Siemens SINAUT MD720-3 System Manual

Glossary

GSM
Global System for
Mobile
Communication
CSD
Circuit Switched Data
GPRS
General Packet Radio
Service
OPC
Protocol, transmission
protocol
COM-Port
SINAUT MD720-3
C79000-G8976-C211
Global standard for wireless telephony, data and fax transmission and
transmission of text messages (SMS). GSM based networks are
available in a lot of countries world-wide, with high coverage in Europe,
China, Latin America as well as in regions of the USA, Africa and
Russia. Depending on the used frequencies you distinguish PCS
850MHz, GSM 900MHz, DCS 1800MHz und PCS 1900MHz networks.
GSM Service for wireless data transmission at 9600 bps full duplex.
Connections can be established to other GSM devices, to analogue
modems or to ISDN modems in wired networks. The connections can
be initialized at both sides. Only dial-up connections are supported.
GSM service for IP-based data transmission. Over GPRS network
connections are established, either to the internet or to private
networks.. Data are transmitted using the internet protocols TCP/IP or
UDP/IP.
OPC covers a series of specification for data exchange in automation
technologies between control devices, sensors etc. and control
systems (see www.opcfoundation.org).
Devices which communicate with one another must use the same rules
for this communication. They must "speak the same language". Such
rules and standards are collectively referred to as a protocol or
transmission protocol. Often used protocols are, for example, TCP/IP
and PPP.
The term "COM port" (communications port) is used to describe a serial
interface (RS232) on a Windows PC. Application programs use COM
ports for data transmission to various devices such as modems, PCs,
terminals etc.
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