Technical data

Glossary
SINAUT MD720-3
C79000-G8900-C210
61
ICMP is based upon IP and transmits control messages.
SMTP is based upon IP and is an E-mail protocol.
IKE is based upon UDP and is an IPsec protocol.
ESP is based upon IP and is an IPsec protocol.
On a Windows PC the WINSOCK.DLL (or WSOCK32.DLL) takes over
the handling of both these protocols.
PPP (Point to Point
Protocol)
Designates a transmission procedure via serial point-to-point
connections for data packets, specially for Internet access via a
modem.
As an Internet standard for serial data communication PPP defines
the way data packets are exchanged with other Internet based
systems via modem connections.
In Windows PPP connections are defined in the Dial-up Network.
Service Provider
A company or institution which provides users with access to the
Internet or an online service.
Protokoll,
Übertragungs-
protokoll
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, IP, TCP,
PPP, HTTP and SMTP. TCP/IP is the major term for all protocols
based upon IP.
COM-Port, virtual
COM-Port
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. A COM port can have a connector (a physical COM port)
or be a software interface in the PC (a virtual COM port). Virtual COM
ports behave in the same way for application programs as physical
COM ports but the data can be rerouted onto other interfaces.
Client / Server
In a client/server environment a server is a program or computer which
receives and answers queries from the client program or client
computer.
In the case of data communication one also uses the term client for the
computer which establishes a connection to a server (or host), i.e. the
client is the calling computer and the server (or host) is the called
computer.
OPC
OPC means Openess, Productivity, Collaboration and contains
specifications for the exchange of data between controls, signal
generators and control systems of the automation technology.