Manual VIPA CPU 21x Chapter 4 Deployment of the CPU 21x-2BT10 with TCP/IP
HB103E - Rev. 05/45 4-7
Protocols
Protocols define a set of instructions or standards that enable computer to
establish communication connections and exchange information as error
free as possible.
A commonly established protocol for the standardization of the complete
computer communication is the so called ISO/OSI layer model, a model
based upon seven layers with rules for the usage of hardware and software
(see ISO/OSI reference model above).
The CPU 21xNET from VIPA uses the following protocols
• TCP/IP
• UDP
• RFC1006 (ISO-ON-TCP)
The protocols are described in the following:
TCP/IP protocols are available on all major systems. At the bottom end this
applies to simple PCs, through to the typical mini-computer up to
mainframes.
For the wide spread of internet accesses and connections, TCP/IP is often
used to assemble heterogeneous system pools.
TCP/IP, standing for Transmission Control Protocol and Internet Protocol,
collects a various range of protocols and functions.
TCP and IP are only two of the protocols required for the assembly of a
complete architecture. The application layer provides programs like "FTP"
and "Telnet" for the PC.
The application layer of the Ethernet part of the CPU 21xNET is defined
with the user application using the standard handling blocks.
These user applications use the transport layer with the protocols TCP and
UDP for the data transfer which themselves communicate via the IP
protocol with the internet layer.
Overview
TCP/IP
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