Basic Principles of Serial Data Transmission
2.2 Transmission Procedure with a Point-to-Point Connection
Point-to-point connection CP 440 Installation and Parameter Assignment
Manual, 09/2007, A5E00057742-03
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2.2 Transmission Procedure with a Point-to-Point Connection
Introduction
When data are transmitted, all communication partners must adhere to a fixed set of rules for
handling and implementing data traffic. The ISO has defined a 7-layer model, which is
recognized as the basis for a worldwide standardization of transmission protocols for
computer-to-computer communication.
ISO 7-Layer Reference Model for Data Transmission
All communication partners must adhere to a fixed set of rules for handling and implementing
data traffic. Such rules are called protocols.
A protocol defines the following:
● Operating mode
Half-duplex or full-duplex operation
● Initiative
Which communication partners can initiate data transmission and under what conditions
● Control characters
Which control characters are to be used for data transmission
● Character frame
Which character frame is to be used for data transmission
● Data backup
The data backup procedure to be used
● Character delay time
The time period within which an incoming character must be received
● Transmission speed
The baud rate in bits/s
Procedure
This is the specific process according to which the data is transmitted.
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