Basic Principles of Serial Data Transmission
2.2 Transmission Procedure with a Point-to-Point Connection
CP 341 Point-to-Point Communication, Installation and Parameter Assignment
Manual, 09/2008, A5E02191071-01 33
2.2 Transmission Procedure with a Point-to-Point Connection
When data is transmitted, all communication partners must adhere to a fixed set of rules for
handling and implementing data traffic. ISO has defined a 7-layer model, which is recognized
as the basis for a worldwide standardization of transmission protocols.
Protocol
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 mode
● Initiative
Specifies which communication partner can initiate the transmission and under what
conditions.
● Control characters
Specifies which control characters are to be used for data transmission
● Character frame
Specifies the character frame to be used for data transmission.
● Data backup
Specifies the data backup procedure to be used
● Character delay time
Specifies the time period within which a character to be received must be arrive.
● Transmission speed
Specifies the baud rate in bits/s
Procedure
This is the specific process according to which the data is transmitted.
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