Chapter 5 Communication protocols
Manual VIPA System 300S SPEED7
5-2
HB140E - CP - RE_341-2CH71 - Rev. 09/46
Overview
The simplest type of information exchange between two stations is the
point-to-point link. Here the CP serves as interface for the CPU and a
communication station.
The data are serially transferred. During the serial data transfer the
individual bits of one byte of an information are transferred after another in
a fixed order.
At bi-directional data transfer it is differentiated between
full duplex
and
half
duplex
operation. At
half duplex
operation at one time data may be sent or
received. A simultaneous data exchange is only possible at
full duplex
operation.
Each character to be transferred is preceded by a synchronizing pulse as
start bit
. The end of the transferred character is formed by the
stop bit
.
Beside the start and stop bit there are further parameterizable agreements
between the communication partners necessary for serial data transfer.
This character frame consists of the following elements:
•
Speed (Baudrate)
•
Character and acknowledgement delay time
•
Parity
•
Number of data bits
•
Number of stop bits
The CP serves for an automatic serial data transfer. To do this the CP is
equipped with a driver for the ASCII and STX/ETX protocol. Driver for
further protocols are under construction.
Serial transfer
of a character
Character frame
Protocols
Summary of Contents for CP 341S
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Page 4: ...Contents Manual VIPA System 300S SPEED7 ii HB140E CP RE_341 2CH71 Rev 09 46 ...
Page 8: ...Safety information Manual VIPA System 300S SPEED7 4 HB140E CP RE_341 2CH71 Rev 09 46 ...
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