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BECKHOFF C1300 User Manual

Page 7

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C1300 VME to II/O Interface Unit

Beckhoff II/O-System

Date : 18.12.95

Version : 2.01

Page 7 of 44

A telegram consists of a frame and the contents.

picture 2: Telegram structure of the II/O-System

The frame is needed for serial and asynchronous data communications. There is a single start
bit, 6 CRC check bits and 2 stop bits. The frame is created and checked by the hardware, so
that there is no need for additonal software support.