BECKHOFF C1300 - Manual (Page 7)

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.