Transmission of data packets between two devices in automation system, using check symbol from last data packet received as start value when calculating check symbols for packet to be sent

摘要

Each data packet contains a check symbol from which further data in the data packet are calculated. One device uses the check symbol from the last data packet received from the other device as a start value when calculating the check symbols for the next data packet to be sent to the other device. An independent claim is included for an automation system.