Patent ID: 8887022

Claim:
A data transmission system comprising: a sender that is configured to send data frames to at least one transmission line, wherein the sender comprises a sender check sum calculation unit configured to calculate a sender check sum based on the data frames sent to the at least one transmission line, wherein the calculated sender check sum is continuously updated each time a data frame is sent to the at least one transmission line, and wherein the calculated sender check sum depends on all data frames that have been sent to the at least one transmission line after a reset of the sender check sum calculation unit; a recipient that is configured to receive the data frames from the at least one transmission line, wherein the sender and the recipient are both configured to determine a check sum based on a plurality of corresponding data frames that are sent to and, respectively, received from the at least one transmission line, wherein the recipient comprises a recipient check sum calculation unit configured to calculate a recipient check sum based on the data frames received from the at least one transmission line, wherein the calculated recipient check sum is continuously updated each time a data frame is received, and wherein the calculated recipient check sum depends on all data frames that have been received after a reset of the recipient check sum calculation unit; a check sum comparing unit configured to receive and to compare the sender check sum determined by the sender and the corresponding recipient check sum determined by the recipient, the check sum comparing unit being further configured to signal a transmission error or initiate a safety function when the sender check sum is not equal to the recipient check sum; a switch coupled to an output of the recipient and coupled to be activated upon receipt of a signal; and a safety circuit coupled to the check sum comparing unit, wherein the safety circuit is configured to transmit a deactivation signal configured to prevent the switch from conducting a ON current if the check sums compared are not equal.