Patent ID: 7626935

Claim:
A data bus system arranged to convey messages between originating and client device connected to a data bus and which employs a message protocol that requires each message conveyed between a client device and an originating device to include a frame check sequence (FCS) comprising: A data bus for conveying message between devices connected to said data bus; An originating device connected to said data bus and arranged to initiate data bus transactions with other devices connected to said data bus; and At least one client device connected to said data bus and arranged to automatically and atomically include a frame check sequence (FCS) with each message convey between said client device and said originating device; said data bus system arranged when a message to be conveyed to said originating device is not to be client-aborted, the FCS of said message is generated by a first method known to both client and originating devices, said FCS generated by said first method indicating to said originating device whether said conveyed message is ‘good’ or ‘failed’, and when a message to be conveyed to said originating device is to be client-aborted, the FCS of said message is generated by said first method and then modified using a second method, said modified FCS conveyed with said message to said originating device.