What is the MARK point identification signal machine code of KM-ASSYM3-06 used for in your application?

What does the specific error code 82 indicate in this case?

What type of communication protocol is being used to transmit the MARK point identification signal?
The M7081-PLC timed out waiting for the host computer to transmit the MARK point identification signal error usually occurs when the PLC is unable to receive or interpret the signal from the host computer within the specified time limit.