Regarding your question about DiagAlyser, if the software provides functionality for an interactive generator with message simulation, it may be possible to simulate messages with a counter and checksum. To achieve this, you would typically follow steps such as setting up a message template within the software that includes fields for the counter and checksum, and then use the provided tools or scripts to populate these fields according to your simulation needs.
It would be best to refer to the user manual of DiagAlyser or contact the software's support team for detailed instructions specific to your version of the program, as features and capabilities can vary.