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This is a normal part of the boot up sequence when there is no flow computer C program installed. This will happen after a cold boot or if the RAM battery has failed and it has lost it's C program.
You will need to connect to the 4202 with RealFLO, install a flow computer and a configuration that has elements setup for the Display Module. The Display Module depends on how the flow computer is configured so if nothing is configured, it won't display anything.