We intercepted a communication from a Modbus master to a slave on the RS485 bus as given below. Your goal, is to craft a response packet as the slave with 73(decimal) as slave data.

Master requirements are 05-02-00-00-00-01-85-BD.

Flag format: flag{XX-XX-XX-XX-XX-XX} or flag{XX-XX-XX-XX-XX-XX-XX}

flag: 05300100497B3B

flag{05-02-01-00-49-9D-28}

and many tries but the response is false