A5 5A 06 83 00 01 01 00 01 This is an incorrect instruction, usually due to a level mismatch between 232 and TTL. The correct one should be
53 54 3C …..
ST<{“cmd_code”:”set_image”,”type”:”image”,”widget”:”image36″,”image”:light_red}>ET This is the instruction sent to the HMI is JSON, and the instruction returned by the HMI is in hexadecimal, as described in the manual