Foreword Introduction 1 Scope 2 Normative references 3 Terms and abbreviations 3.1 Terms 3.2 Abbreviations 4 Interface description 5 VOBC-ZC message specification 5.1 Interface connection mode 5.2 Communication architecture 5.3 Interface data description 5.4 Application information definition 5.5 Description of turnback process 6 VOBC-ATS message specification 6.1 Interface connection mode 6.2 Communication architecture 6.3 Interface data description 7 VOBC-CI message specification 7.1 Interface connection mode 7.2 Communication architecture 7.3 Interface data description Annex A (Informative) Example of ATO control command frame sending updating time A.1 Scenarios A.2 ATO control command frame sending updating time