Figure 1.2. Interconnection of systems and equipment to control and monitor docking of the Soyuz craft and the Salyut station. 1. orbital station control system; 2. station automatic control block; 3. electrical supply system; 4. cosmonaut's panel; 5. docking control block; 6. spacecraft automatic control block; 7. spacecraft control system; 8. command radio line; 9. radio telemetry line; 10. voice communications line; 11. Flight Control Center; 12. Earth-based measuring point. the cosmonaut's panel. Electrical signals from the program instrument are also used to control the main mechanisms during normal operation, and are back-ups in case of failures in the system and for sending the appropriate signals to the cosmonaut's panel. Tn general, both docked spacecraft have docking control blocks. Tn the interaction with different systems these blocks are used to control mechanisms of the active and passive docking assemblies. When the electrical junctions of the joint are automatically connected it is possible to control individual mechanisms of the docking assembly of one spacecraft from the other. Thus, in the docking of the Soyuz spacecraft, after the junctions are connected, the cosmonauts may issue commands to open and close the locks of the docking frame from the passive assembly of the Salyut station. These junctions are also used for communication between the interacting crews during docking.
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