TECHNOLOGY FOCUS - MECHANICAL ENGINEERING - Preferred Component: The control unit comprises a user interface for receiving user input data, and a data processor configured by a control program to determine the control instructions based on the user input data. The operating indicators comprise hydrogen supply pressure indicator(s) for indicating a hydrogen supply pressure that is suppliable to the hydrogen-receiving units. The hydrogen supply pressure indicator comprises a hydrogen source pressure indicator for indicating a hydrogen source pressure. The hydrogen-receiving unit(s) is a fuel cell power module, a refueler for dispensing hydrogen, or a storage unit (70) for storing hydrogen. The receiving unit instruction(s) comprises a fuel cell power module control instruction for controlling the fuel cell power module, or a refueler control instruction for controlling the refueler. The user interface comprises a fuel cell power module indicator for selecting the fuel cell power module, a refueler indicator for selecting the refueler, an associated indicator for selecting the hydrogen-receiving unit. The control program is operable to determine the fuel cell power module control instruction based on whether the fuel cell power module has been selected. It is operable to determine the refueler control instruction based on whether the refueler has been selected. The data processor configured by the control program is operable to disable the fuel cell power module indicator such that the fuel cell power module indicator cannot be selected if the hydrogen supply pressure is below a fuel cell power module threshold pressure; and to disable the refueler indicator such that the refueler indicator cannot be selected if the hydrogen supply pressure is below a refueler threshold pressure. The hydrogen source is a hydrogen generation unit for generating hydrogen. The storage unit has an associated pressure sensor for measuring a storage pressure. The receiving unit operating conditions includes the storage pressure measured by the associated pressure sensor. The hydrogen supply pressure is determined, in part, based on the storage pressure. The storage unit further comprises storage modules for storing hydrogen at different pressures. The control program is operable to selectably distribute hydrogen stored at different pressures in the storage modules to a receiving unit based on a receiving unit operating condition. The receiving unit instruction comprises an associated receiving unit control instruction for controlling the hydrogen-receiving unit. The control program is operable to determine the associated control instruction based on whether the associated indicator has been selected. The hydrogen-receiving unit having the associated indicator has a minimum supply pressure. The data processor configured by the control program is operable to disable the associated indicator if the hydrogen supply pressure is below the minimum supply pressure.