On-board system and detector hub

A detector hub comprising:

• a detector connection portion connected with a plurality of detectors provided to a vehicle in an intercommunicatable manner;
• a controller connection portion connected with a controller in an intercommunicatable manner, the controller being configured to control an on-board instrument mounted on the vehicle based on detection information indicating a result of detection by each of the detectors;
• and
• a communication processing unit configured to collect the detection information obtained by the detectors and transmit the collected detection information to the controller, wherein
• the on-board instrument and the controller are connected in an intercommunicatable manner through a first network,
• the detectors and the detector connection portion, the controller connection portion and the controller are connected in an intercommunicatable manner through a second network independent from the first network,
• the first network connects the on-board instrument and the controller through a protocol conversion unit configured to perform protocol conversion in an intercommunicatable manner by a plurality of protocols different from each other, and
• the second network connects the detectors and the detector connection portion, the controller connection portion and the controller in an intercommunicatable manner by a single protocol without the protocol conversion unit.