Train communication system and vehicle-mounted device

A train communication system that performs communication between a vehicle-mounted device and a vehicle information controller, the train communication system comprising:

• one or a plurality of the vehicle-mounted devices to convert a signal to the vehicle information controller into a signal in a network transmission format that is a format used for transmission over a network connectable by the plurality of the vehicle-mounted devices and transmit the signal via the network, and to convert a signal in the network transmission format received from the vehicle information controller via the network into a signal in an original format;
• and
• the vehicle information controller to convert a signal to the vehicle-mounted device into a signal in the network transmission format and transmit the signal via the network, and to convert a signal in the network transmission format received from the vehicle-mounted device via the network into a signal in an original format,
• wherein the vehicle-mounted device comprises:
• an operator to output a signal generated by a function of the vehicle-mounted device in which the operator is included, and to operate based on a signal input from the vehicle information controller;
• a serial/parallel converter to convert a signal generated by the operator into a serial signal and output the serial signal, and to convert a signal from the vehicle information controller into a parallel signal and output the parallel signal to the operator;
• and
• a device-side signal converter to convert the serial signal input from the serial/parallel converter into a signal in the network transmission format, and to convert a signal received from the vehicle information controller via the network into a signal in an original format and output the signal to the serial/parallel converter.