On-board instrument, signal output device, on-board instrument setting system, and signal value information acquisition method

An on-board instrument setting system comprising:

• an on-board instrument comprising:
• a variable terminal group including one or more first terminals each usable as an input terminal or an output terminal and one or more second terminals each usable as an input terminal;
• switching circuitry to switch the first terminals to the input terminal or the output terminal;
• setting circuitry to control the switching circuitry on a basis of an instruction signal indicating the number of first terminals to be used as the output terminal, and if at least one of the first terminals is used as the output terminal, output a first signal to the first terminal that is used as the output terminal via the switching circuitry;
• and
• storage circuitry capable of storing a second signal value and a third signal value, the second signal value being a signal value of a second signal input from the input terminal, the third signal value being a signal value obtained by arraying a plurality of the second signal values on the basis of a first signal value that is a signal value of the first signal, wherein
• the setting circuitry reads the second signal value or the third signal value from the storage circuitry on the basis of the instruction signal, and acquires information on the signal value of the second signal input;
• and
• a signal output device to output a second signal to the on-board instrument, the signal output device comprising:
• signal detection circuitry to detect a first signal output from the on-board instrument;
• signal generation circuitry to determine the number of streams of the second signal to be generated on the basis of the number of streams of the first signal detected by the signal detection circuitry, and generate the second signal for each signal value of the first signal detected by the signal detection circuitry;
• and
• output control circuitry to perform control to output the second signal generated by the signal generation circuitry from a terminal other than the terminal at which the first signal has been detected by the signal detection circuitry.

A signal value information acquisition method for an on-board instrument, the on-board instrument including

• a variable terminal group including one or more first terminals each usable as an input terminal or an output terminal and one or more second terminals each usable as an input terminal,
• the method comprising:
• controlling, on a basis of an instruction signal indicating the number of first terminals to be used as the output terminal, switching circuitry to switch the first terminals to the input terminal or the output terminal, and if at least one of the first terminals is used as the output terminal, outputting a first signal to the first terminal that is used as the output terminal via the switching circuitry;
• storing, a second signal value and a third signal value in storage circuitry, the second signal value being a signal value of a second signal input from the input terminal, the third signal value being a signal value obtained by arraying a plurality of the second signal values on the basis of a first signal value that is a signal value of the first signal;
• and
• reading, the second signal value or the third signal value from the storage circuitry on the basis of the instruction signal, and acquiring information on the signal value of the second signal input.