Method of dialogue with a computer on an on-board bus of a vehicle

A method for dialoguing from a first on-board bus in a vehicle, the method comprising:

• connecting a first computer directly to a second on-board bus in the vehicle, the first computer not being directly connected to the first on-board bus in the vehicle;
• connecting the first on-board bus in the vehicle to the second on-board bus in the vehicle by a second computer directly connected to the first on-board bus in the vehicle and to the second on-board bus in the vehicle;
• connecting a third computer, which is in the vehicle, directly to the first on-board bus in the vehicle, the third computer processing a main command for the first computer, and the third computer not being directly connected to the second on-board bus in the vehicle;
• generating, via the third computer, which is in the vehicle and directly connected to the first on-board bus in the vehicle, a write command to write a description of said main command in a first dedicated data zone of the second computer;
• transmitting, via the third computer, which is in the vehicle and directly connected to the first on-board bus in the vehicle, said write command to the second computer when the second computer is detected as ready to respond to said write command;
• transmitting, via the second computer, one or more auxiliary commands to the first computer in order to respond to the main command after receiving said write command;
• transmitting, via the first computer, a response to each received auxiliary command;
• storing, via the second computer, at least one received response in a second dedicated data zone;
• transmitting, via the third computer, which is in the vehicle and directly connected to the first on-board bus in the vehicle, a read command to read said second dedicated zone for the second computer when the second computer is detected as ready to respond to said read command;
• transmitting, via the second computer, a response to the received read command;
• and
• responding, via the third computer, which is in the vehicle and directly connected to the first on-board bus in the vehicle, to the main command upon at least one receipt of a response to the read command to read the second dedicated zone of the second computer, in which the response transmitted by the first computer is stored.