Method for communicating between at least one first system and at least one second system

A method for communicating between at least one first system and at least one second system by way of a full-duplex synchronous serial link being able to simultaneously route between said systems data comprising:

• at least one message from the first system to the second system;
• at least one message from the second system to the first system;
• and
• a clock signal,
• wherein a galvanic isolation is interposed between the first system and the second system and wherein the full-duplex synchronous serial link crosses the galvanic isolation, the method comprising:
• receiving, by the second system, a message and a clock signal sent by the first system, delayed and in substantially phase, said message being transmitted through a first wire of the full-duplex synchronous serial link, and said clock signal being transmitted through a third wire of the full-duplex synchronous serial link;
• sending, by the second system, a message to the first system, through a second wire of the full-duplex synchronous serial link;
• sending back the clock signal received by the second system to the first system through a fourth wire of the full-duplex synchronous serial link, with said message sent by the second system through the second wire of full-duplex synchronous serial the link;
• and
• receiving, by the first system, the message sent by the second system through the second wire of the full-duplex synchronous serial link, and the sent-back clock signal through the fourth wire of the full-duplex synchronous serial link, delayed and in phase,
• wherein the fourth wire links an area of the third wire and the first system, said area of the third wire being arranged downstream of the galvanic isolation when the link is travelled from the first system in the direction of the second system,
• wherein the galvanic isolation comprises a first part and a second part arranged in parallel,
• wherein the first part of the galvanic isolation is crossed by the first, second, third, and fourth wires, and
• wherein the second part of the galvanic isolation is crossed by a fifth wire.