Periodic communication method between at least one first system and at least one second system by means of a full-duplex synchronous serial link

A periodic communication method between at least one first system and at least one second system by a full-duplex synchronous serial link, a method in which, during one communication period, data are exchanged between the first system and the second system 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,
• the clock signal being routed via the link over a time interval, wherein an amplitude of the clock signal is less than the communication period, the message from the first system to the second system and the message from the second system to the first system both being routed via the link over said time interval, and a communication period comprising the following steps:
• (i) measurement of values of at least one electrical or mechanical quantity within a device interacting with the first system,
• (ii) routing via the link to the second system of these values sent by the first system,
• (iii) processing by the second system of the values received and generation of resultant values,
• (iv) routing via the link to the first system of these resultant values sent by the second system, and
• (v) processing by the first system of these resultant values and application of these resultant values in the device.