Method for monitoring a communication between a transmitter entity and a receiver entity, said transmitter entity sending data communication frames to the receiver entity, the time elapsed between two data communication frames being at least equal to a minimum duration, said method being characterized in that it comprises the following steps: - Determination of an instant of transmission T diag of a first diagnostic frame of rank 0 according to the following relation: Tdiag 0 = Δt mini − Δtdiag in which: in which: - Δt mini corresponds to a minimum duration between the transmission of two communication frames, - Δtdiag corresponds to a duration to be complied with to obtain optimized reliability in the state of the communication, the duration Δtdiag being determined from the following relation: Δtdiag = Δt Ln Fiab Ln 1 − τ failure With: - Fiab which corresponds to the reliability sought - τ failure which corresponds to the rate of occurrence of failures of communication between two data communication frames, - Δt which corresponds to the duration between two successive data communication frames. - Emission by the transmitter entity of said first diagnostic frame at the determined instant of transmission, destined for the receiver entity, - Determination on the basis of an increasing function of the instants of transmission Tdiag[i] of the following diagnostic frames of rank i, said increasing function being chosen to obtain instants of transmission that are separated from one another by a variable duration, - Emission of said diagnostic frames of rank i by the transmitter entity destined for the receiver entity, as long as a new data communication frame has not been transmitted by the transmitter entity. - Determination of an instant of transmission T diag of a first diagnostic frame of rank 0 according to the following relation: Tdiag 0 = Δt mini − Δtdiag in which: in which: - Δt mini corresponds to a minimum duration between the transmission of two communication frames, - Δtdiag corresponds to a duration to be complied with to obtain optimized reliability in the state of the communication, the duration Δtdiag being determined from the following relation: Δtdiag = Δt Ln Fiab Ln 1 − τ failure With: - Fiab which corresponds to the reliability sought - τ failure which corresponds to the rate of occurrence of failures of communication between two data communication frames, - Δt which corresponds to the duration between two successive data communication frames. - Δt mini corresponds to a minimum duration between the transmission of two communication frames, - Δtdiag corresponds to a duration to be complied with to obtain optimized reliability in the state of the communication, the duration Δtdiag being determined from the following relation: Δtdiag = Δt Ln Fiab Ln 1 − τ failure With: - Fiab which corresponds to the reliability sought - τ failure which corresponds to the rate of occurrence of failures of communication between two data communication frames, - Δt which corresponds to the duration between two successive data communication frames. - Fiab which corresponds to the reliability sought - τ failure which corresponds to the rate of occurrence of failures of communication between two data communication frames, - Δt which corresponds to the duration between two successive data communication frames. - Emission by the transmitter entity of said first diagnostic frame at the determined instant of transmission, destined for the receiver entity, - Determination on the basis of an increasing function of the instants of transmission Tdiag[i] of the following diagnostic frames of rank i, said increasing function being chosen to obtain instants of transmission that are separated from one another by a variable duration, - Emission of said diagnostic frames of rank i by the transmitter entity destined for the receiver entity, as long as a new data communication frame has not been transmitted by the transmitter entity.