Communications device and a method for control of its operation

Method for controlling a communications device which has a main operating unit and a subunit,

• in which, after one operating period, operating state data for the main operating unit are stored in a status memory in the subunit and, after this, the voltage supply for the main operating unit is switched off in order to change the communications device to an energy saving method,
• in which, after the voltage supply for the main operating unit is switched on, the stored operating state data are transmitted from the status memory to the main operating unit in order to operate the communications device during the following operating period,
• wherein a time indicator is produced at a time after the voltage supply for the main operating unit has been switched on, in order to define the start time for the following operating period, and
• wherein the time interval between the time indicator for the start time and the following operating period is measured by the main operating unit in order to optimize the duration of the effective time for which the main operating unit is switched off in a communications device whose main operating unit operates periodically.

Method for controlling a communications device which has a main operating unit and subunit,

• in which, after one operating period, operating state data for the main operating unit are stored in a status memory in the subunit and, after this, the voltage supply for the main operating unit is switched off in order to change the communications device to an energy saving method,
• in which, after the voltage supply for the main operating unit is switched on, the stored operating state data are transmitted from the status memory to the main operating unit in order to operate the communications device during the following operating period,
• wherein a time indicator is produced at a time after the voltage supply for the main operating unit has been switched on, in order to define the start time for the following operating period,
• wherein the waiting time is predetermined for the subunit as a function of the time interval between the time indicator and the start time of the following operating period by the main operating unit, and the waiting time can be redefined for each operating period.

Method for controlling a communications device which ha a main operating unit and a subunit,

• in which, after one operating period, operating state data for the main operating unit are stored in a status memory in the subunit and, after this, the voltage supply for the main operating unit is switched off in order to change the communications device to an energy saving method,
• in which, after the voltage supply for the main operating unit is switched on, the stored operating state data are transmitted from the status memory to the main operating unit in order to operate the communications device during the following operating period,
• wherein the voltage supply for the main operating unit is switched on by means of a switch-on signal from the subunit after a respectively predetermined waiting time has elapsed,
• wherein the end of the waiting time is defined in the subunit with the aid of a clocked counter whose running count is compared with a first comparison value which corresponds to the waiting time and is transmitted from the main operating unit to the subunit,
• wherein the counter is restarted after the waiting time has elapsed, in that the running count is compared with a second comparison value in order to supply the time indicator to the main operating unit, and this time indicator is used to define the start time of the following operating period.