The invention relates to alarm systems using wired and wireless transmission systems. A method for transmitting a signal from wired security sensors and/or fire annunciators is proposed, the method comprising wire-connecting the security sensor and/or fire annunciator to an input from a set of inputs of a signal transmission device, which comprises an analogue-to-digital converter that is coupled to a controller and a power supply unit. Each of the set of inputs of the signal transmission device is associated with an input zone from a set of the input zones. Information regarding the input zones and the inputs of the signal transmission device associated therewith is stored within a storage device that is coupled to the controller. The controller periodically receives wired connection resistance parameters for each input zone, and the received wired connection resistance parameters of the input zone are compared with predefined resistance parameters of this input zone, which are stored within said storage device. A status is assigned for each input zone depending on results of comparison of the received resistance parameters with the predefined resistance parameters, including an “alarm” status for the input zone that has the wired connection resistance parameters, which differ from the predefined resistance parameters. The controller forms a data packet comprising information regarding a status of each input zone, for which the wired connection of the security sensors and/or fire annunciators has been performed, as well as an information regarding an operation status of the signal transmission device. The formed data packet is sent via a radio module, which is coupled to the controller, to a central station that is configured at least to inform regarding a receipt of the “alarm” status. Also, a signal transmission device for implementation of the above-described method is proposed.