Method for transmitting a message through a serial channel in an anti-theft system of the fog-generating type, the anti-theft system of the fog-generating type comprising: - an anti-theft device of the fog-generating type comprising a control board with a microcontroller, - a second anti-theft device, and - a remote board, the remote board being installed in the anti-theft device of the fog-generating type and connected to the second anti-theft device, or being installed in the second anti-theft device and connected to the anti-theft device of the fog-generating type, wherein said message comprises an orderly sequence of characters, said sequence comprising a start-of-sequence marker character and an end-of-sequence marker character, said start-of-sequence marker being followed by at least one character which compose the data field of the message, said method comprising the steps of: - sending, by the remote board, the start-of-sequence marker character to an anti-theft device of the fog-generating type; - sending, by the remote board, the characters which compose the data fields of the message to the anti-theft device of the fog-generating type; - remotely executing, by the remote board, a control on the characters sent to the anti-theft device of the fog-generating type and sending, by the remote board, the characters which represent the result of the control to the anti-theft device of the fog-generating type; - comparing, by the anti-theft device of the fog-generating type, the characters which represent the result of the control performed by the remote board with the characters which represent the result of a control computation locally performed by the anti-theft device of the fog-generating type; - sending, by the remote board, the end-of-sequence marker character to the anti-theft device of the fog-generating type; - interpreting and executing the message by the anti-theft device of the fog-generating type; - issuing a reply of interpreted and executed message by the anti-theft device of the fog-generating type to the remote board; wherein said message from the remote board has the function of activating an arming of the anti-theft device of the fog-generating type and/or a shooting of the anti-theft device of the fog-generating type; and wherein the actual arming status of the fog-generating device is determined by a logic AND operation between the message adapted to activate an arming of the device and a signal sent by a local arming input present on the anti-theft device, the actual shooting status of the fog-generating device being determined by a logic OR operation between the message adapted to activate an arming of the device and a signal sent by a local arming input present on the anti-theft device. - an anti-theft device of the fog-generating type comprising a control board with a microcontroller, - a second anti-theft device, and - a remote board, the remote board being installed in the anti-theft device of the fog-generating type and connected to the second anti-theft device, or being installed in the second anti-theft device and connected to the anti-theft device of the fog-generating type, - sending, by the remote board, the start-of-sequence marker character to an anti-theft device of the fog-generating type; - sending, by the remote board, the characters which compose the data fields of the message to the anti-theft device of the fog-generating type; - remotely executing, by the remote board, a control on the characters sent to the anti-theft device of the fog-generating type and sending, by the remote board, the characters which represent the result of the control to the anti-theft device of the fog-generating type; - comparing, by the anti-theft device of the fog-generating type, the characters which represent the result of the control performed by the remote board with the characters which represent the result of a control computation locally performed by the anti-theft device of the fog-generating type; - sending, by the remote board, the end-of-sequence marker character to the anti-theft device of the fog-generating type; - interpreting and executing the message by the anti-theft device of the fog-generating type; - issuing a reply of interpreted and executed message by the anti-theft device of the fog-generating type to the remote board;