Safety system for moveable closures

A closure system for a passageway or opening to be closed by a closure, comprising:

• an obstacle detection system proximate to the passageway or opening, so to detect objects in or near the path of the closure during operation;
• a remote module coupled to the obstacle detection system, the remote module having a remote module power source, a remote module timer, and a communication unit;
• a motor arranged to drive the closure between open and closed positions;
• a controller coupled to the motor to control operation of the motor and therefore movement of the closure;
• a base station coupled to the controller for communication with the remote module, the base station configured to transmit synchronisation signals at first prescribed intervals;
• wherein the remote module is arranged to have at least three modes of power usage, an operation mode in which the obstacle detection system is activated, a standby mode in which the obstacle detection system is inactive and the communication unit is active, and a sleep mode in which the obstacle detection system is inactive and the communication unit is inactive;
• and wherein, when in sleep mode, the remote module is configured to switch for a preset duration to said standby mode at or substantially at said first prescribed intervals to detect said synchronisation signals, thereby to monitor the communications link between the base station and the remote module.