A transmitter for a remote control group.

摘要

A transmitter (2) for a remote control group can learn a code embedded in a radiation signal received from another transmitter (2) of the same group. A non-resettable teach status switch (16) sets an instruction which is transmitted with every time a code is transmitted. This instruction may be recognised by a receiving transmitter and instructs operation of the receiving transmitter. The information may be to indicate whether or not the code may be learned by the receiving transmitter and therefore, a transmitter may be set as a "learn only" transmitter or as a "learn and teach" transmitter. It is only necessary for the user to press the relevant transmit button on each of the transmitters. This is because the controller (20) of the transmitter monitors a radio receiver (23) every time the transmit button is pressed. In addition, it delays transmission of a code when a transmit button is pressed so that it can listen to the radiation receiver (23). There are two delay periods, the first for detection of a signal, and the second longer period for recognition of a valid code. The second period is not used if no signal is detected in the first period. <IMAGE>