| 摘要 |
<p>The Described invention enables communication between nodes on a common channel signalling system without erroneous identification of one device for another. The transmitting device sends an individual code (the RNC) which is learnt by the receive equipment and stored in non-volatile RAM. This sequence is only necessary on initialisation. Subsequent communications use the RNC known to both devices to distinguish the source of the transmission from another signal of similar structure but different RNC. Many devices (receivers or transmitters) can use the same channel without miss operation of any of the devices. The advantage of this system over the traditional method of transmitting one of several pre-determined codes is that the likelihood of coincident settings is reduced to a negligible level. Additionally the end user of the equipment is not required to set up complex codes or work on small electrical switches, which could present problems for the elderly and infirm. The codes used are secret to the systems using them thus avoiding the necessity of remembering code numbers or the security risk of writing them down. It is a simple matter to change the RNC code, the teach/learn system can be re-activated by a couple of switches, thus setting new codes into the system easily. <IMAGE></p> |
