| 摘要 |
A wireless transceiver data communications system provides an encoded data communications system to operate within the low power, license free radio spectrum to provide remote control and monitoring functions. It consists of a pair of modules that are substantially the same and linked wirelessly together. Each module contains an antenna 1 matched to a transmitter 2 and receiver 3 which can be switched from transmit to receive under the control of the microprocessor 4. When the user applies an input signal to the module interface, it is encoded by the microprocessor into a serial datastream and passed to an encoding system 11 which encodes the stream into a suitable form (such as Manchester encoding) and then adds an identifier code and creates a packet of data. Before the packet is transmitted, the microprocessor uses the receiver to detect whether there is another operating on the same frequency in the vicinity that could cause a collision. |
