| 摘要 |
Digital information is transmitted between stations using a marking signal sent at a time representing the information, relative to a time reference ion signal set to all the stations. This method is used by a central station to address a selected remote station and by the latter to send its address and watt-hour meter readings back. The marking signals, transmitted by radio (or over power lines or telephone lines), are used to start and stop digital counters located at each of the stations. These digital counters are synchronized by the time reference signal transmitted over the power lines of the power distribution system. <IMAGE> |
