IMPROVED ONE WAY AUTOMATIC METER READING SYSTEM

摘要

A meter interface unit for use in a one way automatic meter reading system comprises first means for frequently transmitting a short burst transmission suitable for reception by a hand held or mobile receiver, and second means for transmitting narrow band data messages suitable for reception by a fixed network first tier receiving station. The receiver at the first tier receiving station has means for suppressing the short transmissions to prevent interference with the slow busts from the second transmitting means. Repeated packet collisions between the short bursts are avoided by randomly varying the time period between the short bursts.