EVENT MONITORING TRANSCEIVER

摘要

A data terminal utilizes a time division multiplexer to monitor traffic on 16 input lines and convert the information from parallel to serial form as a 16 word serial message, records the count data for each input line, and transmits accumulated count data over a phone line as a serial message of 16 sequential 16 bit words. The terminal has a Count Register and a Storage Register each of which is a 256 bit serial shift register. The Count Register is the active memory that stores the counts of the events as they occur while the Storage Register receives data from the Count Register periodically, and holds the data for transmission. The terminal operates in either cumulative or peak modes. In cumulative mode the count for each input line is transmitted when the terminal is interrogated. In peak mode the terminal stores and transmits for each line only the highest count which occurs during successive selected time intervals, such as an hour or half hour. In both modes data is transferred from the Count Register to a Comparator for comparison with data in the storage Register and the higher count is retained in the Storage Register. Incoming data continues to be received and the counts in the Count Register are incremented even during data transfer. One terminal input circuit may be utilized to count elapsed monitoring time in minutes. A traffic usage scanner pulse is provided to activate a usage scanner. Operation of the terminal is automatic, and data readout and subsequent clearing of the registers and counters is controlled by the remote interrogating unit.