| 摘要 |
A data acquisition system that utilizes a two wire network having a plurality of randomly located remote units connected to a central unit which is adapted to transfer voltage values to and from the remote units. A pulsewidth and pulse count protocol is employed that allows remote unit mode control, addressing each of the remote units for transferring sensor voltage inputs or control voltage outputs, and maintenance of network synchronization. The system does not require special wire type or routing constraints, provides automatic calibration means at the sensor location, allows multi-sensor inputs as well as multi-control voltage outputs, provides power to remote unit electronics, and provides electrical power for sensor operation utilizing the two wire network.
|
