| 摘要 |
An optical data sensing system includes an optical wand (14) adapted to optically sense a record member containing data encoded in a bar code, and a reading circuit (20) for decoding the sense data for transmission to a computer (26). A power source (30) is coupled via a switch (36) to the wand (14) and the reading circuit (20). A control circuit is effective to operate the switch (36) periodically to determine whether the wand (14) is sensing the record medium. When the wand (14) is sensing the coded data, control signals are provided to operate the switch (36) for at least a predetermined time such that the reading circuit (20) can process the sensed data. An economy in power supply is achieved. |
