摘要:
A method of operating a laser scanner for reading a barcode. The laser scanner is configured to operate in at least two operating modes including a scanning mode and an aiming mode. The method includes operating the laser scanner in the scanning mode after a trigger signal is generated by a trigger on the laser scanner, and decoding the electrical signal that is received from the photodetector when the laser scanner is in the scanning mode. If the electrical signal from the photodetector is not successfully decoded after a first predetermined time period since the trigger signal is generated, alternating the laser scanner between the aiming mode and the scanning mode.
摘要:
Laser power control arrangements interrupt power to a laser used in electro-optical readers upon detection of an over-power condition not conforming to preestablished regulatory standards. In one embodiment, during an operational mode, a difference between laser drive currents at two operating points is compared to a difference between laser drive currents at the same two operating points during a calibration mode. The over-power condition is recognized when the difference during the operational mode exceeds the difference during the calibration mode by a predetermined amount. In another embodiment, the laser is only energized to emit the beam at a reduced power level well below regulatory standards for staring at even if a motor drive failed.
摘要:
Laser power control arrangements interrupt power to a laser used in electro-optical readers upon detection of operating conditions not conforming to preestablished standards, and adjust power to the laser to enhance reader performance without violating prevalent safety standards.
摘要:
Laser power control arrangements interrupt power to a laser used in electro-optical readers upon detection of an over-power condition not conforming to preestablished regulatory standards. In one embodiment, during an operational mode, a difference between laser drive currents at two operating points is compared to a difference between laser drive currents at the same two operating points during a calibration mode. The over-power condition is recognized when the difference during the operational mode exceeds the difference during the calibration mode by a predetermined amount. In another embodiment, the laser is only energized to emit the beam at a reduced power level well below regulatory standards for staring at even if a motor drive failed.
摘要:
The operating condition of data capture systems, such as electro-optical readers, RFID readers, and imagers, is monitored and reported to a host which preferably modifies the operating condition when the latter is outside a preestablished setting.
摘要:
A device for picking rocks from a field includes a frame which is mounted on a pair of wheels. A hitch is pivotally attached to the frame and is adapted for engagement with a conventional tractor. The offset of the hitch is adjusted by a hydraulic cylinder to adjust the tracking of the frame behind the tractor. A reel is mounted for rotation on the frame and is powered by a chain and sprocket drive from a rotary hydraulic motor. The reel has a plurality of radially extending spokes, each terminating in a stone picking rake formed by a plurality of spaced teeth. The elevation of the reel with respect to ground level is adjusted by a pair of hydraulic cylinders connected to a pivotal reel mounting frame. A depth stop mechanism is provided to lock the reel in an adjusted elevational position. In a first embodiment, a semi-cylindrical stone collecting box is mounted within the reel frame. As each of the reel spokes rotates to a top position, collected stones fall by gravity into the open stone box. A hinged door is provided in the bottom of the stone box and is operated by a hydraulic cylinder for enabling the collected to be deposited in a desired location. In a second embodiment, the stone collecting box is replaced by an endless belt type conveyor for transporting the stones to a trailer or truck bed.
摘要:
A microprocessor and an application specific integrated circuit are embodied as two chips mounted on a printed circuit board which is, in turn, mounted on a scan engine for use in an electro-optical reader. This dual chip architecture is readily configurable and controls reader operation.