NCR 74 OFX (7874), User Manual

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Chapter 4: Operation 4-3
The Motion Detector is located at the upper ‐ right of the Operator Display Panel. The
laser diodes and spinner motor turn off after a user selectable period of operator
inactivity. This prolongs the life of the RealScan 74. The default non ‐ active time is
fifteen (15) minutes, but can be increased by programming. An item passing in front
of the Motion Detector causes the RealScan 74 to turn on. This movement is the
normal item scanning movement.
Scan Adviser Status Indicator
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Scan Adviser Status Indicator
The Scan Adviser Status Indicator is located diagonally to the left side of the Operator
Display Panel buttons. The three center LEDs turn dim green when the RealScan 74 is
ready to read a bar code. When the scanner reads a bar code, all five LEDs light up
brightly for an instant. During power ‐ up, if the unit goes into the Failure Mode, the
Scan Adviser Status Indicator displays a distinct LED pattern of colors to point to the
probable scanner error code that is used by the field engineer to repair the unit. Voice
messages are used to indicate errors as well. The Scan Adviser Status Indicator will
display one dimly ‐ lit green LED in the center when the RealScan 74 enters sleep
mode.
When using IBM ‐ 485 communications, the Scan Adviser Status Indicator slowly
flashes a red ‐ green ‐ green pattern nine times, then delays, then repeats indefinitely
when the RealScan 74 does not detect the 12V TRMPWR voltage from the IBM
terminal. It is still possible to successfully scan and weigh items with this Scan
Adviser pattern displayed. Possible causes for this red ‐ green ‐ green indication may be
one of the following:
•
Host IBM terminal is not turned on.
•
Interface cable is not connected between the POS and scanner.
•
IBM port 9x being used by the scanner is not generating the 12V TRMPWR signal.
•
Rarely, there could be an issue with the scanner digital board not detecting the
12V coming from the terminal.