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Chapter 2: Features, Functions, and Kits 2-5
No Display
If the 7870 is ordered with no display, the scale information is usually
displayed on the host terminal display. Please note, the host terminal
must be approved to perform a live/gross scale weight. This
arrangement is not available in all host terminals and some Weight and
Measures authorities do not permit this arrangement.
Interface Types
The NCR 7870 communicates with the host terminal through various
types of interfaces. The 7870 Scanner always uses one interface cable.
However, some host terminals require dual cables for and NCR 7870
Scanner/Scale. See the
Interface Cables
section in Chapter 3: Site
Preparation for available interface cables.
Laser Scanner
The 7870 operates with the performance of two scanners yet the bi-
optic scan pattern is created by a single laser and spinner motor. A 24 -
line convergent scan pattern (12 lines per scan window) is generated by
the laser diode. A 3-Phase, DC, brushless motor spins a tetrahedral
mirror at 6000 RPMs. The laser beam is reflected onto the stationary
mirrors in the Optics Assembly and then out the Scan Windows. The
Spinner Motor provides a scan speed of 2400 scan lines (100 scan
frames) per second. This enables the 7870 to read at a continuous item
speed of 2.0 meters per second. An experienced checker scans at a rate
of 0.8 to 1.0 meters per second, so the 7870 is able to keep up with high
volumes and fast checkers.
Power Supply
A universal, switching Power Supply is used to provide DC voltage. It
has a replaceable, 3 m (10 foot) cord for connection to the power outlet
or source. A low voltage power cable connects the Power Supply to
the unit. The Power Supply can be fixed to the unit’s chassis on or
located on the floor or checkstand in the NCR 7870-1000 and 2000. For
other models, the Power Supply must be installed in the checkstand.