NCR 7870 manual Interface Types, Laser Scanner, Power Supply, No Display

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.