NCR 74 OFX (7874), User Manual

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2-10 Chapter 2: Site Preparation
Power Considerations
The RealScan 74 receives power from an external DC power supply or from +12V DC
supplied by the POS terminal . The power supply mounts in a remote location close to
the RealScan 74. The NCR supplied power supply is a 40 ‐ watt switching power
supply with the following inputs.
•
Voltage: 90 to 264 Vac
•
Frequency: 47 to 63 Hz
•
Current: 0.9 A
The RealScan 74 has no power switch in the unit, therefore the operator of RealScan74
must have a way to remove AC power in the event of an emergency.
The power supply has a green LED which is lit when there is an AC voltage present
and the power supply is functioning correctly.
Power Transient Protection
Voltage transients, surges, sags, impulses, and spikes may be experienced routinely or
sporadically. When such phenomena occur, the equipment requires the use of
protective devices to ensure proper operation.
Cable Connections
The following diagram shows the wiring connections located at the rear of the
RealScan 74.
25316
Auxiliary RS232 Port 2
Checkpoint
Interlock Port
USB Peripheral Port
Auxiliary RS232 Port 1
Scale Display Port
Main (POS)
RS232 / RS485
Communication Port
Main (POS) USB
Communication Port
Power Connector