Installation

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These questions are derived from the Self Test Software Practice Test for CompTIA’s RFID+ exam.

Objective: Installation
SubObjective: Given a scenario, interpret a site diagram created by a RFID architect describing interrogation zone locations, cable drops, device mounting locations

Single Answer, Multiple Choice

A shirt manufacturing company plans to deploy an RFID system to automate the product packaging system. Different packaging will be used for shirts of different price ranges. According to the RFID system plan, shirts will be tagged. Based on the category and price information stored in a tag, appropriate packaging will be used.

The following logical architecture diagram has been designed for this RFID system:

What does the actuator in the logical architecture diagram do?

  1. It automatically turns the interrogator on and off.
  2. It rings an alarm when a tagged item is not read successfully.
  3. It monitors and controls a packaging line.
  4. It decreases the interrogator signal strength.

Answer:

C. It monitors and controls a packaging line.

Tutorial:

The actuator highlighted in the logical architecture diagram will monitor and control the packaging line. An actuator is a mechanical device that is used to either control or move an object. For example, an actuator may be used to open an access gate when an interrogator successfully reads a tag. A programmable logic controller (PLC) is one of the most versatile actuators that can be used in RFID systems to automate a process. A variety of mechanical tasks, such as monitoring and controlling a product packaging line or applying a predetermined amount of torque to nuts in an automobile production line, can be performed by using a PLC. In this scenario, the interrogator, after reading a tagged item, will instruct the actuator to perform a specific task, such as moving the tagged item to an appropriate packaging line depending upon the category and price of the item.

The actuator highlighted in the logical architecture diagram will not turn automatically turn the interrogator on and off. Sensors are used to automatically start and stop interrogators based on the occurrence of an external event that is detected by the sensors.

The actuator highlighted in the logical architecture diagram will not ring an alarm when a tagged item is not read successfully. Annunciators are used to set audio-visual signals. An annunciator is an electrically controlled signaling device that may be used to generate audio-visual signals in response to events, such as audible alarms and light stacks.

The actuator highlighted in the logical architecture diagram will not decrease the interrogator signal strength. Attenuators are used to reduce the power of the RF signal emitted by the interrogator as the signal travels from the interrogator to the antenna through the cable.

Reference:

RFID Sourcebook, Chapter 1: Technology Overview, Section 1.2.5: Sensor, Annunciator, and Actuator, p. 41.

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