General Hardware

Installation Principles


  • The IR RDR range in optimal conditions is 25m’ facing the reader.
  • The reader’s range decreases as a function of the angle from the direct line

IR Reader Noise

Least amount of IR Noise ------------------------------------------------------------------------ Most amount of IR Noise

Incandescent - Fluorescent - High Efficiency Fluorescent - Large Plasma Displays - Direct Illumination -Reflected Sunlight - Direct Sunlight

RF Reader Blockage

Least Blockage ---------------------------------- Most Blockage

Furniture - People - Brick - Cement - Reinforced Concrete - Metal

RF Reader Placement

  • RF signals are significantly attenuated while passing through metal, cement walls and ceilings
  • Install the readers as far away as possible from RF emitters such as: transmitters, microwave ovens, large electrical motors, electronic ballasts
  • Make sure that the reader’s antenna is not blocked by metal objects

Measuring RF Background Noise

  • Use site builder with portable RDR to measure the noise level.
  • Noise level at the RDR placement should not exceed 80 units
  • Make a survey of the operating frequencies +- 1MHz

(contact Elpas for spectrum analyzer recommendation)

Multiple Reader Placement

Elpas recommend a 15-20m' distance between readers in optimal conditions to allow good overlapping.

LF Beacon Installation

  • Installed at least 50 cm from any metal.
  • Powered by 26 AWG cable connected to Elpas junction box. Max length is 3 m. No data in cable.
  • Maximum LF power is in front (and backward).
  • Install 2 LF beacons for better detection capability and direction determination (one before door and another behind). Distance between the LF beacons should be at least 4 m.
  • Set the LF beacon ID code by the DIP SW (8 positions)
  • Do not set the not allowed ID codes.
  • When not allowed ID code is set the LF beacon will beep.
  • When connecting first time the LF it will be beep after the self test (1-2 sec).



  • Use a floor plan
  • Carefully plan reader and junction box placements
  • Shortest possible path
  • Check connectivity
  • Document the wiring layout for future maintenance


Use Elpas cables only

  • –Use ELPAS’ 18AWG backbone cable (P/N ERS01703)
  • –Use ELPAS’ reader cable (2.5m’ 26AWG ERS01702)

Definitions and Rules

  • Segment: Continuous media bounded on at least one side by either an interface card, router or PLR
  • Channel:Network segments bounded on at least one side by a router. For installation without routers, the entire network is defined as a single channel
  • Max of 9 segments per channel
  • Node: Device that contains a neuron chip (requires service pin registration)
  • Max of 50 nodes per segments
  • The first 50 RDRs’ in a channel can work without a PLR
  • Max of one PLR between a node and the network card/Router
  • The 4 outputs of the PLR constitute one free topology segment

Bus Topology Specifications

  • Total Cable length 2000 meters (18AWG&26AWG)
  • Double ended Termination 105 Ohm +- 1% 0.25W

Free Topology Specifications (recommended for small sites only)

  • Total Cable length 500 meters (18AWG&26AWG)
  • Single point Termination 52.3 Ohm +- 1% .25W (anywhere on the segment)

Power Supply Planning

  • Apply at least one P/S per segments that contain nodes
  • A node should be powered only by one P/S
  • For accurate planning calculate the power according to the following:

–Power required per IR & RF readers is 500/600mW 12-24V respectively

–Backbone resistance 2.2 Ohms per 100m’ single wire

–Ignore the RDR cables (2.5m’)

–Minimum operational requirement for a RDR is 12V