- 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