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Long Range FDX/HDX Industrial Readers

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    This is a new breed of smart reader with superb performance. No matter what type of tag, FDX/HDX, glass or normal tags, it works to get the best possible performance from all tags at all times. It features very long read range and is intended for logistics and cattle tagging. Read ranges in the order of 110 thru 140 cm are possible with our 600x800mm Antenna.
Features

—Very Long Read Range with FDX Tags
—Very Long Read Range with HDX Tags
—Multiple Readers Allowed
—DSP - Digital Signal Processing
—Continuous or single Read
—Antenna Safety Lockout
—Decimal or Hexadecimal Output
—Readers Encapsulated in Rugged Die-Cast Enclosures
—Low Power
—Auto Tuning
—Vendor Antenna tune Facility
—Water and UV Resistant Enclosure
General Description

The series readers are dual readers that read HDX B (AMPSK, ISO11784) and FDX (BI-Phase ISO11785) tag simultaneously. The series readers employ DSP techniques that dramatically reduce interference, noise and vibration effects making the reader suitable for hostile noisy environments. Excellent read range can be achieved with both glass and conventional open coil format tags partly because the reader can instantly change its internal algorithms to adjust to differences in individual tag parameters. It has a synchronization feature that allows multiple readers to be used in close proximity.

  The  series readers are equipped with a sophisticated auto-tune facility that compensates for Antenna drift

    due temperature changes. The readers perform an auto-tune shortly after power up. (allows the host computer to command an auto tune at any time down the RS232. See the command schedule)

Reader Specifications

Power requirements

11.4volt to 13.7volt Regulated DC @ 0.5 – 1.5 Amp.

Interface

RS232 @ 9600-19200-38400 baud : N,8,1

Read Range with 600x800mm antenna

Up to 110-140 cm (2piece antennas can reach 200cm)

Frequency

134.2KHz

Transponder

ISO Transponder

Auto-tune

Internal upon switch on and remote via RS232.

Tags

FDX/HDX 128bit ISO11784/5 Tags

Output Format

Decimal or Hexadecimal

Antenna Safety Interlock

Stops RF Power if Antenna Socket Unplugged

Antenna Impedance

8-15uH

Synchronization

Up to 6 readers

Tenth Cycle Synchronization

20mS, 50mS

Case

Painted Die-cast Aluminum.

Sockets

Water Resistant

Weight

1.7kg (nominal)

Size

40mmx220mmx125mm

Minimum HDX Period

2.5mS with no HDX tag in Range

Minimum Read Time FDX

50mS. (Range 88cm)

Maximum allowed FDX search

100mS

Absolute Maximum/Minimum Ratings
—Max Input DC Voltage 18volts
—Minimum Input DC Voltage -18volts
—Max Input current 1.2 amperes
—Max Antenna Voltage 400Volt PKP across both terminals.
—Max Case Temperature 80deg C
—Min Case Temperature -30deg C
—Max Sync Voltage 6V
—Min Sync Voltage -0.5V
—Max Beeper Voltage 15V
—Max Current on beeper wire 30mA
Switch-on Report

    The switch-on report gives three groups of information.These are software version, the software date and the tuning variable. The software version and the software date are for reference only. The Tuning Variable shows the current state of the antenna tuning in hexadecimal. For users who are using the Antenna both the tune value digits have meaning. All values except 00, 01, 02, 3D, 3E, 3F are acceptable. If the tune value is not acceptable it will indicate that the antenna is too close to a metal obstruction or other condition.

Command Interface
The reader has a simple RS232 command user interface. The command interface is entered with an STX (start of transmission) which is a binary $02 and ‘CMD’ as an ASCII string. For test purposes, these commands can be sent using a terminal. Once the command interface has been entered interface the commands can be sent. The commands can be easily typed in from a terminal keyboard.
Auto Tuning

The performs a self auto-tune when it is switched on,and after this it only performs an auto-tune if it is commanded to do so. The user can command an auto-tune at any time by sending (02) CMD1 (03). It is advisable to command the reader to perform an auto-tune every hour or so, so that the reader can compensate for any small changes in the antenna tuning. This has been left to the user because an auto-tune cycle takes about 100ms during which no tags will be read. In some critical high speed applications the user may determine when an auto-tune cycle ‘dead time’ will have the least affect. The reader will send a report in the following format: - Tune Value = 08, where 08 is the tuning variable.

Installation of Antennas

    DSP techniques provide the reader with good noise rejection but it makes sense not to use up the benefit this provides by placing the antenna in a bad position. Some simple rules should be followed when the antenna is installed. Avoid power cables as these can be a source of electrical noise, especially in industrial situations. Do not place the antenna in close proximity to metal structures particularly sheet metal. Small metal fittings are not a

    problem and will not affect performance. Some energy saving lights and switching power supplies can generate   lot of interference. Do not place the antenna near known sources of electronic noise. If you have any doubt, ask your supplier.

Antenna Spacing

The normal spacing of a 600mmx800mm antenna between multiple readers is 2.5meters if the Antennas are facing each other. In general the antenna spacing can be 4x the maximum dimension of the antenna for negligible loss of performance. Spacing less than the recommended may tried. The absolute minimum limit to the distance between antennas is 1.5x the maximum antenna dimension, if the antennas are facing each other. If the Antennas are not facing each other then they may be placed closely in one of the ‘Null’ pick-up positions. In ‘null’ positions, antennas may be sited very close to each other.

Antenna Safety Interlock

The series readers have an electronic interlock to turn off the radio frequency power when the antenna plug

     is removed. In this condition the read LED will flash repeatedly until the antenna socket is plugged in. Never operate the reader without an antenna connected. A ‘Warning RF Socket Bad Connection’ message will also be sent over the RS232 connection. These safety features alone must not be relied upon to protect the reader against abuse or Antenna malfunction. Always use a correctly specified antenna.

Antenna High Voltage

    The  series readers sense the RF output voltage upon  switch on. This is partly to warn the user against changing to an unsuitable antenna. If the RF voltage is unexpectedly high a ‘Warning High RF Voltage’ message will be sent over the RS232 connection. If an incorrect impedance antenna is being used the reader may be not able to detect an over voltage condition and could lead to component stress and failure

Synchronization Line

If multiple readers are to be used in close proximity they must be synchronized or there may be loss of read range,

    particularly with HDX tags. FDX range can be affected to a less extent. The readers must adjust the radio frequency power so that the readers can work together. The incorporates a special synchronization line that allows the readers to ‘talk’ to each other to get the best results. No user knowledge is required and once the cables are connected the readers adjust in milliseconds and stay adjusted.

Connecting Multiple Readers

    In multiple reader configurations all the sync lines must connected to ensure performance. All the sync cables are connected in parallel. The beeper logic outputs (yellow wire on power cable) may also be parallel wired to give a single logic output. This may significantly ease the wiring of large systems

User Antennas

The Antenna has a nominal inductance of 8-15uH and has a search coil 820mmx620mm. If the user wishes to use their own antenna the inductance should be in this range.

RS232 Communication Interface

The RS232 communication Interface has a software selectable baud rate of either 9600, 19200 or 38400 baud with no parity, 8data bits and 1 stop bit (xxxxx:N,8,1). The cable provided is 3m long. The interface itself will work reliably up to 100meters using a good quality cable. See command interface for commands. For long distance communication the 9600 baud is generally best.

Distance from Reader to Antenna

    There may be occasions where the Antenna is required to be placed remote from the reader. The antenna cable supplied is 3 m long. The cable can be extended with varying degrees of power loss to the Antenna. However,

   power loss of power to the Antenna does not directly mean a corresponding loss in range, for example a 50%

   power loss in the cable will cause a loss of range of about 15%. In general use a high quality screened cable for lengthy extensions. The cable should be chosen to have a series inductance <15uH.

Storage

   The  Reader Module and cables should be stored at a temperature between 0 to +35deg C. We recommend a plastic sealed bag with a silicon desiccant to keep the moisture low. Storage at high temperatures may reduce the life of the product.