HT RM440 Family
HITAG™ Proximity Reader Module
Hardware
November 1996Product Specification
Revision 2.0
Proximity Reader Module HT RM440 Rev. 2.0 November 1996
Htrm440.doc/HS Page 2 of 27
Table of Contents
1. Introduction 5
2. System Overview 6
2.1. Transponders 6
2.2. Host 6
2.3. I/O - Functions 6
2.4. Connecting the Antenna 7
2.5. Behaviour with Several Transponders 7
3. Specifications 8
3.1. Electrical Specifications 8
3.1.1. Power Supply 8
3.1.2. Modulation 8
3.1.2.1. Read/Write Device ⇒ Transponder 8
3.1.2.2. Transponder ⇒ Read/Write Device 8
3.1.3. Interface 8
3.1.4. Metallic Environment, Interferences 9
3.1.5. Distance between Two Antennas 9
3.1.6. Temperature Range 9
3.2. Mechanical Specifications 10
3.2.1. Mechanical Dimensions 10
3.2.2. Pin Assignment 11
3.2.3. Pin Function Description 13
3.2.4. SubD Pin Description 13
3.2.5. Power supply connector 13
4. Description of the Reader Module Functions 14
4.1. Block Diagram 14
4.1.1. EEPROM 14
4.1.2. Micro Controller 14
4.1.3. Interface: Micro Controller - HOST 14
4.1.4. Line driver 14
4.1.5. Transmitter and Receiver 15
4.1.6. Antenna 15
4.1.7. Filtering of Power Supply 15
4.1.8. I/O Functions 15
5. Postal Approval 16
6. Connection of the Reader Module 17
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6.1. Building HITAG Proximity Antennas 17
6.1.1. Basics 17
6.1.2. Antenna Coil 18
6.1.3. Measuring the Inductance 19
6.1.4. Antenna Cable Length 19
6.1.5. Antenna Tuning 19
6.1.6. Determining the Serial Resistance of the Antenna 20
6.1.7. Checking the Antenna Voltage ÛL20
6.1.8. Procedure for Practical Antenna Design 21
6.1.9. Reference Antennas 23
6.2. Possible Sources of Errors by Connecting the HITAG Proximity Reader Module 24
7. Security Considerations 25
7.1. Operating Security 25
7.1.1. Anticollision Mode 25
7.1.2. Monitoring the Supply Voltage 25
7.1.3. Antenna Rupture, Antenna Short Circuit 25
7.2. Data Privacy 26
8. Ordering Information 27
Author : Ulrich Brändle
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Definitions
Data sheet status
Objective specificationThis data sheet contains target or goal specifications for product development.
Preliminary specificationThis data s heet contains preliminary data; s upplementary data may be
published later.
Product spec ification This data sheet c ontains final produc t spec ifications.
Limiting values
Limiting values giv en are in accordanc e with the Absolute Maximum Rating System (IEC 134).
Stress abov e one or more of the limiting values may caus e permanent damage to the device.
These are s tress ratings only and operation of the device at these or at any other c onditions
above those giv en in the Characteristics s ection of the specification is not implied. Expos ure to
limiting values for ex tended periods may affec t dev ice reliability.
Application information
Where application information is given, it is adv isory and does not form part of the specification.
Life support applications
These products are not designed for use in life support appliances, devices, or systems where
malfunction of these products can reasonably be expected to result in personal injury. Philips
Semiconductors´ customers using or selling these products for use in such applications do so on
their own risk and agree to fully indemnify Philips Semiconductors for any damages resulting from
such improper use or sale.
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1. Introduction
- is the name o f one of the universal and powerful product lines o f our 125 kHz family.
The contactless proximity read/write system that works with passive transponders is suitable for
variou s applications. Inductive co upling helps you to achieve reading rang es up t o 200 mm and the
use of cryptography guarantees highest data security.
The HITAG Proximity Reader Module provides you with a universal, cost-effective, small and
complete reader unit.
It enables communication with the transponders of the 125 kHz family, i.e. Mikron’s HITAG 1,
HITAG 2 and µEM(H400x) (Read Only) transponders in proximity applications, and the Philips
PCF793x family which underlines the particular universality of the reader.
Easy integration and application of the HITAG Proximity Reader Module is due to:
• small size
• uncomplicated interfaces
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2. System Overview
The fo llo wing d rawing sho ws t he H IT AG P ro ximit y Re ad er Mo dule as pa rt o f a co mple te Rad io
Frequency Identification (RFID) system.
2.1. Transponders
The HI TAG P ro ximit y Re ad er Mo dule can co mmunica te wit h Mik ro n’s H IT AG 1 a nd H IT AG 2
t ranspo nders as well as wit h furt her 125kHz t ranspo nder s as e.g. t he µEM(H400x) and t he Philips
PCF793x family. Y o u us e so ftw ar e co mma nd s t o sw it ch t h e d e vic e fr o m b ein g u s ed a s r e ad / wr it e
device for HITAG transponders to a read device for µEM(H400x) transponders or a read/write
device for the PCF793x and the other way round.
2.2. Host
The connection to the host (e.g.: µC or PC) is a serial interface on RS232 level (version
HT RM440/AIE) for data transmission. Optionally wired interface drivers for RS422 (version
HT RM440/BIE) and RS485 (version HT RM440/CIE) are integrated on the HITAG Proximity
Reader Module.
2.3. I/O - Functions
T wo line s of th e H ITA G P ro x imity Rea de r M od u le a re w ire d a s inpu ts from e . g. s w itc he s , tw o a s
outputs to drive LEDs.
On the read/write device space is reserved to connect three LEDs as well as to connect e.g. two
switches.
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2.4. Connecting the Antenna
There is space r eserved on t he HITAG Pro ximit y R ea d er M odu le for tun ing ca p ac ito rs to tu ne the
antenna in case there is no tuning capacity used on the antenna itself.
The antenna has to be mounted in the following way:
*) TX2 is used as GND
C is used for tuning the antenna. For more detailed information please see Chapter 6.1 (Building
HITAG Proximity Antennas).
2.5. Behaviour with Several Transponders
If several HITAG transponders arrive simultaneously within the communication field of the an-
tenna of a HITAG Proximity Reader Module, the "stronger" transponder (the nearer one) takes
over or - under special circumstances - no communication takes place. If the transponders arrive
into the field one after the other, communication is established with the first one, all the other
transponders are ignored.
Nevertheless it is possible to mute transponders, so that several HITAG transponders can be ac-
cessed sequentially.
T his e ns ur e s t ha t no t w o ( o r se ve r al) H I T AG t r a nsp o nd er s w ill eve r be p r o ce ss e d ( a bove a ll wr it-
ten to!) accidentally at the same time.
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3. Specifications
3.1. Electrical Specifications
3.1.1. Power Supply
Power Supply Supply Current
9 - 16 VDC 150 mA max.
3.1.2. Modulation
3.1.2.1. Read/Write Device ⇒ Transponder
Type of Modulation Modulation Ratio
amplitude shift keying (ASK) 100 %
That means the carrier is periodically blanked completely, the information is located in the inter-
vals between the pauses.
3.1.2.2. Transponder ⇒ Read/Write Device
Type of Modulation Modulation Ratio
amplitude shift keying (ASK) depending on the distance between
transponder and read/write device
3.1.3. Interface
An interface driver for RS232 (version HT RM440/AIE) is integrated on the HITAG Proximity
Reader Module.
Optionally drivers are RS422 (version HT RM440/BIE) and RS485 (version HT RM440/CIE)
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3.1.4. Metallic Environment, Interferences
The communication range is impaired by metallic environment and electromagnetic interferences
(e.g.: monitors, keyboards). Therefore, you should keep a distance of at least the antenna´s di-
ameter to metallic surfaces o r lo o ps as well as t o elect r omagnet ic inter fer ences. I f t his is no t po ssi-
ble, you have to take preventive measures such as using ferrites or shielding for transponder and
antenna.
3.1.5. Distance between Two Antennas
In o rder t o be able t o o perat e t wo syst ems side by side wit ho ut negat ive influence o n co mmunica-
tion ranges, you must place the antennas at a minimum distance of four times the antenna diame-
ter. If you place them at a closer distance be sure to use suitable shielding or synchronisation.
3.1.6. Temperature Range
-25° C to +85° C (operating)
-40° C to +85° C (storage)
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3.2. Mechanical Specifications
3.2.1. Mechanical Dimensions
T h e follo win g d ra win g (n ot to s c a le ) s h ows the ou te r d ime n s ion s of th e H ITA G P roximity R e a d er
Module with the six mounting holes, top view.
Section A-A
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3.2.2. Pin Assignment
The fo llowing drawing (no t t o scale) shows t he pin assignment of the HITAG Proximit y Reader
Module (top view).
The three spare places for antenna tuning are also shown in this drawing.
22.8mm
2.9mm
2.54mm
1
4
10
9
8
7
6
5
3
2
Interface
2.0mm
3 places
for tunin
g
capacitors
8.5mm2.54mm
11
12
13
Power suppl
y
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T he fo llo w ing t a ble s ho w s t h e p in a s sig nme nt o f the H I T AG Pr o ximit y R ea de r Mod ule , p in t yp e s
and functions:
Pin Number Pin Name Type Function
1 D1 Cathode PWR Connection of
2 D1 Anode OPower LED
3 D2 Cathode PWR Connection of
4 D2 Anode OLED Nr. 1
5 D3 Cathode PWR Connection of
6 D3 Anode OLED Nr. 2
7 SW1 a IConnection of
8 SW1 b GND Switch Nr. 1
9 SW2 a IConnection of
10 SW2 b GND Switch Nr. 2
11 RX IReceiver Input
12 TX1 OTransmitter
13 TX2 GND Antenna Ground
I input pin
O output pin
PWR power supply pin
GND power supply pin
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3.2.3. Pin Function Description
Pin 1-2 These pins can be used to connect a power LED.
Pin 3-6 These pins can be used to connect LEDs which are driven by t he out put
pins of the Core Module.
P7 - P10: These pins can be used as inputs for switches and are internally con-
nected to pins 17 and 18 (of the HITAG Core Module).
Pin 11: This antenna signal input has to be connect ed to the input line o f t he an-
tenna. (See also Chapter 2.3).
Pin 12: This antenna signal output has to be connected to the output line of the
antenna. (See also Chapter 2.3).
Pin 13: This pin is used as GND - pin. The GND - line of the antenna has to be
connected to this pin. (See also Chapter 2.3)
3.2.4. SubD Pin Description
Connecting the serial interface use the following pin description:
123456789
RS232 NC RxD TxD NC GND NC IC IC NC
RS485 NC A- A+ NC GND NC IC IC NC
RS422 NC A- A+ NC GND NC B+ B- NC
3.2.5. Power supply connector
The inner pin o f the DC-connector has t o be co nnected to positive volt age, the o u ter one has to be
connected to ground. The connection is fail save.
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4. Description of the Reader Module Functions
4.1. Block Diagram
Note: R2 has only to be used for antenna cable lengths of more than 500 mm.
4.1.1. EEPROM
The EEPROM is used to store non-volatile data such as personalization data, keys, passwords,
configurations and status information.
4.1.2. Micro Controller
The micr o co nt roller pro cesses the pro to col fo r the communication between the transponders and
the read/write unit. The interface signals are converted so that a HITAG 1, HITAG 2,
µEM(H400x) or Philips PCF793x transponder is able to process them and the outgoing signals
from the transponder are converted into interface-compatible signals.
The second essential micro controller function is its control function. The micro controller acti-
vates and deactivates the transmitter, switches the receiver between the modes for the different
transponders reception and selects the EEPROM.
4.1.3. Interface: Micro Controller - HOST
The device communicates with the host (processor, PC, ...) via a serial interface using a baud rate
of 9600 baud. Data transfer details are: 1 start bit, 8 data bits, 1 stop bit and no parity bit, the
Least Significant Bit is sent first.
4.1.4. Line driver
An RS232 interface driver is integrated on the HITAG Proximity Reader Module. Optionally an
RS422 or an RS485 interface driver is possible.
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4.1.5. Transmitter and Receiver
The transmitter receives data from the micro controller and modulates the carrier.
The receiver demodulat es t he received data and passes t hem on to the micro contro ller for furt her
processing.
4.1.6. Antenna
To the design of HITAG Proximity Antennas see Chapter 6.1.
4.1.7. Filtering of Power Supply
Disturbances on the supply pins may reduce the performance of the system. For that reason the
supply is filtered but also to limit t he spurio us emissio ns at t he supply connections caused by the
digital parts of the module.
4.1.8. I/O Functions
T wo line s of th e H ITA G P ro x imity Rea de r M od u le a re w ire d a s inpu ts from e . g. s w itc he s , tw o a s
outputs to drive LEDs.
On the read/write device space is reserved to connect LEDs as well as to connect e.g. two
switches.
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5. Postal Approval
The postal approval can only be granted for final products, not just for components like the
H I TAG P ro x imit y Re a de r Mod ule . B ut t h e r e ad / wr it e d ev ice is de sig ne d in a w a y t h at it is p o ss i-
ble to get the postal approvement for a device including the HITAG Proximity Reader Module.
Electromagnetic emissions comply with the guidelines in FTZ 17 TR 2100 and ETS 300 683,
electromagnetic immunity complies with the guidelines in ETS 300 683.
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6. Connection of the Reader Module
6.1. Building HITAG Proximity Antennas
The antenna is an important part in the data transmission process between read/write device and
t ransponder. Therefo re, you sho uld be part icularly careful when implement ing t he antenna in o rder
to achieve optimum results.
An essential aspect in dimensioning HITAG antennas is the ratio between the antenna diameter
and the diamete r of the tran sponder coil. Th is ratio should b e within the limit v alues 3 an d 1. If the
rat io is to o big or t oo small read/w rit e dist ances can decrease and difficult ies during dat a t ransmis-
sion may occur.
For applications in which the transponders are to be only read, you can also use antennas that di-
verge from above mentioned instruction.
6.1.1. Basics
The fo llowing blo ck diagram sho ws the general archit ect ure of a HITAG Pro ximity ant enna and
its connection to the HITAG Proximity Reader Module.
R
f=125kHz
AGND
HITAG Core Module Antenna
with Antenna E
q
uivalent Circuit
LL
RR
R
CC
ÎTX1
Rx
Û
Û
1
L
22
s
s
ss
out
When dev elopin g an antenn a, it is importan t to take into consideration the read/write device limits,
i.e. maximum antenna current and maximum voltage at the receiver input. Wit h an out put vo ltage
Ûout of about 2.5 Vp the following limits apply to the read/write device:
maximum antenna current: 100 mAp
maximum input voltage (at the receiver (ÛL)):32 Vp
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The resistance R1 (22 Ohm) in the blo ck dia gr am is u sed a s cur re nt limit er . I t pr o tect s t he o ut put
stage in the event of a possible short circuit in the antenna and is already integrated in the
read/write device. R2 (approx. 600 ... 1000 Ω) has only to be used for antenna cable lengths of
more than 500 mm.
6.1.2. Antenna Coil
The inductance of the coil should be between 350 and 500 µH.
The antenna quality factor should be approximately Q = 40.
Q2fL
RS
=⋅⋅⋅π
Is the Q factor to o high it must be reduced with an additional r esistor . I t is t he aim no t to need this
additional resistor but use a lower wire diameter of the coil.
The following formula describes the approximate calculation of the number of windings for a de-
sired inductance and antenna geometry:
L2aln
a
DKN
1.9
=⋅⋅ −
⋅
The abbreviations read as follows:
L ... desired inductance [nH]
a ... antenna circumference [cm]
D ... wire diameter [cm]
N ... number of windings
K ... geometrical constant
circular antenna : K=1.01
square antenna : K=1.47
Note: The factor K is normally much smaller than a/D and can be therefore left out:
NL
2aln(a/D)
1.9
≈⋅⋅
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6.1.3. Measuring the Inductance
The inductance of the coil designed following above listed instruct ions can be measured using the
following measuring set-up:
A sinus signal of 125 kHz is fed using a function generator. If you measure the current Î and the
antenna voltage Û L you can calculate the inductance according to the following formula:
LUI
L
=⋅
ω
ω = 2×p×f
6.1.4. Antenna Cable Length
For optimal performance the antenna cable length should not exceed 5 m.
6.1.5. Antenna Tuning
You have t o t une t he antenna in it s final form wit h t he co nnecting cable. You must not make any
changes to the antenna coil or the connecting cable after you finished tuning because mechanical
changes influence the electrical values and the antenna is detuned again.
A sinus signal of 125 kHz is fed to the antenna using a frequency generator. You measure the
voltages Û and ÛR with an oscilloscope. Then you change the frequency until Û and ÛR are in
phase. If the resonance frequency thus arrived at is too high, you have to increase CS, if it is t o o
low, you have to decrease CS.
The aim is to arrive at a resonance frequency of 125 kHz using CS.
Tune the antenna to a frequency of 125kHz ± 4kHz.
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6.1.6. Determining the Serial Resistance of the Antenna
Use an oscilloscope to measure ÛA and ÛR at a frequency of 125 kHz.
You can calculate the serial resistance RS with the following formula:
ÎÛ
RR
=3
ÞRÛ
Î
sA
=
6.1.7. Checking the Antenna Voltage ÛL
Before connecting the antenna to the read/write device as shown in the illustration below, you
must carry out a check calculat ion o f the input level o f the read/write device acco rding to the for-
mulas further down in order to prevent damage.
ÎÛ
RRR
out
se
=++
1()
Ûout ≈ 2.5 Vp Û
L = L ⋅ ω ⋅ Î ω = 2 π f (f = 125 kHz)
The maximum value for ÛL reads 32 Vp , safeguarding against damage to the input level of the
read/write device.
With ÛL < 32 Vp the resistance Re can be omitted
With ÛL > 32 Vp you have to calculate and insert Re according to the following formula:
RL Û
ÛRR
eout
Ls
=⋅⋅ − −
ω
max 1ÞRL R
es
≥⋅ ⋅ − −
ω
0 078 22,
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6.1.8. Procedure for Practical Antenna Design
The procedure ho w t o design a HITAG Proximit y ant enna is described in t he previous chapt ers.
The main steps are the following:
1. The desired inductance for the antenna coil can be chosen in a range between 350 and
500 µH, e.g. L = 420 µH).
2. The number of windings N can be calculated with the following formula:
NL [nH ]
2 a ln(a / D) - K
1.9
=⋅⋅
for L = 420 µH:
N420 000
2aln(a/D) - K
1. 9
=⋅⋅ = 633
aln(a/D)
1.9 ⋅
Note: The factor K (see also Chapter 6.1.2.) normally is much smaller than a/D and can be
therefore left out.
3. Now the antenna can be built up with the desired dimensions (⇒ circumference a) with
the calculated number of turns.
Note: The antenna coil must not be changed afterwards because with the mechanical
dimensions the electrical specifications are changing too. That means the number of
turns, the shape, arrangement of the coil windings and antenna supply cable must be in
their final form.
Note: Metal influences the electrical characteristics of the antenna very much. That is why
all future tasks have to be done with the antenna in its final environment if metal will
be in the antenna´s neighbourhoud (distance of the metal < maximum antenna
diameter).
4. Measurement of the inductance L of the antenna is described in Chapter 6.1.3.
5. Determination of the serial capacitor CS is described in Chapter 6.1.5.
Note: The capacitance of the antenna supply cable can be measured or found out in the data
sheet of the cable (e.g. Cp = 180 pF/m).
6. Now the antenna has to be tuned according to Chapter 6.1.5.
The tuning is acceptable if the resonce frequency is within a range of 125kHz ± 4kHz.
7. The serial resistance RS of the antenna is the impedance of the tuned antenna and is an
ohmic resistance at the resonance frequency (f = 125 kHz). It can be calculated as shown
in Chapter 6.1.6.
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8. To get a satisfactory reading distance the quality factor of the antenna coil (for non-metal
environment) should be about Q = 40. The quality factor of a coil is calculated as
follows:
QL
R2fL
R
SS
=⋅=⋅⋅⋅ωπ
9. By knowing RS and the dropping resistor (R1 = 22 Ω) it is possible to calculate the
current Î and the antenna voltage ÛL.
It is very important to calculate the antenna voltage before connecting the antenna to the
HITAG Proximity Reader Module to avoid damage. Is the calculated value of ÛL higher
than ÛL = 32 Vp a resist or Re has to be integrated to protect the module output circuit. The
resistor has to be placed as shown in Chapter 6.1.7.
10. After checking the antenna voltage as described in point 9. connect your antenna to the
HITAG Proximity Reader Module and measure the read/write distances with your
transponders.
If the read/write distances do not fulfill your expectations, the following points should be
considered:
•The size of the antenna and the size of the transponder have to be in a defined ratio
(between 3 and 1).
That means, if you increase the antenna over a certain size, the maximum read/write
distances will decrease by the use of the same transponder.
•The optimal shape of the antenna coil is a circle. The performance of a square shaped
coil is much better than that of a rectangular shaped coil (with the same
circumference).
•To get better read/write distances the quality factor of the antenna coil should be
increased, but it must not be higher than Q = 40. This can be reached by the following
measures:
- All conducting material has to be removed from the antenna environment.
- A thicker wire can be used for the coil.
- Ferrite can be placed behind the antenna coil to concentrate the field.
- Extension of the antenna area.
- There can be better results by trying another number of turns.
Attention: All these measures must not differ from the antenna design instructions of
Chapter 6.1.
Note: With additional dropping resistor R1 and resistor Re the quality factor of the whole
antenna system is about Q = 15.
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6.1.9. Reference Antennas
Designing an antenna in the way described in this chapter you could use the following values:
·∅ 0.4 mm Cu - laqueur wire
· 35 turns
· Diameter of the turns (internal): 145 mm
· Tuning frequency: 125 kHz
· Tuning Capacity depending on: - length of the antenna cable
- exact way of winding
This antenna is best suitable for HITAG. In this performance reading distances of about 140 mm
for cards and 130 mm for discs should be achieved.
A further antenna configuration is:
·∅ 0.224 mm Cu - laqueur wire
· 52 turns
· Diameter of the turns (internal): 65 mm
· Tuning frequency: 125 kHz
· Tuning Capacity depending on: - length of the antenna cable
- exact way of winding
In this case cards and coins can be used and the following approximate communication distances
should be achieved:
read distance with HITAG 1 and HITAG 2 card: 105 mm
read distance with HITAG 1 and HITAG 2 coin: 65 mm
The third antenna configuration is the smallest one:
·∅ 0.224 mm Cu - laqueur wire
· 85 turns
· Diameter of the turns (internal): 35 mm
· Tuning frequency: 125 kHz
· Tuning Capacity depending on: - length of the antenna cable
- exact way of winding
Using this antenna coins and pills can be operated up to the following approximate distances:
read distance with HITAG 1 coin: 50 mm
read distance with HITAG 1 pill: 28 mm
All distances are given in free air at room temperature.
Specifications subject to change without notice.
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6.2. Possible Sources of Errors by Connecting the HITAG
Proximity Reader Module
The fo llo wing erro r list should be checked if any er ror (e. g. read/writ e dist ances t hat do not reach
the specified values) occurs:
•Power supply cable not mounted correctly.
•Power supply not in the specified range (U = 9 - 16VDC)
•Serial interface not connected correctly.
•Interference received by the antenna because of an external noise source (e.g. monitor,
keyboards).
Remedial measure: Removal of the antenna from the interfering area.
•Connecting cables of the antenna changed by mistake.
•Antenna is mounted in metal environment.
Remedial measure: Mount a non-metal space keeper between the antenna and the metal.
•Antenna is not designed following the design instructions of Chapter 6.
•Inductance of the antenna is too high.
•Quality factor of the antenna is too high (> 40).
•Antenna current is too high.
•Antenna voltage is too high.
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7. Security Considerations
Developing the HITAG Proximity Reader Module special consideration was given to aspects of
security. The following items represent the fundamental framework of the security concept:
• cryptography
• mutual authentication
• password verification and
• Cyclic Redundancy Check (CRC)
7.1. Operating Security
The following mechanisms ensure the operation security of the HITAG system.
7.1.1. Anticollision Mode
Anticollision Mode in Long Range applications permits you to process several transponders si-
multaneously. Theoretically up to 232 transponders can be processed simultanously. In practice
this number is limited, because of the mutual influence of the transponders - they detune each
other, if there are too many too close to each other.
I n p r o ximit y a p plic atio ns us ing HI T AG 1 o r HI T AG 2 t r a ns pond e r s, o n ly o ne t r a ns po nd er is ha n-
dled even if there are several transponders within the communication field of the antenna. In this
case either no communication takes place or the "stronger" or closer transponder takes over.
By muting a selected transponder (HALT Mode) another transponder that is to be found in the
communication field of the antenna can be recognized.
7.1.2. Monitoring the Supply Voltage
Supply voltage is controlled by a watch dog circuit which triggers a system reset if the supply
voltage drops below 4.75 V or if the micro controller fails.
7.1.3. Antenna Rupture, Antenna Short Circuit
The HITAG Proximity Reader Module does no t get permanently damaged in case o f an ant enna
rupture or a brief antenna short circuit.
Proximity Reader Module HT RM440 Rev. 2.0 November 1996
Htrm440.doc/HS Page 26 of 27
7.2. Data Privacy
The use of cryptography (Stream Cypher), mutual authentication, and password verification pre-
vents monitoring and copying the data channel. Therefore, the area of the transponder that only
can be accessed enciphered is called “secret area“.
To make use of cryptography for HITAG 1 transponders you need keys and logdata.
Keys are used to initialise the crypto block
and logdata are used for mutual authentication.
To make use of cryptography for HITAG 2 transponders you need a key and passwords.
The Key is used to initialise the crypto block using HITAG 2 in Crypto Mode
and passwords are used for authentication for HITAG 2 in Password Mode.
T he t r a ns po nd er s an d t he HI T AG P r o ximity Re ad er Mo d u le a r e p r o vid ed w it h id ent ic a l t r a ns po r t
keys and transport logdata so that you can start operating them right away.
The KeyInit Password is set to 0x00000000, HITAG 1 Keys and Logdat a are set to 0x00000000,
HITAG 2 Key is set to 0x4D494B524F4E, HI T AG 2 Passwor d T AG to 0xAA4854 and HI T AG 2
Password RWD to 0x4D494B52 by Philips Semiconductors (predefined transport values).
In order to offer our OEM clients high flexibility, the configuration of the transponder memory,
password, keys and logdata can be changed.
We st rict ly reco mmend to rigoro usly rest rict these possibilities fo r the end custo mers (by sett ing
the configuration page to read only, setting password, keys and logdata to neither read nor write).
November 1996 Rev. 2.0 Proximity Reader Module HT RM440
Page 27 of 27 Htrm440.doc/HS
8. Ordering Information
Type Name Description Ordering Number
HT RM440/AIE H I T A G Pr o x i mit y R eader Module,
Interface RS232 9352 338 70122
HT RM440/BIE H I T A G Pr o x i mit y R eader Module,
Interface RS422 9352 338 80122
HT RM440/CIE H I T A G P r o xi m i t y R eader M odule,
Interface RS485 9352 338 90122
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