Instructions
Operation
a) Pin assignment on the connection cable
The three inner wires of the connection cable are color coded and assigned as follows:
blue supply voltage 0V (GND)
red supply voltage 3.3 – 5 V (VCC)
yellow serial data output
Important notice: High frequency noise (ripple) on the power supply can reduce the reading
range of the antenna.
b) Principle of operation
The RFID antenna will start generating a 125kHz electromagnetic eld immediately after
applying power to the unit. Transponders getting within reading range of the antenna will be
automatically detected and read.
Upon reading the 64 bit signature of the transponder the data integrity is validated by checking
the header and parity bits.
If all checksum information is found correct the 40 bit of the serial number information are
transmitted as 5 byte string via the serial interface.
The serial interface works according to common standard but for reference the details will be
explained here:
- The serial data transmission uses a bitrate of 9600 bits per second which is equal to 104µS
per bit.
- Each byte transmission is started with a start bit at low level. (0V)
- Following the start bit 8 data bits are sent with the least signicant bit (LSB) transmitted rst.
A logical ‘1’ is represented with high level (VCC), a logical ‘0’ with low level (0V)
- Each byte transmitted ends with a stop bit at high level (VCC) 5 Bytes are transmitted in
a straight sequence.
- If the transponder remains within reading range of the Antenna, the ID data will be sent
continuously at a rate of approximately 5 times per second. The transmission will only end
after the transponder has been removed from the reading range.
A detailed description of the raw data format of the transponders and transponder technology
in general can be found in datasheets for the EM4102 transponder easily found with internet
research.
The polarity of the serial data transmission using TTL levels is reversed in
comparison with the RS-232 levels used for PC data transmission. For transmitting
the RFID-ID data from the antenna to a PC it is necessary to use an inverting level
converter such as for example MAX232.
Disposal
Electronic devices are recyclable waste and must not be disposed of in the
household waste. At the end of its service life, dispose of the product in accordance
with applicable regulatory guidelines.
Remove any inserted (rechargeable) batteries and dispose of them separately from
the product.
Technical Data
Dimensions of the antenna ........... 50 x 50 x 5mm, 1.5 m cable length
Power requirements ..................... 3.3 – 5 V/DC max. 20 mA
data interface ................................ seriell TTL, 9600 bps / 8 N1
ambient temperature .................... 0°C to 40°C (non-condensing)
RFID frequency ............................ 125 kHz
transponder compatibility .............. Basetech transponders
EM410x compatible ROM transponders
Operating Instructions
Universal RFID-Antennafor C-Control
Item No. 1839716
Intended use
The universal RFID antenna detects and reads the ROM ID- Signature of passive transponders.
The decoded and validated data is transmitted via a TTL compatible serial interface for easy
processing by another data processing system.
Contact with moisture must be avoided under all circumstances.
For safety and approval purposes, you must not rebuild and/or modify this product. If you use
the product for purposes other than those described above, the product may be damaged. In
addition, improper use can result in short circuits, res, electric shocks or other hazards. Read
the instructions carefully and store them in a safe place. Make this product available to third
parties only together with its operating instructions.
This product complies with the statutory national and European requirements.
All company names and product names are trademarks of their respective owners. All rights
reserved.
Special features of the RFID-Antenna
• Compatible with Basetech and EM410x ROM transponders (64/40 Bit).
• Compact size.
• Low power consumption.
• Cost efcient and reliable RFID reader for many applications.
Up-to-date Operating Instructions
Download the latest operating instructions at www.conrad.com/downloads or
scan the QR code shown. Follow the instructions on the website.
Explanation of symbols
The symbol with the lightning in the triangle is used if there is a risk to your health,
e.g. due to an electric shock.
The symbol with the exclamation mark in the triangle is used to indicate important
information in these operating instructions. Always read this information carefully.
Safety instructions
Read the operating instructions carefully and especially observe the safety
information. If you do not follow the safety instructions and information on
proper handling in this manual, we assume no liability for any resulting
personal injury or damage to property. Such cases will invalidate the warranty/
guarantee.
• The handling of products operating with electric current requires you to follow the
rules from VDE such as VDE 0100, VDE0550/0551, VDE 0700, VDE 0711 and
VDE 0860 or other local rules in your country.
• These modules are not designed and authorized for use in life support or life
saving applications! Do not use the product for applications in which a temporary
or permanent failure or malfunction could cause damage to persons or property.
• If the module is used to switch currents greater 24V it is necessary to have the
installation done with no voltage applied and performed by a trained professional
authorized for such work. The module may only be used in such application if it
was installed in a safe to touch enclosure.
• The module must only be used in dry and clean environment. The use near water,
heavy dirt and/or high humidity is dangerous and not permitted.
• The product must not be used in conjunction with any type of ammable liquid or
gas or other environment with risk of spark triggered explosions.
• Never exceed the limits or ratings listed in the “Technical Data” section at the end
of this user guide.
• If the module is used in schools or educational facilities or similar institutions the
operation must be supervised by trained and authorized staff.
• The product itself and all parts thereof (including packing material) are not suitable
toys for children! (choking hazard, risk of electric shock, ...)
This is a publication by Conrad Electronic SE, Klaus-Conrad-Str. 1, D-92240 Hirschau (www.conrad.com). All rights
including translation reserved. Reproduction by any method, e.g. photocopy, microlming, or the capture in electronic data
processing systems require the prior written approval by the editor. Reprinting, also in part, is prohibited. This publication
represent the technical status at the time of printing.
Copyright 2018 by Conrad Electronic SE. *1839716_v1_1018_02_dh_m_de_en