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EM Marin RFID Products |
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| EM Marin RFID Receiver Module | ||
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| Documentation | ||
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| The RWD-EM4102 is a complete RFID reader and tag acceptance solution. The EM Marin protocol is a standard developed by Philips Semiconductor, the reader will support any RFID tags using this protocol including our CARD-EM4102 transponder card. Also a wide variety of tag types are available which support this protocol from Sokymat. The RWD-EM4102 version is a complete RFID reader and tag acceptance solution for EM Marin derived RF transponders. The RFID receiver only needs a 700uH antenna coil connected and 5v DC supply to be a fully featured reader system. The module provides internal EEPROM memory for holding lists of authorised identity codes, a manual override switch facility and has LED drives to give visual indication of acceptance. The RWD also has a TTL level RS232 interface that allows system features to be customised, configurations changed and data read from the tag to be handled by the host system. The EM Marin based transponders provide 64 bits of read-only memory. This memory contains a header bit sequence and 40 bits (5 bytes) of user data interspersed with parity bits. Data is only accepted from the transponder if the memory parity bits are valid. This configuration ensures that the integrity of user data is maintained. The EM Marin transponder type is widely used throughout the world in its base form and also in many fully compatible derivative forms. The MicroRWD is essentially a proximity system and a Read range of up to 20cm can be achieved with the same level of reliable communication and EMC resilience. The unique AST (Adaptive Sampling) feature allows the RWD to continually adjust and retune the sampling to allow for inductive changes in the RF field, an essential feature for real-world reliability and robust operation. The communication protocol with the tags can achieve 2k bits/second of data transfer and the total time to read the 40 bit data is less than 40ms. The MicroRWD can be easily integrated into almost any application; when power (5v DC) is first applied to the board the red and green LEDs flash once to indicate successful power-up. The device can also check for broken or shorted antenna and can even detect very badly tuned antennas; these problems are indicated by the red LED flashing continuously until the fault has been rectified. The MicroRWD will normally have the red LED lit until a valid card or tag is brought into the RF field. If the tag is accepted as valid then the green LED is lit and the output drivers (OP0, OP1, OP2, OP3) are switched on. These outputs can be connected together to give up to 100ma of drive current for operating a relay etc. In addition, a switch input is provided for overriding the tag reading operation and switching the output drives directly. Technical documentation is available on these products from the IB Technology Website. |
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