RF Modules :
The Etel protocols are standards developed by Philips
Semiconductor, the reader will support any RFID tags using this protocol including
our CARD-H1S transponder card. The RFID receiver only needs a 700uH antenna
coil connected and 5v DC supply to be a fully featured read/write 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 a host
system to communicate with the RWD if necessary, so that system features can be
customised, configurations changed and tag read/write data handled by the host
system. The RWD module is essentially a proximity system and a Read/Write 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 4k bits/second of data transfer and
the total time to read a 32 bit page, including reading of the serial number, selecting
the tag and the read operation takes less than 100ms. The RWD module can be
easily integrated into almost any application; when power 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 module will normally have the red LED lit until a valid
card or tag is brought into the RF field. In addition, a switch input is provided for
overriding the tag reading operation and switching the output drives directly. |
Products : - Component Distribution 
