MRD2 – LF Reader Module
The Microreader MRD2 is a reader module with advanced features that is backward compatible with the MRD1 module. It features new protocols and commands to communicate with TI Low Frequency (LF) half-duplex (HDX) transponders for programming and tuning. In addition to the dual in line (DIL) module size, which is compatible with the MRD1, the reader is also available in a smaller surface-mount device (SMD) module SMD-MRD2. Both modules can be used as direct drop-in replacements for the MRD1.
The Microreader module is available as a DIL module or a SMD module that can be plugged into or soldered onto an application-specific adapter board. The Microreader supports serial and USB data communications between a PC and transponders. The Microreader supports TTL data communications through its serial communications interface (SCI), which allows communication to a standard interface when using an additional communications driver (for example, RS232 or RS422). In addition, a USB interface is available and requires only a few external components. For easy access to the USB port from the PC side, the reader is managed as a COM port. The Microreader can be controlled remotely either by providing certain inputs with the corresponding voltage level or by sending commands to the SCI or USB. The Microreader can be driven either with or without synchronization. Synchronization can be either wireless or wired to enable reliable operation in multi-reader environments. Two outputs show the reader status and inform the user about a successful command execution. The Microreader supports all available TI LF HDX transponders. The supply voltage can vary between 2.7 V and 5.5 V. A voltage regulator and level shifters are implemented to maintain the specified supply range. A micro controller generates the transmit signal, demodulates the receive signal, and manages the two host interfaces.