I use this RFID module to a Raspberry Pi. The antenna is connected via a small two-pin connector directly to the module. There is also a direct output for an LED at the bottom right, indicating the reading status. To this end, the LED labeled with pin must be connected via a series resistor to GND. The 5-pins at upper right corner allow you to connect the power source can be connected (via + 5V [pin2] / GND [Pin6] directly from the RPI) and the RXD [Pin10]. This must be observed, install a voltage divider. For this purpose, it is enough to go on a 10K resistor from the TX pin of the module. From there branch off on pin 10 of the RPi and another 10K resistor to GND. The 2.5V, which then arrive on the RPi are entirely sufficient. The appropriate Python script can be found on the Internet for download.
